SEC Info - SG Blocks, Inc. - ‘10-K’ for 12/31/20

SEC Info℠

Home

My Interests

Help

Please Sign In

SG Blocks, Inc. – ‘10-K’ for 12/31/20 – ‘EX-101.DEF’

On: Thursday, 4/15/21, at 4:38pm ET · For: 12/31/20 · Accession #: 1213900-21-21736 · File #: 1-38037

Previous ‘10-K’: ‘10-K/A’ on 4/15/20 for 12/31/19 · Next: ‘10-K/A’ on 4/30/21 for 12/31/20 · Latest: ‘10-K/A’ on 5/10/24 for 12/31/23 · 43 References:

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 4/15/21  SG Blocks, Inc.                   10-K       12/31/20   91:9.8M                                   EdgarAgents LLC/FA

Annual Report — Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.34M 
 7: EX-4.13     Description of Securities                           HTML     35K 
 8: EX-21.1     List of Subsidiaries                                HTML     23K 
 9: EX-23.1     Consent of Independent Registered Public            HTML     22K 
                Accounting Firm                                                  
10: EX-31.1     Certification -- §302 - SOA'02                      HTML     29K 
11: EX-31.2     Certification -- §302 - SOA'02                      HTML     29K 
12: EX-32.1     Certification -- §906 - SOA'02                      HTML     26K 
14: R1          Document and Entity Information                     HTML     84K 
15: R2          Consolidated Balance Sheets                         HTML    119K 
16: R3          Consolidated Balance Sheets (Parenthetical)         HTML     39K 
17: R4          Consolidated Statements of Operations               HTML    110K 
18: R5          Consolidated Statements of Changes in               HTML     66K 
                Stockholders' Equity                                             
19: R6          Consolidated Statements of Cash Flows               HTML    133K 
20: R7          Description of Business                             HTML     35K 
21: R8          Liquidity                                           HTML     39K 
22: R9          Summary of Significant Accounting Policies          HTML    129K 
23: R10         Accounts Receivable                                 HTML     43K 
24: R11         Contract Assets and Contract Liabilities            HTML     45K 
25: R12         Property, Plant and Equipment                       HTML     40K 
26: R13         Notes Receivable                                    HTML     29K 
27: R14         Notes Payable                                       HTML     26K 
28: R15         Business Combination                                HTML     44K 
29: R16         Leases                                              HTML     53K 
30: R17         Convertible Debentures                              HTML     33K 
31: R18         Income Taxes                                        HTML     90K 
32: R19         Net Income (Loss) Per Share                         HTML     27K 
33: R20         Construction Backlog                                HTML     45K 
34: R21         Stockholders' Equity                                HTML     38K 
35: R22         Warrants                                            HTML     34K 
36: R23         Share-based Compensation                            HTML    117K 
37: R24         Commitments and Contingencies                       HTML     57K 
38: R25         Subsequent Events                                   HTML     28K 
39: R26         Summary of Significant Accounting Policies          HTML    180K 
                (Policies)                                                       
40: R27         Liquidity (Tables)                                  HTML     30K 
41: R28         Summary of Significant Accounting Policies          HTML     64K 
                (Tables)                                                         
42: R29         Accounts Receivable (Tables)                        HTML     42K 
43: R30         Contract Assets and Contract Liabilities (Tables)   HTML     43K 
44: R31         Property, Plant and Equipment (Tables)              HTML     38K 
45: R32         Business Combination (Tables)                       HTML     40K 
46: R33         Leases (Tables)                                     HTML     46K 
47: R34         Income Taxes (Tables)                               HTML     86K 
48: R35         Construction Backlog (Tables)                       HTML     43K 
49: R36         Share-based Compensation (Tables)                   HTML     99K 
50: R37         Description of Business (Details)                   HTML     31K 
51: R38         Liquidity (Details)                                 HTML     30K 
52: R39         Liquidity (Details Textual)                         HTML     30K 
53: R40         Summary of Significant Accounting Policies          HTML     57K 
                (Details)                                                        
54: R41         Summary of Significant Accounting Policies          HTML     38K 
                (Details 1)                                                      
55: R42         Summary of Significant Accounting Policies          HTML     25K 
                (Details 2)                                                      
56: R43         Summary of Significant Accounting Policies          HTML    152K 
                (Details Textual)                                                
57: R44         Accounts Receivable (Details)                       HTML     41K 
58: R45         Accounts Receivable (Details Textual)               HTML     27K 
59: R46         Contract Assets and Contract Liabilities (Details)  HTML     31K 
60: R47         Contract Assets and Contract Liabilities (Details   HTML     29K 
                1)                                                               
61: R48         Property, Plant and Equipment (Details)             HTML     45K 
62: R49         Property, Plant and Equipment (Details Textual)     HTML     24K 
63: R50         Notes Receivable (Details)                          HTML     41K 
64: R51         Notes Payable (Details)                             HTML     45K 
65: R52         Business Combination (Details)                      HTML     31K 
66: R53         Business Combination (Details 1)                    HTML     51K 
67: R54         Business Combination (Detail Textual)               HTML     26K 
68: R55         Leases (Details)                                    HTML     43K 
69: R56         Leases (Details 1)                                  HTML     74K 
70: R57         Leases (Details Textual)                            HTML     27K 
71: R58         Convertible Debentures (Details Textual)            HTML     52K 
72: R59         Income Taxes (Details)                              HTML     38K 
73: R60         Income Taxes (Details 1)                            HTML     37K 
74: R61         Income Taxes (Details 2)                            HTML     44K 
75: R62         Income Taxes (Details Textual)                      HTML     39K 
76: R63         Net Income (Loss) Per Share (Details)               HTML     30K 
77: R64         Construction Backlog (Details)                      HTML     31K 
78: R65         Construction Backlog (Details 1)                    HTML     31K 
79: R66         Construction Backlog (Details Textual)              HTML     40K 
80: R67         Stockholders' Equity (Details)                      HTML     81K 
81: R68         Warrants (Details)                                  HTML     48K 
82: R69         Share-based Compensation (Details)                  HTML     35K 
83: R70         Share-based Compensation (Details 2)                HTML     73K 
84: R71         Share-based Compensation (Details 3)                HTML     33K 
85: R72         Share-based Compensation (Details Textual)          HTML    112K 
86: R73         Commitments and Contingencies (Details)             HTML     37K 
87: R74         Subsequent Event (Details)                          HTML     34K 
89: XML         IDEA XML File -- Filing Summary                      XML    162K 
13: XML         XBRL Instance -- sgbx-20201231_htm                   XML   1.84M 
88: EXCEL       IDEA Workbook of Financial Reports                  XLSX    118K 
 3: EX-101.CAL  XBRL Calculations -- sgbx-20201231_cal               XML    267K 
 4: EX-101.DEF  XBRL Definitions -- sgbx-20201231_def                XML    939K 
 5: EX-101.LAB  XBRL Labels -- sgbx-20201231_lab                     XML   3.11M 
 6: EX-101.PRE  XBRL Presentations -- sgbx-20201231_pre              XML   1.55M 
 2: EX-101.SCH  XBRL Schema -- sgbx-20201231                         XSD    272K 
90: JSON        XBRL Instance as JSON Data -- MetaLinks              496±   681K 
91: ZIP         XBRL Zipped Folder -- 0001213900-21-021736-xbrl      Zip    371K

‘EX-101.DEF’ — XBRL Definitions — sgbx-20201231_def

This Exhibit is an XBRL XML File.

<?xml version="1.0" standalone="yes" encoding="windows-1252"?>

<link:linkbase xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>

<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SubsequentEventDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SubsequentEventDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Constructionbacklogdetailstextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Constructionbacklogdetailstextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LiquidityTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LiquidityTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/PropertyPlantandEquipmentDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#PropertyPlantandEquipmentDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Disclosure-ConvertibleDebenturesDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Disclosure-ConvertibleDebenturesDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxesDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxesDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DebtorinPossessionFinancingDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DebtorinPossessionFinancingDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConvertibleDebenturesDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConvertibleDebenturesDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/WarrantsDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#WarrantsDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConvertibleDebenturesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConvertibleDebenturesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/PropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#PropertyPlantandEquipmentDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/AccountsReceivableDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#AccountsReceivableDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationDetails2" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationDetails2"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails2" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesDetails2"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/StockholdersEquityDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#StockholdersEquityDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConstructionBacklogDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConstructionBacklogDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConsolidatedStatementsOfOperations" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConsolidatedStatementsOfOperations"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LiquidityDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LiquidityDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationDetails3" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationDetails3"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DescriptionofBusinessDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DescriptionofBusinessDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryOfSignificantAccountingPoliciesDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryOfSignificantAccountingPoliciesDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConsolidatedStatementsOfChangesInStockholdersEquity"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NetIncomeLossPerShareDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NetIncomeLossPerShareDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#CommitmentsandContingenciesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NotesPayableDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NotesPayableDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NotesReceivableDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NotesReceivableDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConstructionBacklogTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConstructionBacklogTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DocumentAndEntityInformation"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConsolidatedBalanceSheets"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConsolidatedBalanceSheetsParenthetical"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Consolidatedstatementsofcashflows" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Consolidatedstatementsofcashflows"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DescriptionOfBusiness" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DescriptionOfBusiness"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Liquidity" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Liquidity"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/EmergenceFromBankruptcy" xlink:type="simple" xlink:href="sgbx-20201231.xsd#EmergenceFromBankruptcy"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryOfSignificantAccountingPolicies"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/AccountsReceivable" xlink:type="simple" xlink:href="sgbx-20201231.xsd#AccountsReceivable"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ContractAssetsandContractLiabilities" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ContractAssetsandContractLiabilities"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/PropertyPlantandEquipment" xlink:type="simple" xlink:href="sgbx-20201231.xsd#PropertyPlantandEquipment"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NotesReceivable" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NotesReceivable"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NotesPayable" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NotesPayable"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/BusinessCombination" xlink:type="simple" xlink:href="sgbx-20201231.xsd#BusinessCombination"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Leases" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Leases"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Inventory" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Inventory"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConvertibleDebentures" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConvertibleDebentures"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DebtorInPossessionFinancing" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DebtorInPossessionFinancing"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxes" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxes"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NetIncomeLossPerShare" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NetIncomeLossPerShare"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConstructionBacklog" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConstructionBacklog"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/StockholdersEquity" xlink:type="simple" xlink:href="sgbx-20201231.xsd#StockholdersEquity"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/Warrants" xlink:type="simple" xlink:href="sgbx-20201231.xsd#Warrants"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensation" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensation"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/DocumentCommitmentsandContingencies" xlink:type="simple" xlink:href="sgbx-20201231.xsd#DocumentCommitmentsandContingencies"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SubsequentEvents" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SubsequentEvents"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/EmergenceFromBankruptcyTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#EmergenceFromBankruptcyTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/AccountsReceivableTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#AccountsReceivableTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ContractAssetsandContractLiabilitiesTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/InventoryTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#InventoryTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/PropertyPlantandEquipmentTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#PropertyPlantandEquipmentTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/BusinessCombinationTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#BusinessCombinationTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LeasesTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LeasesTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConvertibleDebenturesTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConvertibleDebenturesTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxesTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/NetIncomeLossPerShareTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#NetIncomeLossPerShareTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SharebasedCompensationTables" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SharebasedCompensationTables"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LiquidityDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LiquidityDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/EmergencefromBankruptcyDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#EmergencefromBankruptcyDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails3" xlink:type="simple" xlink:href="sgbx-20201231.xsd#SummaryofSignificantAccountingPoliciesDetails3"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/AccountsReceivableDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#AccountsReceivableDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ContractAssetsandContractLiabilitiesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ContractAssetsandContractLiabilitiesDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/InventoryDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#InventoryDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/BusinessCombinationDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#BusinessCombinationDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/BusinessCombinationDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#BusinessCombinationDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/BusinessCombinationDetailTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#BusinessCombinationDetailTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LeasesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LeasesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LeasesDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LeasesDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/LeasesDetailsTextual" xlink:type="simple" xlink:href="sgbx-20201231.xsd#LeasesDetailsTextual"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxesDetails"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxesDetails1" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxesDetails1"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/IncomeTaxesDetails2" xlink:type="simple" xlink:href="sgbx-20201231.xsd#IncomeTaxesDetails2"/>

<link:roleRef roleURI="http://www.sgblocks.com/role/ConstructionBacklogDetails" xlink:type="simple" xlink:href="sgbx-20201231.xsd#ConstructionBacklogDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationDetailsTextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:label="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:title="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:label="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:title="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:to="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:title="Definition : us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems to us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" xlink:title="us-gaap_PlanNameAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:to="us-gaap_PlanNameAxis" xlink:title="Definition : us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable to us-gaap_PlanNameAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain" xlink:title="us-gaap_PlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameDomain" xlink:title="Definition : us-gaap_PlanNameAxis to us-gaap_PlanNameDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_TwoThousandSixteenPlanMember" xlink:label="sgbx_TwoThousandSixteenPlanMember" xlink:title="sgbx_TwoThousandSixteenPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanNameDomain" xlink:to="sgbx_TwoThousandSixteenPlanMember" xlink:title="Definition : us-gaap_PlanNameDomain to sgbx_TwoThousandSixteenPlanMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_TwoThousandSixteenPlanOneMember" xlink:label="sgbx_TwoThousandSixteenPlanOneMember" xlink:title="sgbx_TwoThousandSixteenPlanOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanNameDomain" xlink:to="sgbx_TwoThousandSixteenPlanOneMember" xlink:title="Definition : us-gaap_PlanNameDomain to sgbx_TwoThousandSixteenPlanOneMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameDomain_1" xlink:title="Definition : us-gaap_PlanNameAxis to us-gaap_PlanNameDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" xlink:title="srt_TitleOfIndividualAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:to="srt_TitleOfIndividualAxis" xlink:title="Definition : us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable to srt_TitleOfIndividualAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:title="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:title="Definition : srt_TitleOfIndividualAxis to srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ChiefExecutiveOfficerMember" xlink:label="srt_ChiefExecutiveOfficerMember" xlink:title="srt_ChiefExecutiveOfficerMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_ChiefExecutiveOfficerMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to srt_ChiefExecutiveOfficerMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ChiefFinancialOfficerMember" xlink:label="srt_ChiefFinancialOfficerMember" xlink:title="srt_ChiefFinancialOfficerMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_ChiefFinancialOfficerMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to srt_ChiefFinancialOfficerMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ChiefOperatingOfficerMember" xlink:label="srt_ChiefOperatingOfficerMember" xlink:title="srt_ChiefOperatingOfficerMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_ChiefOperatingOfficerMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to srt_ChiefOperatingOfficerMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_DirectorMember" xlink:label="srt_DirectorMember" xlink:title="srt_DirectorMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_DirectorMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to srt_DirectorMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EmployeeMember" xlink:label="sgbx_EmployeeMember" xlink:title="sgbx_EmployeeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_EmployeeMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_EmployeeMember" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EmployeesAndDirectorsMember" xlink:label="sgbx_EmployeesAndDirectorsMember" xlink:title="sgbx_EmployeesAndDirectorsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_EmployeesAndDirectorsMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_EmployeesAndDirectorsMember" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NonEmployeeDirectorMember" xlink:label="sgbx_NonEmployeeDirectorMember" xlink:title="sgbx_NonEmployeeDirectorMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_NonEmployeeDirectorMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_NonEmployeeDirectorMember" xlink:type="arc" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_1" xlink:title="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain_1" xlink:title="Definition : srt_TitleOfIndividualAxis to srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementAxis" xlink:label="sgbx_AgreementAxis" xlink:title="sgbx_AgreementAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:to="sgbx_AgreementAxis" xlink:title="Definition : us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable to sgbx_AgreementAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementDomain" xlink:label="sgbx_AgreementDomain" xlink:title="sgbx_AgreementDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="sgbx_AgreementAxis" xlink:to="sgbx_AgreementDomain" xlink:title="Definition : sgbx_AgreementAxis to sgbx_AgreementDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AdvisoryAgreementMember" xlink:label="sgbx_AdvisoryAgreementMember" xlink:title="sgbx_AdvisoryAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AgreementDomain" xlink:to="sgbx_AdvisoryAgreementMember" xlink:title="Definition : sgbx_AgreementDomain to sgbx_AdvisoryAgreementMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementDomain" xlink:label="sgbx_AgreementDomain_1" xlink:title="sgbx_AgreementDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="sgbx_AgreementAxis" xlink:to="sgbx_AgreementDomain_1" xlink:title="Definition : sgbx_AgreementAxis to sgbx_AgreementDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" xlink:title="us-gaap_AwardTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable" xlink:to="us-gaap_AwardTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTitleOfIndividualAndByTypeOfDeferredCompensationTable to us-gaap_AwardTypeAxis" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:title="Definition : us-gaap_AwardTypeAxis to us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" xlink:title="us-gaap_RestrictedStockMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_RestrictedStockMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="Definition : us-gaap_AwardTypeAxis to us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockOptionsAndGrantsTextualAbstract" xlink:label="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:title="sgbx_StockOptionsAndGrantsTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems" xlink:to="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:title="Definition : us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems to sgbx_StockOptionsAndGrantsTextualAbstract" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation" xlink:title="us-gaap_ShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensation" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensation" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:title="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:title="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" xlink:title="us-gaap_AllocatedShareBasedCompensationExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:title="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedNonVestedStockOptionsWeightedAverageTermOne" xlink:label="sgbx_ShareBasedNonVestedStockOptionsWeightedAverageTermOne" xlink:title="sgbx_ShareBasedNonVestedStockOptionsWeightedAverageTermOne"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="sgbx_ShareBasedNonVestedStockOptionsWeightedAverageTermOne" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to sgbx_ShareBasedNonVestedStockOptionsWeightedAverageTermOne" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharePrice" xlink:label="us-gaap_SharePrice" xlink:title="us-gaap_SharePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_SharePrice" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_SharePrice" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="us-gaap_SharesIssuedPricePerShare" xlink:title="us-gaap_SharesIssuedPricePerShare"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_SharesIssuedPricePerShare" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_SharesIssuedPricePerShare" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NumberOfEmployees" xlink:label="sgbx_NumberOfEmployees" xlink:title="sgbx_NumberOfEmployees"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="sgbx_NumberOfEmployees" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to sgbx_NumberOfEmployees" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:type="arc" use="optional" order="13" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="14" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OptionsVestedDescription" xlink:label="sgbx_OptionsVestedDescription" xlink:title="sgbx_OptionsVestedDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="sgbx_OptionsVestedDescription" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to sgbx_OptionsVestedDescription" xlink:type="arc" order="15" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NumberOfDirectors" xlink:label="sgbx_NumberOfDirectors" xlink:title="sgbx_NumberOfDirectors"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="sgbx_NumberOfDirectors" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to sgbx_NumberOfDirectors" xlink:type="arc" order="16" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AllocatedShareBasedCompensationExpenseAccrued" xlink:label="sgbx_AllocatedShareBasedCompensationExpenseAccrued" xlink:title="sgbx_AllocatedShareBasedCompensationExpenseAccrued"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="sgbx_AllocatedShareBasedCompensationExpenseAccrued" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to sgbx_AllocatedShareBasedCompensationExpenseAccrued" xlink:type="arc" order="17" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockOptionsAndGrantsTextualAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms" xlink:title="Definition : sgbx_StockOptionsAndGrantsTextualAbstract to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationDescriptionAndTerms" xlink:type="arc" use="optional" order="18" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SubsequentEventDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="us-gaap_SubsequentEventLineItems" xlink:title="us-gaap_SubsequentEventLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="us-gaap_SubsequentEventTable" xlink:title="us-gaap_SubsequentEventTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SubsequentEventTable" xlink:title="Definition : us-gaap_SubsequentEventLineItems to us-gaap_SubsequentEventTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:title="us-gaap_SubsequentEventTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_SubsequentEventTable" xlink:to="us-gaap_SubsequentEventTypeAxis" xlink:title="Definition : us-gaap_SubsequentEventTable to us-gaap_SubsequentEventTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:title="us-gaap_SubsequentEventTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain" xlink:title="Definition : us-gaap_SubsequentEventTypeAxis to us-gaap_SubsequentEventTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="us-gaap_SubsequentEventMember" xlink:title="us-gaap_SubsequentEventMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventMember" xlink:title="Definition : us-gaap_SubsequentEventTypeDomain to us-gaap_SubsequentEventMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="us-gaap_SubsequentEventTypeDomain_1" xlink:title="us-gaap_SubsequentEventTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain_1" xlink:title="Definition : us-gaap_SubsequentEventTypeAxis to us-gaap_SubsequentEventTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="us-gaap_FinancialInstrumentAxis" xlink:title="us-gaap_FinancialInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_SubsequentEventTable" xlink:to="us-gaap_FinancialInstrumentAxis" xlink:title="Definition : us-gaap_SubsequentEventTable to us-gaap_FinancialInstrumentAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:title="Definition : us-gaap_FinancialInstrumentAxis to us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtMember" xlink:label="us-gaap_DebtMember" xlink:title="us-gaap_DebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_DebtMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to us-gaap_DebtMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DebtOneMember" xlink:label="sgbx_DebtOneMember" xlink:title="sgbx_DebtOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="sgbx_DebtOneMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to sgbx_DebtOneMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SecuritiesPurchaseAgreementMember" xlink:label="sgbx_SecuritiesPurchaseAgreementMember" xlink:title="sgbx_SecuritiesPurchaseAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="sgbx_SecuritiesPurchaseAgreementMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to sgbx_SecuritiesPurchaseAgreementMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="Definition : us-gaap_FinancialInstrumentAxis to us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_SubsequentEventTable" xlink:to="srt_TitleOfIndividualAxis" xlink:title="Definition : us-gaap_SubsequentEventTable to srt_TitleOfIndividualAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EchosRealEstateHoldingsMember" xlink:label="sgbx_EchosRealEstateHoldingsMember" xlink:title="sgbx_EchosRealEstateHoldingsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_EchosRealEstateHoldingsMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_EchosRealEstateHoldingsMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SGBDevelopmentCorpMember" xlink:label="sgbx_SGBDevelopmentCorpMember" xlink:title="sgbx_SGBDevelopmentCorpMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_SGBDevelopmentCorpMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_SGBDevelopmentCorpMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_1" xlink:title="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventDescription" xlink:label="us-gaap_SubsequentEventDescription" xlink:title="us-gaap_SubsequentEventDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SubsequentEventDescription" xlink:title="Definition : us-gaap_SubsequentEventLineItems to us-gaap_SubsequentEventDescription" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssued" xlink:label="us-gaap_SharesIssued" xlink:title="us-gaap_SharesIssued"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SharesIssued" xlink:title="Definition : us-gaap_SubsequentEventLineItems to us-gaap_SharesIssued" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="us-gaap_ProceedsFromWarrantExercises" xlink:title="us-gaap_ProceedsFromWarrantExercises"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_ProceedsFromWarrantExercises" xlink:title="Definition : us-gaap_SubsequentEventLineItems to us-gaap_ProceedsFromWarrantExercises" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationDetails1">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_AwardTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to us-gaap_AwardTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" xlink:title="us-gaap_EmployeeStockOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_EmployeeStockOptionMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_EmployeeStockOptionMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" xlink:title="srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="srt_RangeAxis" xlink:title="Definition : us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable to srt_RangeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember" xlink:title="srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" xlink:title="Definition : srt_RangeAxis to srt_RangeMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" xlink:title="srt_MinimumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" xlink:title="Definition : srt_RangeMember to srt_MinimumMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" xlink:title="srt_MaximumMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" xlink:title="Definition : srt_RangeMember to srt_MaximumMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember_1" xlink:title="srt_RangeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember_1" xlink:title="Definition : srt_RangeAxis to srt_RangeMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Constructionbacklogdetailstextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="us-gaap_RestructuringCostAndReserveLineItems" xlink:title="us-gaap_RestructuringCostAndReserveLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:title="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RestructuringCostAndReserveLineItems" xlink:to="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:title="Definition : us-gaap_RestructuringCostAndReserveLineItems to us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="us-gaap_RestructuringCostAndReserveAxis" xlink:title="us-gaap_RestructuringCostAndReserveAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:to="us-gaap_RestructuringCostAndReserveAxis" xlink:title="Definition : us-gaap_ScheduleOfRestructuringAndRelatedCostsTable to us-gaap_RestructuringCostAndReserveAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="us-gaap_TypeOfRestructuringDomain" xlink:title="us-gaap_TypeOfRestructuringDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RestructuringCostAndReserveAxis" xlink:to="us-gaap_TypeOfRestructuringDomain" xlink:title="Definition : us-gaap_RestructuringCostAndReserveAxis to us-gaap_TypeOfRestructuringDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ContractOneMember" xlink:label="sgbx_ContractOneMember" xlink:title="sgbx_ContractOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="sgbx_ContractOneMember" xlink:title="Definition : us-gaap_TypeOfRestructuringDomain to sgbx_ContractOneMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ContractTwoMember" xlink:label="sgbx_ContractTwoMember" xlink:title="sgbx_ContractTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="sgbx_ContractTwoMember" xlink:title="Definition : us-gaap_TypeOfRestructuringDomain to sgbx_ContractTwoMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ContractThreeMember" xlink:label="sgbx_ContractThreeMember" xlink:title="sgbx_ContractThreeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="sgbx_ContractThreeMember" xlink:title="Definition : us-gaap_TypeOfRestructuringDomain to sgbx_ContractThreeMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MovedContractMember" xlink:label="sgbx_MovedContractMember" xlink:title="sgbx_MovedContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="sgbx_MovedContractMember" xlink:title="Definition : us-gaap_TypeOfRestructuringDomain to sgbx_MovedContractMember" xlink:type="arc" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="us-gaap_TypeOfRestructuringDomain_1" xlink:title="us-gaap_TypeOfRestructuringDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RestructuringCostAndReserveAxis" xlink:to="us-gaap_TypeOfRestructuringDomain_1" xlink:title="Definition : us-gaap_RestructuringCostAndReserveAxis to us-gaap_TypeOfRestructuringDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LeaseArrangementTypesAxis" xlink:label="sgbx_LeaseArrangementTypesAxis" xlink:title="sgbx_LeaseArrangementTypesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:to="sgbx_LeaseArrangementTypesAxis" xlink:title="Definition : us-gaap_ScheduleOfRestructuringAndRelatedCostsTable to sgbx_LeaseArrangementTypesAxis" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LeaseArrangementTypesDomain" xlink:label="sgbx_LeaseArrangementTypesDomain" xlink:title="sgbx_LeaseArrangementTypesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="sgbx_LeaseArrangementTypesAxis" xlink:to="sgbx_LeaseArrangementTypesDomain" xlink:title="Definition : sgbx_LeaseArrangementTypesAxis to sgbx_LeaseArrangementTypesDomain" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ExclusiveLicenseAgreementMember" xlink:label="sgbx_ExclusiveLicenseAgreementMember" xlink:title="sgbx_ExclusiveLicenseAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_LeaseArrangementTypesDomain" xlink:to="sgbx_ExclusiveLicenseAgreementMember" xlink:title="Definition : sgbx_LeaseArrangementTypesDomain to sgbx_ExclusiveLicenseAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LeaseArrangementTypesDomain" xlink:label="sgbx_LeaseArrangementTypesDomain_1" xlink:title="sgbx_LeaseArrangementTypesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="sgbx_LeaseArrangementTypesAxis" xlink:to="sgbx_LeaseArrangementTypesDomain_1" xlink:title="Definition : sgbx_LeaseArrangementTypesAxis to sgbx_LeaseArrangementTypesDomain" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionBacklogTextualAbstract" xlink:label="sgbx_ConstructionBacklogTextualAbstract" xlink:title="sgbx_ConstructionBacklogTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringCostAndReserveLineItems" xlink:to="sgbx_ConstructionBacklogTextualAbstract" xlink:title="Definition : us-gaap_RestructuringCostAndReserveLineItems to sgbx_ConstructionBacklogTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="us-gaap_RevenueRemainingPerformanceObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConstructionBacklogTextualAbstract" xlink:to="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="Definition : sgbx_ConstructionBacklogTextualAbstract to us-gaap_RevenueRemainingPerformanceObligation" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NumberOfLargeContracts" xlink:label="sgbx_NumberOfLargeContracts" xlink:title="sgbx_NumberOfLargeContracts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConstructionBacklogTextualAbstract" xlink:to="sgbx_NumberOfLargeContracts" xlink:title="Definition : sgbx_ConstructionBacklogTextualAbstract to sgbx_NumberOfLargeContracts" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionBacklogContractRevenue" xlink:label="sgbx_ConstructionBacklogContractRevenue" xlink:title="sgbx_ConstructionBacklogContractRevenue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConstructionBacklogTextualAbstract" xlink:to="sgbx_ConstructionBacklogContractRevenue" xlink:title="Definition : sgbx_ConstructionBacklogTextualAbstract to sgbx_ConstructionBacklogContractRevenue" xlink:type="arc" order="2" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LiquidityTables">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityLineItems" xlink:label="sgbx_LiquidityLineItems" xlink:title="sgbx_LiquidityLineItems"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityTable" xlink:label="sgbx_LiquidityTable" xlink:title="sgbx_LiquidityTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="sgbx_LiquidityLineItems" xlink:to="sgbx_LiquidityTable" xlink:title="Definition : sgbx_LiquidityLineItems to sgbx_LiquidityTable" xlink:type="arc" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityAxis" xlink:label="sgbx_LiquidityAxis" xlink:title="sgbx_LiquidityAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_LiquidityTable" xlink:to="sgbx_LiquidityAxis" xlink:title="Definition : sgbx_LiquidityTable to sgbx_LiquidityAxis" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityDomain" xlink:label="sgbx_LiquidityDomain" xlink:title="sgbx_LiquidityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="sgbx_LiquidityAxis" xlink:to="sgbx_LiquidityDomain" xlink:title="Definition : sgbx_LiquidityAxis to sgbx_LiquidityDomain" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityMember" xlink:label="sgbx_LiquidityMember" xlink:title="sgbx_LiquidityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_LiquidityDomain" xlink:to="sgbx_LiquidityMember" xlink:title="Definition : sgbx_LiquidityDomain to sgbx_LiquidityMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityDomain" xlink:label="sgbx_LiquidityDomain_1" xlink:title="sgbx_LiquidityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="sgbx_LiquidityAxis" xlink:to="sgbx_LiquidityDomain_1" xlink:title="Definition : sgbx_LiquidityAxis to sgbx_LiquidityDomain" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:title="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_LiquidityLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:title="Definition : sgbx_LiquidityLineItems to us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/PropertyPlantandEquipmentDetailsTextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:title="us-gaap_PropertyPlantAndEquipmentLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:title="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentLineItems to us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EquipmentTextualAbstract" xlink:label="sgbx_EquipmentTextualAbstract" xlink:title="sgbx_EquipmentTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="sgbx_EquipmentTextualAbstract" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentLineItems to sgbx_EquipmentTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation" xlink:label="us-gaap_Depreciation" xlink:title="us-gaap_Depreciation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_EquipmentTextualAbstract" xlink:to="us-gaap_Depreciation" xlink:title="Definition : sgbx_EquipmentTextualAbstract to us-gaap_Depreciation" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Disclosure-ConvertibleDebenturesDetails1">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConvertibleDebenturesLineItems" xlink:label="sgbx_ConvertibleDebenturesLineItems" xlink:title="sgbx_ConvertibleDebenturesLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketableSecuritiesTable" xlink:label="us-gaap_MarketableSecuritiesTable" xlink:title="us-gaap_MarketableSecuritiesTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="sgbx_ConvertibleDebenturesLineItems" xlink:to="us-gaap_MarketableSecuritiesTable" xlink:title="Definition : sgbx_ConvertibleDebenturesLineItems to us-gaap_MarketableSecuritiesTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_MarketableSecuritiesTable" xlink:to="us-gaap_FinancialInstrumentAxis" xlink:title="Definition : us-gaap_MarketableSecuritiesTable to us-gaap_FinancialInstrumentAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConvertibleDebtMember" xlink:label="us-gaap_ConvertibleDebtMember" xlink:title="us-gaap_ConvertibleDebtMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_ConvertibleDebtMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to us-gaap_ConvertibleDebtMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" xlink:title="srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_MarketableSecuritiesTable" xlink:to="srt_RangeAxis" xlink:title="Definition : us-gaap_MarketableSecuritiesTable to srt_RangeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" xlink:title="srt_MaximumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" xlink:title="srt_MinimumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember_1" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentMeasurementInput" xlink:label="us-gaap_DebtInstrumentMeasurementInput" xlink:title="us-gaap_DebtInstrumentMeasurementInput"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesLineItems" xlink:to="us-gaap_DebtInstrumentMeasurementInput" xlink:title="Definition : sgbx_ConvertibleDebenturesLineItems to us-gaap_DebtInstrumentMeasurementInput" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxesDetailsTextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="us-gaap_OperatingLossCarryforwardsLineItems" xlink:title="us-gaap_OperatingLossCarryforwardsLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="us-gaap_OperatingLossCarryforwardsTable" xlink:title="us-gaap_OperatingLossCarryforwardsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_OperatingLossCarryforwardsLineItems" xlink:to="us-gaap_OperatingLossCarryforwardsTable" xlink:title="Definition : us-gaap_OperatingLossCarryforwardsLineItems to us-gaap_OperatingLossCarryforwardsTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" xlink:title="srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_OperatingLossCarryforwardsTable" xlink:to="srt_RangeAxis" xlink:title="Definition : us-gaap_OperatingLossCarryforwardsTable to srt_RangeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" xlink:title="srt_MaximumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" xlink:title="srt_MinimumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember_1" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_IncomeTaxTextualAbstract" xlink:label="sgbx_IncomeTaxTextualAbstract" xlink:title="sgbx_IncomeTaxTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingLossCarryforwardsLineItems" xlink:to="sgbx_IncomeTaxTextualAbstract" xlink:title="Definition : us-gaap_OperatingLossCarryforwardsLineItems to sgbx_IncomeTaxTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:title="us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:title="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:title="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="us-gaap_OperatingLossCarryforwards" xlink:title="us-gaap_OperatingLossCarryforwards"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_OperatingLossCarryforwards" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_OperatingLossCarryforwards" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:label="us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:title="us-gaap_OperatingLossCarryforwardsExpirationDate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="us-gaap_UnrecognizedTaxBenefits" xlink:title="us-gaap_UnrecognizedTaxBenefits"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_IncomeTaxTextualAbstract" xlink:to="us-gaap_UnrecognizedTaxBenefits" xlink:title="Definition : sgbx_IncomeTaxTextualAbstract to us-gaap_UnrecognizedTaxBenefits" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DebtorinPossessionFinancingDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:title="us-gaap_AccountsNotesAndLoansReceivableLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:title="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:to="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:title="Definition : us-gaap_AccountsNotesAndLoansReceivableLineItems to us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:title="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:to="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable to us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="us-gaap_ReceivableTypeDomain" xlink:title="us-gaap_ReceivableTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:to="us-gaap_ReceivableTypeDomain" xlink:title="Definition : us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis to us-gaap_ReceivableTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansReceivableMember" xlink:label="us-gaap_LoansReceivableMember" xlink:title="us-gaap_LoansReceivableMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivableTypeDomain" xlink:to="us-gaap_LoansReceivableMember" xlink:title="Definition : us-gaap_ReceivableTypeDomain to us-gaap_LoansReceivableMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:to="us-gaap_ReceivableTypeDomain_1" xlink:title="Definition : us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis to us-gaap_ReceivableTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:label="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:title="sgbx_DebtorInPossessionFinancingTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:to="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:title="Definition : us-gaap_AccountsNotesAndLoansReceivableLineItems to sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtorInPossessionFinancingAmountArranged" xlink:label="us-gaap_DebtorInPossessionFinancingAmountArranged" xlink:title="us-gaap_DebtorInPossessionFinancingAmountArranged"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:to="us-gaap_DebtorInPossessionFinancingAmountArranged" xlink:title="Definition : sgbx_DebtorInPossessionFinancingTextualAbstract to us-gaap_DebtorInPossessionFinancingAmountArranged" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding" xlink:label="us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding" xlink:title="us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:to="us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding" xlink:title="Definition : sgbx_DebtorInPossessionFinancingTextualAbstract to us-gaap_DebtorInPossessionFinancingInterestRateOnBorrowingsOutstanding" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DebtorInPossessionFinancingArrangementsEffectiveDate" xlink:label="sgbx_DebtorInPossessionFinancingArrangementsEffectiveDate" xlink:title="sgbx_DebtorInPossessionFinancingArrangementsEffectiveDate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:to="sgbx_DebtorInPossessionFinancingArrangementsEffectiveDate" xlink:title="Definition : sgbx_DebtorInPossessionFinancingTextualAbstract to sgbx_DebtorInPossessionFinancingArrangementsEffectiveDate" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding" xlink:label="us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding" xlink:title="us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DebtorInPossessionFinancingTextualAbstract" xlink:to="us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding" xlink:title="Definition : sgbx_DebtorInPossessionFinancingTextualAbstract to us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConvertibleDebenturesDetailsTextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" xlink:title="us-gaap_DebtInstrumentLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" xlink:title="us-gaap_DebtInstrumentTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" xlink:title="Definition : us-gaap_DebtInstrumentLineItems to us-gaap_DebtInstrumentTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" xlink:title="us-gaap_DebtInstrumentAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentAxis" xlink:title="Definition : us-gaap_DebtInstrumentTable to us-gaap_DebtInstrumentAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" xlink:title="us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" xlink:title="Definition : us-gaap_DebtInstrumentAxis to us-gaap_DebtInstrumentNameDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember" xlink:label="us-gaap_ConvertibleDebtSecuritiesMember" xlink:title="us-gaap_ConvertibleDebtSecuritiesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="us-gaap_ConvertibleDebtSecuritiesMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to us-gaap_ConvertibleDebtSecuritiesMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_TwoZeroOneSixDebentureMember" xlink:label="sgbx_TwoZeroOneSixDebentureMember" xlink:title="sgbx_TwoZeroOneSixDebentureMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="sgbx_TwoZeroOneSixDebentureMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to sgbx_TwoZeroOneSixDebentureMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ExitFacilityMember" xlink:label="sgbx_ExitFacilityMember" xlink:title="sgbx_ExitFacilityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="sgbx_ExitFacilityMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to sgbx_ExitFacilityMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NovemberTwoZeroOneSixDebentureMember" xlink:label="sgbx_NovemberTwoZeroOneSixDebentureMember" xlink:title="sgbx_NovemberTwoZeroOneSixDebentureMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="sgbx_NovemberTwoZeroOneSixDebentureMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to sgbx_NovemberTwoZeroOneSixDebentureMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_1" xlink:title="us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain_1" xlink:title="Definition : us-gaap_DebtInstrumentAxis to us-gaap_DebtInstrumentNameDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_FinancialInstrumentAxis" xlink:title="Definition : us-gaap_DebtInstrumentTable to us-gaap_FinancialInstrumentAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="sgbx_SecuritiesPurchaseAgreementMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to sgbx_SecuritiesPurchaseAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_PlacementAgencyAgreementMember" xlink:label="sgbx_PlacementAgencyAgreementMember" xlink:title="sgbx_PlacementAgencyAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="sgbx_PlacementAgencyAgreementMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to sgbx_PlacementAgencyAgreementMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConvertibleDebenturesTextualAbstract" xlink:label="sgbx_ConvertibleDebenturesTextualAbstract" xlink:title="sgbx_ConvertibleDebenturesTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="sgbx_ConvertibleDebenturesTextualAbstract" xlink:title="Definition : us-gaap_DebtInstrumentLineItems to sgbx_ConvertibleDebenturesTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromRelatedPartyDebt" xlink:label="us-gaap_ProceedsFromRelatedPartyDebt" xlink:title="us-gaap_ProceedsFromRelatedPartyDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_ProceedsFromRelatedPartyDebt" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_ProceedsFromRelatedPartyDebt" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:title="us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount" xlink:title="us-gaap_DebtInstrumentUnamortizedDiscount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_DebtInstrumentUnamortizedDiscount" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_DebtInstrumentUnamortizedDiscount" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:title="us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:title="us-gaap_DebtConversionConvertedInstrumentAmount1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:label="us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:title="us-gaap_DebtConversionConvertedInstrumentSharesIssued1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrealizedGainLossOnSecurities" xlink:label="us-gaap_UnrealizedGainLossOnSecurities" xlink:title="us-gaap_UnrealizedGainLossOnSecurities"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_UnrealizedGainLossOnSecurities" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_UnrealizedGainLossOnSecurities" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="us-gaap_InterestExpenseDebt" xlink:title="us-gaap_InterestExpenseDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_InterestExpenseDebt" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_InterestExpenseDebt" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_FairValueOfConversionOptionLiabilitiesOne" xlink:label="sgbx_FairValueOfConversionOptionLiabilitiesOne" xlink:title="sgbx_FairValueOfConversionOptionLiabilitiesOne"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_FairValueOfConversionOptionLiabilitiesOne" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_FairValueOfConversionOptionLiabilitiesOne" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromConvertibleDebt" xlink:label="us-gaap_ProceedsFromConvertibleDebt" xlink:title="us-gaap_ProceedsFromConvertibleDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_ProceedsFromConvertibleDebt" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_ProceedsFromConvertibleDebt" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CostOfGoodSoldSubscription" xlink:label="sgbx_CostOfGoodSoldSubscription" xlink:title="sgbx_CostOfGoodSoldSubscription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_CostOfGoodSoldSubscription" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_CostOfGoodSoldSubscription" xlink:type="arc" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentRedemptionDescription" xlink:label="us-gaap_DebtInstrumentRedemptionDescription" xlink:title="us-gaap_DebtInstrumentRedemptionDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_DebtInstrumentRedemptionDescription" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_DebtInstrumentRedemptionDescription" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForFees" xlink:label="us-gaap_PaymentsForFees" xlink:title="us-gaap_PaymentsForFees"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_PaymentsForFees" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_PaymentsForFees" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConversionOfStockDescription" xlink:label="us-gaap_ConversionOfStockDescription" xlink:title="us-gaap_ConversionOfStockDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="us-gaap_ConversionOfStockDescription" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to us-gaap_ConversionOfStockDescription" xlink:type="arc" use="optional" order="13" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_PercentageOfExercisePrice" xlink:label="sgbx_PercentageOfExercisePrice" xlink:title="sgbx_PercentageOfExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_PercentageOfExercisePrice" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_PercentageOfExercisePrice" xlink:type="arc" order="14" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CommonStockUnderlyingDebenture" xlink:label="sgbx_CommonStockUnderlyingDebenture" xlink:title="sgbx_CommonStockUnderlyingDebenture"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_CommonStockUnderlyingDebenture" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_CommonStockUnderlyingDebenture" xlink:type="arc" order="15" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_PercentageOfGrossProceed" xlink:label="sgbx_PercentageOfGrossProceed" xlink:title="sgbx_PercentageOfGrossProceed"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_PercentageOfGrossProceed" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_PercentageOfGrossProceed" xlink:type="arc" order="16" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantsToPurchaseRate" xlink:label="sgbx_WarrantsToPurchaseRate" xlink:title="sgbx_WarrantsToPurchaseRate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_ConvertibleDebenturesTextualAbstract" xlink:to="sgbx_WarrantsToPurchaseRate" xlink:title="Definition : sgbx_ConvertibleDebenturesTextualAbstract to sgbx_WarrantsToPurchaseRate" xlink:type="arc" order="17" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/WarrantsDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsidiarySaleOfStockLineItems" xlink:label="us-gaap_SubsidiarySaleOfStockLineItems" xlink:title="us-gaap_SubsidiarySaleOfStockLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:label="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:title="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SubsidiarySaleOfStockLineItems" xlink:to="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:title="Definition : us-gaap_SubsidiarySaleOfStockLineItems to us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:title="us-gaap_StatementEquityComponentsAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:to="us-gaap_StatementEquityComponentsAxis" xlink:title="Definition : us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable to us-gaap_StatementEquityComponentsAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" xlink:title="us-gaap_EquityComponentDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" xlink:title="Definition : us-gaap_StatementEquityComponentsAxis to us-gaap_EquityComponentDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WarrantMember" xlink:label="us-gaap_WarrantMember" xlink:title="us-gaap_WarrantMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_WarrantMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_WarrantMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_1" xlink:title="Definition : us-gaap_StatementEquityComponentsAxis to us-gaap_EquityComponentDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="us-gaap_ClassOfWarrantOrRightAxis" xlink:title="us-gaap_ClassOfWarrantOrRightAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:to="us-gaap_ClassOfWarrantOrRightAxis" xlink:title="Definition : us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable to us-gaap_ClassOfWarrantOrRightAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="us-gaap_ClassOfWarrantOrRightDomain" xlink:title="us-gaap_ClassOfWarrantOrRightDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ClassOfWarrantOrRightAxis" xlink:to="us-gaap_ClassOfWarrantOrRightDomain" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightAxis to us-gaap_ClassOfWarrantOrRightDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantOneMember" xlink:label="sgbx_WarrantOneMember" xlink:title="sgbx_WarrantOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="sgbx_WarrantOneMember" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightDomain to sgbx_WarrantOneMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantTwoMember" xlink:label="sgbx_WarrantTwoMember" xlink:title="sgbx_WarrantTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="sgbx_WarrantTwoMember" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightDomain to sgbx_WarrantTwoMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantThreeMember" xlink:label="sgbx_WarrantThreeMember" xlink:title="sgbx_WarrantThreeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="sgbx_WarrantThreeMember" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightDomain to sgbx_WarrantThreeMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantFourMember" xlink:label="sgbx_WarrantFourMember" xlink:title="sgbx_WarrantFourMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfWarrantOrRightDomain" xlink:to="sgbx_WarrantFourMember" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightDomain to sgbx_WarrantFourMember" xlink:type="arc" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_1" xlink:title="us-gaap_ClassOfWarrantOrRightDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ClassOfWarrantOrRightAxis" xlink:to="us-gaap_ClassOfWarrantOrRightDomain_1" xlink:title="Definition : us-gaap_ClassOfWarrantOrRightAxis to us-gaap_ClassOfWarrantOrRightDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="us-gaap_SubsidiarySaleOfStockAxis" xlink:title="us-gaap_SubsidiarySaleOfStockAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" xlink:title="Definition : us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable to us-gaap_SubsidiarySaleOfStockAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:title="us-gaap_SaleOfStockNameOfTransactionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:title="Definition : us-gaap_SubsidiarySaleOfStockAxis to us-gaap_SaleOfStockNameOfTransactionDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CommonStockIssuedUnderUnderwritingAgreementMember" xlink:label="sgbx_CommonStockIssuedUnderUnderwritingAgreementMember" xlink:title="sgbx_CommonStockIssuedUnderUnderwritingAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="sgbx_CommonStockIssuedUnderUnderwritingAgreementMember" xlink:title="Definition : us-gaap_SaleOfStockNameOfTransactionDomain to sgbx_CommonStockIssuedUnderUnderwritingAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_1" xlink:title="us-gaap_SaleOfStockNameOfTransactionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain_1" xlink:title="Definition : us-gaap_SubsidiarySaleOfStockAxis to us-gaap_SaleOfStockNameOfTransactionDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantsTextualAbstract" xlink:label="sgbx_WarrantsTextualAbstract" xlink:title="sgbx_WarrantsTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsidiarySaleOfStockLineItems" xlink:to="sgbx_WarrantsTextualAbstract" xlink:title="Definition : us-gaap_SubsidiarySaleOfStockLineItems to sgbx_WarrantsTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantsToPurchase" xlink:label="sgbx_WarrantsToPurchase" xlink:title="sgbx_WarrantsToPurchase"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_WarrantsTextualAbstract" xlink:to="sgbx_WarrantsToPurchase" xlink:title="Definition : sgbx_WarrantsTextualAbstract to sgbx_WarrantsToPurchase" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_WarrantsTextualAbstract" xlink:to="us-gaap_SharePrice" xlink:title="Definition : sgbx_WarrantsTextualAbstract to us-gaap_SharePrice" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="us-gaap_FairValueAdjustmentOfWarrants" xlink:title="us-gaap_FairValueAdjustmentOfWarrants"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_WarrantsTextualAbstract" xlink:to="us-gaap_FairValueAdjustmentOfWarrants" xlink:title="Definition : sgbx_WarrantsTextualAbstract to us-gaap_FairValueAdjustmentOfWarrants" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" xlink:title="us-gaap_DebtInstrumentMaturityDate"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_WarrantsTextualAbstract" xlink:to="us-gaap_DebtInstrumentMaturityDate" xlink:title="Definition : sgbx_WarrantsTextualAbstract to us-gaap_DebtInstrumentMaturityDate" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:title="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_WarrantsTextualAbstract" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:title="Definition : sgbx_WarrantsTextualAbstract to us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConvertibleDebenturesDetails">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConvertibleDebentureMember" xlink:label="sgbx_ConvertibleDebentureMember" xlink:title="sgbx_ConvertibleDebentureMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="sgbx_ConvertibleDebentureMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to sgbx_ConvertibleDebentureMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConvertibleDebentureOneMember" xlink:label="sgbx_ConvertibleDebentureOneMember" xlink:title="sgbx_ConvertibleDebentureOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="sgbx_ConvertibleDebentureOneMember" xlink:title="Definition : us-gaap_DebtInstrumentNameDomain to sgbx_ConvertibleDebentureOneMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_1" xlink:title="us-gaap_DebtInstrumentNameDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt" xlink:title="us-gaap_LongTermDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongTermDebt" xlink:title="Definition : us-gaap_DebtInstrumentLineItems to us-gaap_LongTermDebt" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="us-gaap_LongTermDebtCurrent" xlink:title="us-gaap_LongTermDebtCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongTermDebtCurrent" xlink:title="Definition : us-gaap_DebtInstrumentLineItems to us-gaap_LongTermDebtCurrent" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="us-gaap_LongTermDebtNoncurrent" xlink:title="us-gaap_LongTermDebtNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongTermDebtNoncurrent" xlink:title="Definition : us-gaap_DebtInstrumentLineItems to us-gaap_LongTermDebtNoncurrent" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/PropertyPlantandEquipmentDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:title="us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfPropertyPlantAndEquipmentTable to us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:title="us-gaap_PropertyPlantAndEquipmentTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentByTypeAxis to us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerEquipmentMember" xlink:label="us-gaap_ComputerEquipmentMember" xlink:title="us-gaap_ComputerEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_ComputerEquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_ComputerEquipmentMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_FurnitureAndOtherEquipmentMember" xlink:label="sgbx_FurnitureAndOtherEquipmentMember" xlink:title="sgbx_FurnitureAndOtherEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="sgbx_FurnitureAndOtherEquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to sgbx_FurnitureAndOtherEquipmentMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="us-gaap_LeaseholdImprovementsMember" xlink:title="us-gaap_LeaseholdImprovementsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_LeaseholdImprovementsMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_LeaseholdImprovementsMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="us-gaap_MachineryAndEquipmentMember" xlink:title="us-gaap_MachineryAndEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_MachineryAndEquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_MachineryAndEquipmentMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AutomobilesMember" xlink:label="us-gaap_AutomobilesMember" xlink:title="us-gaap_AutomobilesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_AutomobilesMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_AutomobilesMember" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_BuildingHeldForLeaseMember" xlink:label="sgbx_BuildingHeldForLeaseMember" xlink:title="sgbx_BuildingHeldForLeaseMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="sgbx_BuildingHeldForLeaseMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to sgbx_BuildingHeldForLeaseMember" xlink:type="arc" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LaboratoryAndTemporaryUnitsMember" xlink:label="sgbx_LaboratoryAndTemporaryUnitsMember" xlink:title="sgbx_LaboratoryAndTemporaryUnitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="sgbx_LaboratoryAndTemporaryUnitsMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to sgbx_LaboratoryAndTemporaryUnitsMember" xlink:type="arc" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_1" xlink:title="us-gaap_PropertyPlantAndEquipmentTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain_1" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentByTypeAxis to us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:label="us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:title="us-gaap_PropertyPlantAndEquipmentNetAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentLineItems to us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="us-gaap_PropertyPlantAndEquipmentGross" xlink:title="us-gaap_PropertyPlantAndEquipmentGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentGross" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentNetAbstract to us-gaap_PropertyPlantAndEquipmentGross" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:title="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentNetAbstract to us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" xlink:title="us-gaap_PropertyPlantAndEquipmentNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentNet" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentNetAbstract to us-gaap_PropertyPlantAndEquipmentNet" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/AccountsReceivableDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:label="us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:title="us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:to="us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable to us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesBillingStatusDomain" xlink:label="us-gaap_ReceivablesBillingStatusDomain" xlink:title="us-gaap_ReceivablesBillingStatusDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:to="us-gaap_ReceivablesBillingStatusDomain" xlink:title="Definition : us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis to us-gaap_ReceivablesBillingStatusDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SgBlocksSalesMember" xlink:label="sgbx_SgBlocksSalesMember" xlink:title="sgbx_SgBlocksSalesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_SgBlocksSalesMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_SgBlocksSalesMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionRevenueMember" xlink:label="sgbx_ConstructionRevenueMember" xlink:title="sgbx_ConstructionRevenueMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_ConstructionRevenueMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_ConstructionRevenueMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_BilledEngineeringServicesMember" xlink:label="sgbx_BilledEngineeringServicesMember" xlink:title="sgbx_BilledEngineeringServicesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_BilledEngineeringServicesMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_BilledEngineeringServicesMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RetainageReceivableMember" xlink:label="sgbx_RetainageReceivableMember" xlink:title="sgbx_RetainageReceivableMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_RetainageReceivableMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_RetainageReceivableMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalMember" xlink:label="sgbx_MedicalMember" xlink:title="sgbx_MedicalMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_MedicalMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_MedicalMember" xlink:type="arc" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OtherReceivableMember" xlink:label="sgbx_OtherReceivableMember" xlink:title="sgbx_OtherReceivableMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivablesBillingStatusDomain" xlink:to="sgbx_OtherReceivableMember" xlink:title="Definition : us-gaap_ReceivablesBillingStatusDomain to sgbx_OtherReceivableMember" xlink:type="arc" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesBillingStatusDomain" xlink:label="us-gaap_ReceivablesBillingStatusDomain_1" xlink:title="us-gaap_ReceivablesBillingStatusDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis" xlink:to="us-gaap_ReceivablesBillingStatusDomain_1" xlink:title="Definition : us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis to us-gaap_ReceivablesBillingStatusDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrentAbstract" xlink:label="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:title="us-gaap_AccountsReceivableNetCurrentAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:to="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:title="Definition : us-gaap_AccountsNotesAndLoansReceivableLineItems to us-gaap_AccountsReceivableNetCurrentAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="us-gaap_AccountsReceivableGrossCurrent" xlink:title="us-gaap_AccountsReceivableGrossCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:to="us-gaap_AccountsReceivableGrossCurrent" xlink:title="Definition : us-gaap_AccountsReceivableNetCurrentAbstract to us-gaap_AccountsReceivableGrossCurrent" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:title="Definition : us-gaap_AccountsReceivableNetCurrentAbstract to us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DueFromRelatedPartiesCurrent" xlink:label="us-gaap_DueFromRelatedPartiesCurrent" xlink:title="us-gaap_DueFromRelatedPartiesCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:to="us-gaap_DueFromRelatedPartiesCurrent" xlink:title="Definition : us-gaap_AccountsReceivableNetCurrentAbstract to us-gaap_DueFromRelatedPartiesCurrent" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="us-gaap_AccountsReceivableNetCurrent" xlink:title="us-gaap_AccountsReceivableNetCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountsReceivableNetCurrentAbstract" xlink:to="us-gaap_AccountsReceivableNetCurrent" xlink:title="Definition : us-gaap_AccountsReceivableNetCurrentAbstract to us-gaap_AccountsReceivableNetCurrent" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationDetails2">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_EmployeeStockOptionMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_EmployeeStockOptionMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:title="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedWeightedAverageGrantDateFairValue" xlink:label="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedWeightedAverageGrantDateFairValue" xlink:title="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedWeightedAverageGrantDateFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodWeightedAverageGrantDateFairValue" xlink:label="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodWeightedAverageGrantDateFairValue" xlink:title="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodWeightedAverageGrantDateFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodWeightedAverageGrantDateFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodWeightedAverageGrantDateFairValue" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:label="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:title="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue" xlink:label="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue" xlink:title="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue" xlink:type="arc" use="optional" order="13" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:type="arc" use="optional" order="14" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:type="arc" use="optional" order="15" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:type="arc" use="optional" order="16" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:label="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:title="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" xlink:type="arc" use="optional" order="17" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:type="arc" use="optional" order="18" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:type="arc" use="optional" order="19" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueOne" xlink:label="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueOne" xlink:title="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueOne"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueOne" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueOne" xlink:type="arc" use="optional" order="20" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:title="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems to us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:type="arc" use="optional" order="21" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails2">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:title="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:title="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:title="Definition : us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:title="us-gaap_FairValueByMeasurementFrequencyAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:title="Definition : us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable to us-gaap_FairValueByMeasurementFrequencyAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain" xlink:title="us-gaap_FairValueMeasurementFrequencyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueMeasurementFrequencyDomain" xlink:title="Definition : us-gaap_FairValueByMeasurementFrequencyAxis to us-gaap_FairValueMeasurementFrequencyDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="us-gaap_FairValueMeasurementsRecurringMember" xlink:title="us-gaap_FairValueMeasurementsRecurringMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementFrequencyDomain" xlink:to="us-gaap_FairValueMeasurementsRecurringMember" xlink:title="Definition : us-gaap_FairValueMeasurementFrequencyDomain to us-gaap_FairValueMeasurementsRecurringMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_1" xlink:title="us-gaap_FairValueMeasurementFrequencyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueMeasurementFrequencyDomain_1" xlink:title="Definition : us-gaap_FairValueByMeasurementFrequencyAxis to us-gaap_FairValueMeasurementFrequencyDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:title="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:title="Definition : us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable to us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:title="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:title="Definition : us-gaap_FairValueByFairValueHierarchyLevelAxis to us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" xlink:title="us-gaap_FairValueInputsLevel1Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" xlink:title="Definition : us-gaap_FairValueMeasurementsFairValueHierarchyDomain to us-gaap_FairValueInputsLevel1Member" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" xlink:title="us-gaap_FairValueInputsLevel2Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" xlink:title="Definition : us-gaap_FairValueMeasurementsFairValueHierarchyDomain to us-gaap_FairValueInputsLevel2Member" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" xlink:title="us-gaap_FairValueInputsLevel3Member"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" xlink:title="Definition : us-gaap_FairValueMeasurementsFairValueHierarchyDomain to us-gaap_FairValueInputsLevel3Member" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1" xlink:title="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1" xlink:title="Definition : us-gaap_FairValueByFairValueHierarchyLevelAxis to us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:title="us-gaap_LiabilitiesFairValueDisclosureAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:title="Definition : us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems to us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="us-gaap_ShortTermInvestments" xlink:title="us-gaap_ShortTermInvestments"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:to="us-gaap_ShortTermInvestments" xlink:title="Definition : us-gaap_LiabilitiesFairValueDisclosureAbstract to us-gaap_ShortTermInvestments" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConversionOptionLiabilities" xlink:label="sgbx_ConversionOptionLiabilities" xlink:title="sgbx_ConversionOptionLiabilities"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:to="sgbx_ConversionOptionLiabilities" xlink:title="Definition : us-gaap_LiabilitiesFairValueDisclosureAbstract to sgbx_ConversionOptionLiabilities" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EarnoutLiabilities" xlink:label="sgbx_EarnoutLiabilities" xlink:title="sgbx_EarnoutLiabilities"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:to="sgbx_EarnoutLiabilities" xlink:title="Definition : us-gaap_LiabilitiesFairValueDisclosureAbstract to sgbx_EarnoutLiabilities" xlink:type="arc" order="2" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/StockholdersEquityDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="us-gaap_ClassOfStockLineItems" xlink:title="us-gaap_ClassOfStockLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="us-gaap_ScheduleOfStockByClassTable" xlink:title="us-gaap_ScheduleOfStockByClassTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ClassOfStockLineItems" xlink:to="us-gaap_ScheduleOfStockByClassTable" xlink:title="Definition : us-gaap_ClassOfStockLineItems to us-gaap_ScheduleOfStockByClassTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:title="us-gaap_StatementClassOfStockAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_StatementClassOfStockAxis" xlink:title="Definition : us-gaap_ScheduleOfStockByClassTable to us-gaap_StatementClassOfStockAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="us-gaap_ClassOfStockDomain" xlink:title="us-gaap_ClassOfStockDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" xlink:title="Definition : us-gaap_StatementClassOfStockAxis to us-gaap_ClassOfStockDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" xlink:title="us-gaap_CommonStockMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonStockMember" xlink:title="Definition : us-gaap_ClassOfStockDomain to us-gaap_CommonStockMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="us-gaap_SeriesAPreferredStockMember" xlink:title="us-gaap_SeriesAPreferredStockMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_SeriesAPreferredStockMember" xlink:title="Definition : us-gaap_ClassOfStockDomain to us-gaap_SeriesAPreferredStockMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_IssuanceOfCommonStockAndOptionsForServicesMember" xlink:label="sgbx_IssuanceOfCommonStockAndOptionsForServicesMember" xlink:title="sgbx_IssuanceOfCommonStockAndOptionsForServicesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="sgbx_IssuanceOfCommonStockAndOptionsForServicesMember" xlink:title="Definition : us-gaap_ClassOfStockDomain to sgbx_IssuanceOfCommonStockAndOptionsForServicesMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_1" xlink:title="Definition : us-gaap_StatementClassOfStockAxis to us-gaap_ClassOfStockDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" xlink:title="Definition : us-gaap_ScheduleOfStockByClassTable to us-gaap_SubsidiarySaleOfStockAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IPOMember" xlink:label="us-gaap_IPOMember" xlink:title="us-gaap_IPOMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="us-gaap_IPOMember" xlink:title="Definition : us-gaap_SaleOfStockNameOfTransactionDomain to us-gaap_IPOMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_1" xlink:title="us-gaap_SaleOfStockNameOfTransactionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_DebtInstrumentAxis" xlink:title="Definition : us-gaap_ScheduleOfStockByClassTable to us-gaap_DebtInstrumentAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_1" xlink:title="us-gaap_DebtInstrumentNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_FinancialInstrumentAxis" xlink:title="Definition : us-gaap_ScheduleOfStockByClassTable to us-gaap_FinancialInstrumentAxis" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OptionMember" xlink:label="us-gaap_OptionMember" xlink:title="us-gaap_OptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_OptionMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to us-gaap_OptionMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:title="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfStockByClassTable" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:title="Definition : us-gaap_ScheduleOfStockByClassTable to us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:title="us-gaap_AntidilutiveSecuritiesNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis to us-gaap_AntidilutiveSecuritiesNameDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_PurchaseAgreementMember" xlink:label="sgbx_PurchaseAgreementMember" xlink:title="sgbx_PurchaseAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="sgbx_PurchaseAgreementMember" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesNameDomain to sgbx_PurchaseAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_1" xlink:title="us-gaap_AntidilutiveSecuritiesNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="us-gaap_AntidilutiveSecuritiesNameDomain_1" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis to us-gaap_AntidilutiveSecuritiesNameDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockholdersEquityTextualAbstract" xlink:label="sgbx_StockholdersEquityTextualAbstract" xlink:title="sgbx_StockholdersEquityTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockLineItems" xlink:to="sgbx_StockholdersEquityTextualAbstract" xlink:title="Definition : us-gaap_ClassOfStockLineItems to sgbx_StockholdersEquityTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:title="us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="us-gaap_SaleOfStockPricePerShare" xlink:title="us-gaap_SaleOfStockPricePerShare"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_SaleOfStockPricePerShare" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_SaleOfStockPricePerShare" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts" xlink:title="us-gaap_PaymentsOfStockIssuanceCosts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_PaymentsOfStockIssuanceCosts" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_PaymentsOfStockIssuanceCosts" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfWarrants" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants" xlink:title="us-gaap_ProceedsFromIssuanceOfWarrants"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_ProceedsFromIssuanceOfWarrants" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_ProceedsFromIssuanceOfWarrants" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_IssuanceOfWarrants" xlink:label="sgbx_IssuanceOfWarrants" xlink:title="sgbx_IssuanceOfWarrants"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="sgbx_IssuanceOfWarrants" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to sgbx_IssuanceOfWarrants" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_FairValueAdjustmentOfWarrants" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_FairValueAdjustmentOfWarrants" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantsToPurchaseOfCommonStock" xlink:label="sgbx_WarrantsToPurchaseOfCommonStock" xlink:title="sgbx_WarrantsToPurchaseOfCommonStock"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="sgbx_WarrantsToPurchaseOfCommonStock" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to sgbx_WarrantsToPurchaseOfCommonStock" xlink:type="arc" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:label="us-gaap_ConversionOfStockSharesIssued1" xlink:title="us-gaap_ConversionOfStockSharesIssued1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_ConversionOfStockSharesIssued1" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_ConversionOfStockSharesIssued1" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConversionOfStockAmountIssued1" xlink:label="us-gaap_ConversionOfStockAmountIssued1" xlink:title="us-gaap_ConversionOfStockAmountIssued1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_ConversionOfStockAmountIssued1" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_ConversionOfStockAmountIssued1" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConsultantReceivedOptionToPurchase" xlink:label="sgbx_ConsultantReceivedOptionToPurchase" xlink:title="sgbx_ConsultantReceivedOptionToPurchase"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="sgbx_ConsultantReceivedOptionToPurchase" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to sgbx_ConsultantReceivedOptionToPurchase" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:title="us-gaap_StockIssuedDuringPeriodValueIssuedForServices"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:title="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CommonStockExercisePricePerShare" xlink:label="sgbx_CommonStockExercisePricePerShare" xlink:title="sgbx_CommonStockExercisePricePerShare"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="sgbx_CommonStockExercisePricePerShare" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to sgbx_CommonStockExercisePricePerShare" xlink:type="arc" use="optional" order="13" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LossOnConversionOfConvertibleDebentures" xlink:label="sgbx_LossOnConversionOfConvertibleDebentures" xlink:title="sgbx_LossOnConversionOfConvertibleDebentures"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="sgbx_LossOnConversionOfConvertibleDebentures" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to sgbx_LossOnConversionOfConvertibleDebentures" xlink:type="arc" use="optional" order="14" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss" xlink:label="us-gaap_DebtAndEquitySecuritiesGainLoss" xlink:title="us-gaap_DebtAndEquitySecuritiesGainLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_DebtAndEquitySecuritiesGainLoss" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_DebtAndEquitySecuritiesGainLoss" xlink:type="arc" use="optional" order="15" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:type="arc" use="optional" order="16" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:title="us-gaap_CommonStockSharesAuthorized"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_StockholdersEquityTextualAbstract" xlink:to="us-gaap_CommonStockSharesAuthorized" xlink:title="Definition : sgbx_StockholdersEquityTextualAbstract to us-gaap_CommonStockSharesAuthorized" xlink:type="arc" use="optional" order="17" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConstructionBacklogDetails1">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:title="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="us-gaap_RevenueRemainingPerformanceObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems to us-gaap_RevenueRemainingPerformanceObligation" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:title="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems to us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:type="arc" use="optional" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:label="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:title="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:to="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable to sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:label="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:title="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:to="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis to sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WithinOneYearMember" xlink:label="sgbx_WithinOneYearMember" xlink:title="sgbx_WithinOneYearMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:to="sgbx_WithinOneYearMember" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain to sgbx_WithinOneYearMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OneToTwoYearMember" xlink:label="sgbx_OneToTwoYearMember" xlink:title="sgbx_OneToTwoYearMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:to="sgbx_OneToTwoYearMember" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain to sgbx_OneToTwoYearMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ThereAfterMember" xlink:label="sgbx_ThereAfterMember" xlink:title="sgbx_ThereAfterMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:to="sgbx_ThereAfterMember" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain to sgbx_ThereAfterMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:label="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain_1" xlink:title="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:to="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain_1" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis to sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:type="arc" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConsolidatedStatementsOfOperations">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" xlink:title="us-gaap_StatementLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" xlink:title="us-gaap_StatementTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StatementTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="srt_ProductOrServiceAxis" xlink:title="srt_ProductOrServiceAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="srt_ProductOrServiceAxis" xlink:title="Definition : us-gaap_StatementTable to srt_ProductOrServiceAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain" xlink:title="srt_ProductsAndServicesDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" xlink:title="Definition : srt_ProductOrServiceAxis to srt_ProductsAndServicesDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionMember" xlink:label="us-gaap_ConstructionMember" xlink:title="us-gaap_ConstructionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="us-gaap_ConstructionMember" xlink:title="Definition : srt_ProductsAndServicesDomain to us-gaap_ConstructionMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_EngineeringServicesMember" xlink:label="sgbx_EngineeringServicesMember" xlink:title="sgbx_EngineeringServicesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_EngineeringServicesMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_EngineeringServicesMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalRevenueMember" xlink:label="sgbx_MedicalRevenueMember" xlink:title="sgbx_MedicalRevenueMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_MedicalRevenueMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_MedicalRevenueMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain_1" xlink:title="Definition : srt_ProductOrServiceAxis to srt_ProductsAndServicesDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="us-gaap_RevenuesAbstract" xlink:title="us-gaap_RevenuesAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_RevenuesAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_RevenuesAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues" xlink:title="us-gaap_Revenues"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_Revenues" xlink:title="Definition : us-gaap_RevenuesAbstract to us-gaap_Revenues" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSoldAbstract" xlink:label="us-gaap_CostOfGoodsAndServicesSoldAbstract" xlink:title="us-gaap_CostOfGoodsAndServicesSoldAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CostOfGoodsAndServicesSoldAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_CostOfGoodsAndServicesSoldAbstract" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="us-gaap_CostOfRevenue" xlink:title="us-gaap_CostOfRevenue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CostOfGoodsAndServicesSoldAbstract" xlink:to="us-gaap_CostOfRevenue" xlink:title="Definition : us-gaap_CostOfGoodsAndServicesSoldAbstract to us-gaap_CostOfRevenue" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit" xlink:label="us-gaap_GrossProfit" xlink:title="us-gaap_GrossProfit"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_GrossProfit" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_GrossProfit" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" xlink:title="us-gaap_OperatingExpensesAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OperatingExpensesAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_OperatingExpensesAbstract" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="us-gaap_LaborAndRelatedExpense" xlink:title="us-gaap_LaborAndRelatedExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_LaborAndRelatedExpense" xlink:title="Definition : us-gaap_OperatingExpensesAbstract to us-gaap_LaborAndRelatedExpense" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherGeneralAndAdministrativeExpense" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:title="us-gaap_OtherGeneralAndAdministrativeExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:title="Definition : us-gaap_OperatingExpensesAbstract to us-gaap_OtherGeneralAndAdministrativeExpense" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="us-gaap_SellingAndMarketingExpense" xlink:title="us-gaap_SellingAndMarketingExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_SellingAndMarketingExpense" xlink:title="Definition : us-gaap_OperatingExpensesAbstract to us-gaap_SellingAndMarketingExpense" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherGeneralExpense" xlink:label="us-gaap_OtherGeneralExpense" xlink:title="us-gaap_OtherGeneralExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OtherGeneralExpense" xlink:title="Definition : us-gaap_OperatingExpensesAbstract to us-gaap_OtherGeneralExpense" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" xlink:title="us-gaap_OperatingExpenses"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpenses" xlink:title="Definition : us-gaap_OperatingExpensesAbstract to us-gaap_OperatingExpenses" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss" xlink:title="us-gaap_OperatingIncomeLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OperatingIncomeLoss" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_OperatingIncomeLoss" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:title="us-gaap_NonoperatingIncomeExpenseAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_NonoperatingIncomeExpenseAbstract" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInvestmentExpense" xlink:label="us-gaap_InvestmentIncomeInvestmentExpense" xlink:title="us-gaap_InvestmentIncomeInvestmentExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_InvestmentIncomeInvestmentExpense" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to us-gaap_InvestmentIncomeInvestmentExpense" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest" xlink:title="us-gaap_InvestmentIncomeInterest"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_InvestmentIncomeInterest" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to us-gaap_InvestmentIncomeInterest" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncome" xlink:label="us-gaap_OtherNonoperatingIncome" xlink:title="us-gaap_OtherNonoperatingIncome"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_OtherNonoperatingIncome" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to us-gaap_OtherNonoperatingIncome" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="us-gaap_GainLossOnDispositionOfAssets" xlink:title="us-gaap_GainLossOnDispositionOfAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_GainLossOnDispositionOfAssets" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to us-gaap_GainLossOnDispositionOfAssets" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_GainLossFromEquityAffiliaties" xlink:label="sgbx_GainLossFromEquityAffiliaties" xlink:title="sgbx_GainLossFromEquityAffiliaties"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="sgbx_GainLossFromEquityAffiliaties" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to sgbx_GainLossFromEquityAffiliaties" xlink:type="arc" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="us-gaap_NonoperatingIncomeExpense" xlink:title="us-gaap_NonoperatingIncomeExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_NonoperatingIncomeExpense" xlink:title="Definition : us-gaap_NonoperatingIncomeExpenseAbstract to us-gaap_NonoperatingIncomeExpense" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:title="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" xlink:title="us-gaap_NetIncomeLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetIncomeLoss" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_NetIncomeLoss" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:title="us-gaap_EarningsPerShareBasicAndDilutedAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="us-gaap_EarningsPerShareBasicAndDiluted" xlink:title="us-gaap_EarningsPerShareBasicAndDiluted"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:to="us-gaap_EarningsPerShareBasicAndDiluted" xlink:title="Definition : us-gaap_EarningsPerShareBasicAndDilutedAbstract to us-gaap_EarningsPerShareBasicAndDiluted" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:label="us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:title="us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:to="us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:title="Definition : us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract to us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LiquidityDetails">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityLineItems" xlink:label="sgbx_LiquidityLineItems" xlink:title="sgbx_LiquidityLineItems"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityTable" xlink:label="sgbx_LiquidityTable" xlink:title="sgbx_LiquidityTable"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityAxis" xlink:label="sgbx_LiquidityAxis" xlink:title="sgbx_LiquidityAxis"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityDomain" xlink:label="sgbx_LiquidityDomain" xlink:title="sgbx_LiquidityDomain"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityMember" xlink:label="sgbx_LiquidityMember" xlink:title="sgbx_LiquidityMember"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LiquidityDomain" xlink:label="sgbx_LiquidityDomain_1" xlink:title="sgbx_LiquidityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_LiquidityTable" xlink:to="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:title="Definition : sgbx_LiquidityTable to sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDatesAxis" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WithinOneYearMember" xlink:label="sgbx_WithinOneYearMember" xlink:title="sgbx_WithinOneYearMember"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OneToTwoYearMember" xlink:label="sgbx_OneToTwoYearMember" xlink:title="sgbx_OneToTwoYearMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:to="sgbx_OneToTwoYearMember" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain to sgbx_OneToTwoYearMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ThereAfterMember" xlink:label="sgbx_ThereAfterMember" xlink:title="sgbx_ThereAfterMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain" xlink:to="sgbx_ThereAfterMember" xlink:title="Definition : sgbx_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateDomain to sgbx_ThereAfterMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="us-gaap_RevenueRemainingPerformanceObligation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_LiquidityLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligation" xlink:title="Definition : sgbx_LiquidityLineItems to us-gaap_RevenueRemainingPerformanceObligation" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:title="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:title="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativeInstrumentRiskAxis" xlink:title="us-gaap_DerivativeInstrumentRiskAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:to="us-gaap_DerivativeInstrumentRiskAxis" xlink:title="Definition : us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable to us-gaap_DerivativeInstrumentRiskAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain" xlink:title="us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain" xlink:title="Definition : us-gaap_DerivativeInstrumentRiskAxis to us-gaap_DerivativeContractTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockBasedCompensationPlanMember" xlink:label="sgbx_StockBasedCompensationPlanMember" xlink:title="sgbx_StockBasedCompensationPlanMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="sgbx_StockBasedCompensationPlanMember" xlink:title="Definition : us-gaap_DerivativeContractTypeDomain to sgbx_StockBasedCompensationPlanMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain_1" xlink:title="us-gaap_DerivativeContractTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain_1" xlink:title="Definition : us-gaap_DerivativeInstrumentRiskAxis to us-gaap_DerivativeContractTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:to="us-gaap_AwardTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable to us-gaap_AwardTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockOptionMember" xlink:label="us-gaap_StockOptionMember" xlink:title="us-gaap_StockOptionMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_StockOptionMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_StockOptionMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="us-gaap_RestrictedStockUnitsRSUMember" xlink:title="us-gaap_RestrictedStockUnitsRSUMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_PayrollMember" xlink:label="sgbx_PayrollMember" xlink:title="sgbx_PayrollMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="sgbx_PayrollMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to sgbx_PayrollMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MarketingandBusinessDevelopmentExpensesMember" xlink:label="sgbx_MarketingandBusinessDevelopmentExpensesMember" xlink:title="sgbx_MarketingandBusinessDevelopmentExpensesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="sgbx_MarketingandBusinessDevelopmentExpensesMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to sgbx_MarketingandBusinessDevelopmentExpensesMember" xlink:type="arc" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ShareBasedCompensation" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ShareBasedCompensation" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationDetails3">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:title="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:title="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:title="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:title="Definition : us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems to us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:type="arc" use="optional" order="5" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:to="us-gaap_AwardTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable to us-gaap_AwardTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DescriptionofBusinessDetails">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DescriptionOfBusinessLineItems" xlink:label="sgbx_DescriptionOfBusinessLineItems" xlink:title="sgbx_DescriptionOfBusinessLineItems"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DescriptionOfBusinessTable" xlink:label="sgbx_DescriptionOfBusinessTable" xlink:title="sgbx_DescriptionOfBusinessTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="sgbx_DescriptionOfBusinessLineItems" xlink:to="sgbx_DescriptionOfBusinessTable" xlink:title="Definition : sgbx_DescriptionOfBusinessLineItems to sgbx_DescriptionOfBusinessTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_DescriptionOfBusinessTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" xlink:title="Definition : sgbx_DescriptionOfBusinessTable to us-gaap_SubsidiarySaleOfStockAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IPOMember" xlink:label="us-gaap_IPOMember" xlink:title="us-gaap_IPOMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="us-gaap_IPOMember" xlink:title="Definition : us-gaap_SaleOfStockNameOfTransactionDomain to us-gaap_IPOMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_1" xlink:title="us-gaap_SaleOfStockNameOfTransactionDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_DescriptionOfBusinessTable" xlink:to="us-gaap_SubsequentEventTypeAxis" xlink:title="Definition : sgbx_DescriptionOfBusinessTable to us-gaap_SubsequentEventTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_DescriptionOfBusinessTextualAbstract" xlink:label="sgbx_DescriptionOfBusinessTextualAbstract" xlink:title="sgbx_DescriptionOfBusinessTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DescriptionOfBusinessLineItems" xlink:to="sgbx_DescriptionOfBusinessTextualAbstract" xlink:title="Definition : sgbx_DescriptionOfBusinessLineItems to sgbx_DescriptionOfBusinessTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" xlink:title="us-gaap_CommonStockSharesIssued"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DescriptionOfBusinessTextualAbstract" xlink:to="us-gaap_CommonStockSharesIssued" xlink:title="Definition : sgbx_DescriptionOfBusinessTextualAbstract to us-gaap_CommonStockSharesIssued" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" xlink:title="us-gaap_CommonStockSharesOutstanding"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_DescriptionOfBusinessTextualAbstract" xlink:to="us-gaap_CommonStockSharesOutstanding" xlink:title="Definition : sgbx_DescriptionOfBusinessTextualAbstract to us-gaap_CommonStockSharesOutstanding" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryOfSignificantAccountingPoliciesDetailsTextual">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskLineItems" xlink:label="us-gaap_ConcentrationRiskLineItems" xlink:title="us-gaap_ConcentrationRiskLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskTable" xlink:label="us-gaap_ConcentrationRiskTable" xlink:title="us-gaap_ConcentrationRiskTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ConcentrationRiskLineItems" xlink:to="us-gaap_ConcentrationRiskTable" xlink:title="Definition : us-gaap_ConcentrationRiskLineItems to us-gaap_ConcentrationRiskTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:title="us-gaap_ConcentrationRiskByBenchmarkAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:title="us-gaap_ConcentrationRiskBenchmarkDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:title="Definition : us-gaap_ConcentrationRiskByBenchmarkAxis to us-gaap_ConcentrationRiskBenchmarkDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="us-gaap_AccountsReceivableMember" xlink:title="us-gaap_AccountsReceivableMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="us-gaap_AccountsReceivableMember" xlink:title="Definition : us-gaap_ConcentrationRiskBenchmarkDomain to us-gaap_AccountsReceivableMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SalesRevenueGoodNetMember" xlink:label="sgbx_SalesRevenueGoodNetMember" xlink:title="sgbx_SalesRevenueGoodNetMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="sgbx_SalesRevenueGoodNetMember" xlink:title="Definition : us-gaap_ConcentrationRiskBenchmarkDomain to sgbx_SalesRevenueGoodNetMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsTotalMember" xlink:label="us-gaap_CostOfGoodsTotalMember" xlink:title="us-gaap_CostOfGoodsTotalMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="us-gaap_CostOfGoodsTotalMember" xlink:title="Definition : us-gaap_ConcentrationRiskBenchmarkDomain to us-gaap_CostOfGoodsTotalMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_1" xlink:title="us-gaap_ConcentrationRiskBenchmarkDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskBenchmarkDomain_1" xlink:title="Definition : us-gaap_ConcentrationRiskByBenchmarkAxis to us-gaap_ConcentrationRiskBenchmarkDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="us-gaap_ConcentrationRiskByTypeAxis" xlink:title="us-gaap_ConcentrationRiskByTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="us-gaap_ConcentrationRiskByTypeAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to us-gaap_ConcentrationRiskByTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="us-gaap_ConcentrationRiskTypeDomain" xlink:title="us-gaap_ConcentrationRiskTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ConcentrationRiskByTypeAxis" xlink:to="us-gaap_ConcentrationRiskTypeDomain" xlink:title="Definition : us-gaap_ConcentrationRiskByTypeAxis to us-gaap_ConcentrationRiskTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CustomerOneMember" xlink:label="sgbx_CustomerOneMember" xlink:title="sgbx_CustomerOneMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskTypeDomain" xlink:to="sgbx_CustomerOneMember" xlink:title="Definition : us-gaap_ConcentrationRiskTypeDomain to sgbx_CustomerOneMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CustomerTwoMember" xlink:label="sgbx_CustomerTwoMember" xlink:title="sgbx_CustomerTwoMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskTypeDomain" xlink:to="sgbx_CustomerTwoMember" xlink:title="Definition : us-gaap_ConcentrationRiskTypeDomain to sgbx_CustomerTwoMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CustomerThreeMember" xlink:label="sgbx_CustomerThreeMember" xlink:title="sgbx_CustomerThreeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskTypeDomain" xlink:to="sgbx_CustomerThreeMember" xlink:title="Definition : us-gaap_ConcentrationRiskTypeDomain to sgbx_CustomerThreeMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SupplierConcentrationRiskMember" xlink:label="us-gaap_SupplierConcentrationRiskMember" xlink:title="us-gaap_SupplierConcentrationRiskMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskTypeDomain" xlink:to="us-gaap_SupplierConcentrationRiskMember" xlink:title="Definition : us-gaap_ConcentrationRiskTypeDomain to us-gaap_SupplierConcentrationRiskMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="us-gaap_ConcentrationRiskTypeDomain_1" xlink:title="us-gaap_ConcentrationRiskTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ConcentrationRiskByTypeAxis" xlink:to="us-gaap_ConcentrationRiskTypeDomain_1" xlink:title="Definition : us-gaap_ConcentrationRiskByTypeAxis to us-gaap_ConcentrationRiskTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquipmentMember" xlink:label="us-gaap_EquipmentMember" xlink:title="us-gaap_EquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_EquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_EquipmentMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherMachineryAndEquipmentMember" xlink:label="us-gaap_OtherMachineryAndEquipmentMember" xlink:title="us-gaap_OtherMachineryAndEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_OtherMachineryAndEquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_OtherMachineryAndEquipmentMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_AutomobilesMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_AutomobilesMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalEquipmentMember" xlink:label="sgbx_MedicalEquipmentMember" xlink:title="sgbx_MedicalEquipmentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="sgbx_MedicalEquipmentMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to sgbx_MedicalEquipmentMember" xlink:type="arc" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionMaterialsMember" xlink:label="sgbx_ConstructionMaterialsMember" xlink:title="sgbx_ConstructionMaterialsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="sgbx_ConstructionMaterialsMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to sgbx_ConstructionMaterialsMember" xlink:type="arc" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingMember" xlink:label="us-gaap_BuildingMember" xlink:title="us-gaap_BuildingMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_BuildingMember" xlink:title="Definition : us-gaap_PropertyPlantAndEquipmentTypeDomain to us-gaap_BuildingMember" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_1" xlink:title="us-gaap_PropertyPlantAndEquipmentTypeDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" xlink:title="srt_RangeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="srt_RangeAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to srt_RangeAxis" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" xlink:title="srt_MaximumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" xlink:title="srt_MinimumMember"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember" xlink:label="srt_RangeMember_1" xlink:title="srt_RangeMember"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementAxis" xlink:label="sgbx_AgreementAxis" xlink:title="sgbx_AgreementAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="sgbx_AgreementAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to sgbx_AgreementAxis" xlink:type="arc" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementDomain" xlink:label="sgbx_AgreementDomain" xlink:title="sgbx_AgreementDomain"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OriginalAgreementMember" xlink:label="sgbx_OriginalAgreementMember" xlink:title="sgbx_OriginalAgreementMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AgreementDomain" xlink:to="sgbx_OriginalAgreementMember" xlink:title="Definition : sgbx_AgreementDomain to sgbx_OriginalAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AgreementDomain" xlink:label="sgbx_AgreementDomain_1" xlink:title="sgbx_AgreementDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis" xlink:title="srt_StatementScenarioAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ConcentrationRiskTable" xlink:to="srt_StatementScenarioAxis" xlink:title="Definition : us-gaap_ConcentrationRiskTable to srt_StatementScenarioAxis" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain" xlink:title="srt_ScenarioUnspecifiedDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain" xlink:title="Definition : srt_StatementScenarioAxis to srt_ScenarioUnspecifiedDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioForecastMember" xlink:label="srt_ScenarioForecastMember" xlink:title="srt_ScenarioForecastMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ScenarioUnspecifiedDomain" xlink:to="srt_ScenarioForecastMember" xlink:title="Definition : srt_ScenarioUnspecifiedDomain to srt_ScenarioForecastMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain_1" xlink:title="Definition : srt_StatementScenarioAxis to srt_ScenarioUnspecifiedDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_AccountingPoliciesTextualAbstract" xlink:label="sgbx_AccountingPoliciesTextualAbstract" xlink:title="sgbx_AccountingPoliciesTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskLineItems" xlink:to="sgbx_AccountingPoliciesTextualAbstract" xlink:title="Definition : us-gaap_ConcentrationRiskLineItems to sgbx_AccountingPoliciesTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="us-gaap_InventoryWorkInProcess" xlink:title="us-gaap_InventoryWorkInProcess"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_InventoryWorkInProcess" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_InventoryWorkInProcess" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankruptcyProceedingsDescriptionOfProceedings" xlink:label="us-gaap_BankruptcyProceedingsDescriptionOfProceedings" xlink:title="us-gaap_BankruptcyProceedingsDescriptionOfProceedings"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_BankruptcyProceedingsDescriptionOfProceedings" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_BankruptcyProceedingsDescriptionOfProceedings" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_WarrantyOfferedOnCompletedContracts" xlink:label="sgbx_WarrantyOfferedOnCompletedContracts" xlink:title="sgbx_WarrantyOfferedOnCompletedContracts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_WarrantyOfferedOnCompletedContracts" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_WarrantyOfferedOnCompletedContracts" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:title="us-gaap_PropertyPlantAndEquipmentUsefulLife"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedTrademarksGross" xlink:label="us-gaap_FiniteLivedTrademarksGross" xlink:title="us-gaap_FiniteLivedTrademarksGross"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_FiniteLivedTrademarksGross" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_FiniteLivedTrademarksGross" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:title="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:type="arc" use="optional" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="us-gaap_AdjustmentForAmortization" xlink:title="us-gaap_AdjustmentForAmortization"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_AdjustmentForAmortization" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_AdjustmentForAmortization" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="us-gaap_ConcentrationRiskPercentage1" xlink:title="us-gaap_ConcentrationRiskPercentage1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_ConcentrationRiskPercentage1" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_ConcentrationRiskPercentage1" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NumberOfCustomers" xlink:label="sgbx_NumberOfCustomers" xlink:title="sgbx_NumberOfCustomers"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_NumberOfCustomers" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_NumberOfCustomers" xlink:type="arc" use="optional" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NumberOfVendors" xlink:label="sgbx_NumberOfVendors" xlink:title="sgbx_NumberOfVendors"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_NumberOfVendors" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_NumberOfVendors" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet" xlink:label="us-gaap_InventoryNet" xlink:title="us-gaap_InventoryNet"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_InventoryNet" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_InventoryNet" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="us-gaap_GoodwillImpairmentLoss" xlink:title="us-gaap_GoodwillImpairmentLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_GoodwillImpairmentLoss" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_GoodwillImpairmentLoss" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_ShortTermInvestments" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_ShortTermInvestments" xlink:type="arc" use="optional" order="13" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:title="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="arc" use="optional" order="14" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense" xlink:title="us-gaap_GeneralAndAdministrativeExpense"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_GeneralAndAdministrativeExpense" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_GeneralAndAdministrativeExpense" xlink:type="arc" use="optional" order="15" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherDepreciationAndAmortization" xlink:label="us-gaap_OtherDepreciationAndAmortization" xlink:title="us-gaap_OtherDepreciationAndAmortization"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_OtherDepreciationAndAmortization" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_OtherDepreciationAndAmortization" xlink:type="arc" use="optional" order="16" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCostsCurrentAndNoncurrent" xlink:label="us-gaap_DeferredCostsCurrentAndNoncurrent" xlink:title="us-gaap_DeferredCostsCurrentAndNoncurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_DeferredCostsCurrentAndNoncurrent" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_DeferredCostsCurrentAndNoncurrent" xlink:type="arc" use="optional" order="17" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCostsAndOtherAssets" xlink:label="us-gaap_DeferredCostsAndOtherAssets" xlink:title="us-gaap_DeferredCostsAndOtherAssets"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_DeferredCostsAndOtherAssets" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_DeferredCostsAndOtherAssets" xlink:type="arc" use="optional" order="18" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:label="us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:title="us-gaap_AccountsReceivableRelatedPartiesCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:type="arc" use="optional" order="19" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_LicenseConsiderationDescription" xlink:label="sgbx_LicenseConsiderationDescription" xlink:title="sgbx_LicenseConsiderationDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_LicenseConsiderationDescription" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_LicenseConsiderationDescription" xlink:type="arc" order="20" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OperatingCycleDescription" xlink:label="sgbx_OperatingCycleDescription" xlink:title="sgbx_OperatingCycleDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_OperatingCycleDescription" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_OperatingCycleDescription" xlink:type="arc" order="21" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CommonStockRemainingVestAndBeIssuedShares" xlink:label="sgbx_CommonStockRemainingVestAndBeIssuedShares" xlink:title="sgbx_CommonStockRemainingVestAndBeIssuedShares"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_CommonStockRemainingVestAndBeIssuedShares" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_CommonStockRemainingVestAndBeIssuedShares" xlink:type="arc" order="22" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionFee" xlink:label="sgbx_ConstructionFee" xlink:title="sgbx_ConstructionFee"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="sgbx_ConstructionFee" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to sgbx_ConstructionFee" xlink:type="arc" order="23" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRevenueRevenueRecognized1" xlink:label="us-gaap_DeferredRevenueRevenueRecognized1" xlink:title="us-gaap_DeferredRevenueRevenueRecognized1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_DeferredRevenueRevenueRecognized1" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_DeferredRevenueRevenueRecognized1" xlink:type="arc" use="optional" order="24" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="us-gaap_RepaymentsOfDebt" xlink:title="us-gaap_RepaymentsOfDebt"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_AccountingPoliciesTextualAbstract" xlink:to="us-gaap_RepaymentsOfDebt" xlink:title="Definition : sgbx_AccountingPoliciesTextualAbstract to us-gaap_RepaymentsOfDebt" xlink:type="arc" use="optional" order="25" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity">

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" xlink:title="Definition : us-gaap_StatementTable to us-gaap_StatementEquityComponentsAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="us-gaap_NoncontrollingInterestMember" xlink:title="us-gaap_NoncontrollingInterestMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_NoncontrollingInterestMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_NoncontrollingInterestMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ParentMember" xlink:label="us-gaap_ParentMember" xlink:title="us-gaap_ParentMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_ParentMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_ParentMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" xlink:title="us-gaap_RetainedEarningsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_RetainedEarningsMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_RetainedEarningsMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" xlink:title="us-gaap_AdditionalPaidInCapitalMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AdditionalPaidInCapitalMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_AdditionalPaidInCapitalMember" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="us-gaap_PreferredStockMember" xlink:title="us-gaap_PreferredStockMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_PreferredStockMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_PreferredStockMember" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_CommonStockMember" xlink:title="Definition : us-gaap_EquityComponentDomain to us-gaap_CommonStockMember" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:title="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" xlink:title="us-gaap_SharesOutstanding"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SharesOutstanding" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_SharesOutstanding" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:title="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCostsShares" xlink:label="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCostsShares" xlink:title="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCostsShares"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCostsShares" xlink:title="Definition : us-gaap_StatementLineItems to sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCostsShares" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCosts" xlink:label="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCosts" xlink:title="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCosts"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCosts" xlink:title="Definition : us-gaap_StatementLineItems to sgbx_StockIssuedDuringPeriodIssuanceOfCommonStockNetOfIssuanceCosts" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConversionOfDebtExchangeShare" xlink:label="sgbx_ConversionOfDebtExchangeShare" xlink:title="sgbx_ConversionOfDebtExchangeShare"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="sgbx_ConversionOfDebtExchangeShare" xlink:title="Definition : us-gaap_StatementLineItems to sgbx_ConversionOfDebtExchangeShare" xlink:type="arc" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConversionOfDebtExchangeValue" xlink:label="sgbx_ConversionOfDebtExchangeValue" xlink:title="sgbx_ConversionOfDebtExchangeValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="sgbx_ConversionOfDebtExchangeValue" xlink:title="Definition : us-gaap_StatementLineItems to sgbx_ConversionOfDebtExchangeValue" xlink:type="arc" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:label="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:title="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:type="arc" use="optional" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_StockIssuedDuringPeriodValuesReverseStockSplits" xlink:label="sgbx_StockIssuedDuringPeriodValuesReverseStockSplits" xlink:title="sgbx_StockIssuedDuringPeriodValuesReverseStockSplits"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="sgbx_StockIssuedDuringPeriodValuesReverseStockSplits" xlink:title="Definition : us-gaap_StatementLineItems to sgbx_StockIssuedDuringPeriodValuesReverseStockSplits" xlink:type="arc" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:title="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:title="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:type="arc" use="optional" order="11" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" xlink:title="us-gaap_ProfitLoss"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_ProfitLoss" xlink:title="Definition : us-gaap_StatementLineItems to us-gaap_ProfitLoss" xlink:type="arc" use="optional" order="12" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NetIncomeLossPerShareDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:title="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:title="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems to us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:title="Definition : us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable to us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="us-gaap_WarrantMember" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesNameDomain to us-gaap_WarrantMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="us-gaap_EmployeeStockOptionMember" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesNameDomain to us-gaap_EmployeeStockOptionMember" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="us-gaap_ConvertibleDebtMember" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesNameDomain to us-gaap_ConvertibleDebtMember" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_1" xlink:title="us-gaap_AntidilutiveSecuritiesNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="us-gaap_AwardTypeAxis" xlink:title="Definition : us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable to us-gaap_AwardTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" xlink:title="Definition : us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain to us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1" xlink:title="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="srt_TitleOfIndividualAxis" xlink:title="Definition : us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable to srt_TitleOfIndividualAxis" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NonEmployeesMember" xlink:label="sgbx_NonEmployeesMember" xlink:title="sgbx_NonEmployeesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_NonEmployeesMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_NonEmployeesMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NonDirectorsMember" xlink:label="sgbx_NonDirectorsMember" xlink:title="sgbx_NonDirectorsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_NonDirectorsMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_NonDirectorsMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_1" xlink:title="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NetIncomeLossPerShareTextualAbstract" xlink:label="sgbx_NetIncomeLossPerShareTextualAbstract" xlink:title="sgbx_NetIncomeLossPerShareTextualAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="sgbx_NetIncomeLossPerShareTextualAbstract" xlink:title="Definition : us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems to sgbx_NetIncomeLossPerShareTextualAbstract" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:title="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NetIncomeLossPerShareTextualAbstract" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:title="Definition : sgbx_NetIncomeLossPerShareTextualAbstract to us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/CommitmentsandContingenciesDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCommitmentsLineItems" xlink:label="us-gaap_OtherCommitmentsLineItems" xlink:title="us-gaap_OtherCommitmentsLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCommitmentsTable" xlink:label="us-gaap_OtherCommitmentsTable" xlink:title="us-gaap_OtherCommitmentsTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="us-gaap_OtherCommitmentsTable" xlink:title="Definition : us-gaap_OtherCommitmentsLineItems to us-gaap_OtherCommitmentsTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_OtherCommitmentsTable" xlink:to="srt_TitleOfIndividualAxis" xlink:title="Definition : us-gaap_OtherCommitmentsTable to srt_TitleOfIndividualAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_TetonMember" xlink:label="sgbx_TetonMember" xlink:title="sgbx_TetonMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="sgbx_TetonMember" xlink:title="Definition : srt_TitleOfIndividualWithRelationshipToEntityDomain to sgbx_TetonMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_1" xlink:title="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_OtherCommitmentsTable" xlink:to="us-gaap_SubsequentEventTypeAxis" xlink:title="Definition : us-gaap_OtherCommitmentsTable to us-gaap_SubsequentEventTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForLegalSettlements" xlink:label="us-gaap_PaymentsForLegalSettlements" xlink:title="us-gaap_PaymentsForLegalSettlements"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="us-gaap_PaymentsForLegalSettlements" xlink:title="Definition : us-gaap_OtherCommitmentsLineItems to us-gaap_PaymentsForLegalSettlements" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="us-gaap_LossContingencyDamagesSoughtValue" xlink:title="us-gaap_LossContingencyDamagesSoughtValue"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="us-gaap_LossContingencyDamagesSoughtValue" xlink:title="Definition : us-gaap_OtherCommitmentsLineItems to us-gaap_LossContingencyDamagesSoughtValue" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCommitmentsDescription" xlink:label="us-gaap_OtherCommitmentsDescription" xlink:title="us-gaap_OtherCommitmentsDescription"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="us-gaap_OtherCommitmentsDescription" xlink:title="Definition : us-gaap_OtherCommitmentsLineItems to us-gaap_OtherCommitmentsDescription" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SeveranceAmount" xlink:label="sgbx_SeveranceAmount" xlink:title="sgbx_SeveranceAmount"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="sgbx_SeveranceAmount" xlink:title="Definition : us-gaap_OtherCommitmentsLineItems to sgbx_SeveranceAmount" xlink:type="arc" order="4" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NotesPayableDetails">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotesPayableLineItems" xlink:label="sgbx_NotesPayableLineItems" xlink:title="sgbx_NotesPayableLineItems"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotesPayableTable" xlink:label="sgbx_NotesPayableTable" xlink:title="sgbx_NotesPayableTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="sgbx_NotesPayableLineItems" xlink:to="sgbx_NotesPayableTable" xlink:title="Definition : sgbx_NotesPayableLineItems to sgbx_NotesPayableTable" xlink:type="arc" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_NotesPayableTable" xlink:to="us-gaap_FinancialInstrumentAxis" xlink:title="Definition : sgbx_NotesPayableTable to us-gaap_FinancialInstrumentAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="sgbx_SecuritiesPurchaseAgreementMember" xlink:title="Definition : us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain to sgbx_SecuritiesPurchaseAgreementMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1" xlink:title="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:title="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_NotesPayableTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:title="Definition : sgbx_NotesPayableTable to us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain" xlink:title="us-gaap_RelatedPartyDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" xlink:title="Definition : us-gaap_RelatedPartyTransactionsByRelatedPartyAxis to us-gaap_RelatedPartyDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestorMember" xlink:label="us-gaap_InvestorMember" xlink:title="us-gaap_InvestorMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="us-gaap_InvestorMember" xlink:title="Definition : us-gaap_RelatedPartyDomain to us-gaap_InvestorMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_1" xlink:title="Definition : us-gaap_RelatedPartyTransactionsByRelatedPartyAxis to us-gaap_RelatedPartyDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotePayableAbstract" xlink:label="sgbx_NotePayableAbstract" xlink:title="sgbx_NotePayableAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesPayableLineItems" xlink:to="sgbx_NotePayableAbstract" xlink:title="Definition : sgbx_NotesPayableLineItems to sgbx_NotePayableAbstract" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromNotesPayable" xlink:label="us-gaap_ProceedsFromNotesPayable" xlink:title="us-gaap_ProceedsFromNotesPayable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_ProceedsFromNotesPayable" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_ProceedsFromNotesPayable" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_DebtInstrumentMaturityDate" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_DebtInstrumentMaturityDate" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable" xlink:title="us-gaap_NotesPayable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_NotesPayable" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_NotesPayable" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrent" xlink:title="us-gaap_AccruedLiabilitiesCurrent"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_AccruedLiabilitiesCurrent" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="us-gaap_ConversionOfStockSharesConverted1" xlink:title="us-gaap_ConversionOfStockSharesConverted1"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_ConversionOfStockSharesConverted1" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_ConversionOfStockSharesConverted1" xlink:type="arc" use="optional" order="4" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotePayableAbstract" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:title="Definition : sgbx_NotePayableAbstract to us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:type="arc" use="optional" order="5" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="us-gaap_DisaggregationOfRevenueLineItems" xlink:title="us-gaap_DisaggregationOfRevenueLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:title="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:title="Definition : us-gaap_DisaggregationOfRevenueLineItems to us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RevenueFromContractWithCustomerExcludingAssessedTaxPercentage" xlink:label="sgbx_RevenueFromContractWithCustomerExcludingAssessedTaxPercentage" xlink:title="sgbx_RevenueFromContractWithCustomerExcludingAssessedTaxPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="sgbx_RevenueFromContractWithCustomerExcludingAssessedTaxPercentage" xlink:title="Definition : us-gaap_DisaggregationOfRevenueLineItems to sgbx_RevenueFromContractWithCustomerExcludingAssessedTaxPercentage" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="us-gaap_DisaggregationOfRevenueTable" xlink:title="us-gaap_DisaggregationOfRevenueTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="us-gaap_DisaggregationOfRevenueTable" xlink:title="Definition : us-gaap_DisaggregationOfRevenueLineItems to us-gaap_DisaggregationOfRevenueTable" xlink:type="arc" use="optional" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DisaggregationOfRevenueTable" xlink:to="srt_ProductOrServiceAxis" xlink:title="Definition : us-gaap_DisaggregationOfRevenueTable to srt_ProductOrServiceAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GovernmentContractMember" xlink:label="us-gaap_GovernmentContractMember" xlink:title="us-gaap_GovernmentContractMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="us-gaap_GovernmentContractMember" xlink:title="Definition : srt_ProductsAndServicesDomain to us-gaap_GovernmentContractMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_HospitalityMember" xlink:label="sgbx_HospitalityMember" xlink:title="sgbx_HospitalityMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_HospitalityMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_HospitalityMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MultiFamiliesMember" xlink:label="sgbx_MultiFamiliesMember" xlink:title="sgbx_MultiFamiliesMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_MultiFamiliesMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_MultiFamiliesMember" xlink:type="arc" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalLAXLabTestingMember" xlink:label="sgbx_MedicalLAXLabTestingMember" xlink:title="sgbx_MedicalLAXLabTestingMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_MedicalLAXLabTestingMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_MedicalLAXLabTestingMember" xlink:type="arc" order="3" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalModularStructuresMember" xlink:label="sgbx_MedicalModularStructuresMember" xlink:title="sgbx_MedicalModularStructuresMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_MedicalModularStructuresMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_MedicalModularStructuresMember" xlink:type="arc" order="4" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_MedicalTestkitsMember" xlink:label="sgbx_MedicalTestkitsMember" xlink:title="sgbx_MedicalTestkitsMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_MedicalTestkitsMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_MedicalTestkitsMember" xlink:type="arc" order="5" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_OfficeMember" xlink:label="sgbx_OfficeMember" xlink:title="sgbx_OfficeMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_OfficeMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_OfficeMember" xlink:type="arc" order="6" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetailMember" xlink:label="us-gaap_RetailMember" xlink:title="us-gaap_RetailMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="us-gaap_RetailMember" xlink:title="Definition : srt_ProductsAndServicesDomain to us-gaap_RetailMember" xlink:type="arc" use="optional" order="7" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SchoolMember" xlink:label="sgbx_SchoolMember" xlink:title="sgbx_SchoolMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_SchoolMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_SchoolMember" xlink:type="arc" order="8" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_SpecialUseMember" xlink:label="sgbx_SpecialUseMember" xlink:title="sgbx_SpecialUseMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="sgbx_SpecialUseMember" xlink:title="Definition : srt_ProductsAndServicesDomain to sgbx_SpecialUseMember" xlink:type="arc" order="9" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProductAndServiceOtherMember" xlink:label="us-gaap_ProductAndServiceOtherMember" xlink:title="us-gaap_ProductAndServiceOtherMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="us-gaap_ProductAndServiceOtherMember" xlink:title="Definition : srt_ProductsAndServicesDomain to us-gaap_ProductAndServiceOtherMember" xlink:type="arc" use="optional" order="10" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NotesReceivableDetails">

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotesRecievableLineItems" xlink:label="sgbx_NotesRecievableLineItems" xlink:title="sgbx_NotesRecievableLineItems"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotesReceivableTable" xlink:label="sgbx_NotesReceivableTable" xlink:title="sgbx_NotesReceivableTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="sgbx_NotesRecievableLineItems" xlink:to="sgbx_NotesReceivableTable" xlink:title="Definition : sgbx_NotesRecievableLineItems to sgbx_NotesReceivableTable" xlink:type="arc" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" xlink:title="us-gaap_ShortTermDebtTypeAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_NotesReceivableTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" xlink:title="Definition : sgbx_NotesReceivableTable to us-gaap_ShortTermDebtTypeAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" xlink:title="us-gaap_ShortTermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" xlink:title="Definition : us-gaap_ShortTermDebtTypeAxis to us-gaap_ShortTermDebtTypeDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_CompanyNoteMember" xlink:label="sgbx_CompanyNoteMember" xlink:title="sgbx_CompanyNoteMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="sgbx_CompanyNoteMember" xlink:title="Definition : us-gaap_ShortTermDebtTypeDomain to sgbx_CompanyNoteMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_GalvinNoteMember" xlink:label="sgbx_GalvinNoteMember" xlink:title="sgbx_GalvinNoteMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="sgbx_GalvinNoteMember" xlink:title="Definition : us-gaap_ShortTermDebtTypeDomain to sgbx_GalvinNoteMember" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain_1" xlink:title="us-gaap_ShortTermDebtTypeDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain_1" xlink:title="Definition : us-gaap_ShortTermDebtTypeAxis to us-gaap_ShortTermDebtTypeDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="sgbx_NotesReceivableTable" xlink:to="us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:title="Definition : sgbx_NotesReceivableTable to us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesReceivableMember" xlink:label="us-gaap_NotesReceivableMember" xlink:title="us-gaap_NotesReceivableMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReceivableTypeDomain" xlink:to="us-gaap_NotesReceivableMember" xlink:title="Definition : us-gaap_ReceivableTypeDomain to us-gaap_NotesReceivableMember" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_NotesReceivableAbstract" xlink:label="sgbx_NotesReceivableAbstract" xlink:title="sgbx_NotesReceivableAbstract"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesRecievableLineItems" xlink:to="sgbx_NotesReceivableAbstract" xlink:title="Definition : sgbx_NotesRecievableLineItems to sgbx_NotesReceivableAbstract" xlink:type="arc" order="1" xbrldt:closed="false"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesReceivableAbstract" xlink:to="us-gaap_DebtInstrumentMaturityDate" xlink:title="Definition : sgbx_NotesReceivableAbstract to us-gaap_DebtInstrumentMaturityDate" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleOfNotesReceivable" xlink:label="us-gaap_ProceedsFromSaleOfNotesReceivable" xlink:title="us-gaap_ProceedsFromSaleOfNotesReceivable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesReceivableAbstract" xlink:to="us-gaap_ProceedsFromSaleOfNotesReceivable" xlink:title="Definition : sgbx_NotesReceivableAbstract to us-gaap_ProceedsFromSaleOfNotesReceivable" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:title="us-gaap_DebtInstrumentInterestRateStatedPercentage"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesReceivableAbstract" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:title="Definition : sgbx_NotesReceivableAbstract to us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:type="arc" use="optional" order="2" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermNonBankLoansAndNotesPayable" xlink:label="us-gaap_ShortTermNonBankLoansAndNotesPayable" xlink:title="us-gaap_ShortTermNonBankLoansAndNotesPayable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sgbx_NotesReceivableAbstract" xlink:to="us-gaap_ShortTermNonBankLoansAndNotesPayable" xlink:title="Definition : sgbx_NotesReceivableAbstract to us-gaap_ShortTermNonBankLoansAndNotesPayable" xlink:type="arc" use="optional" order="3" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConstructionBacklogTables">

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:title="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:title="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:to="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems to us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:type="arc" use="optional" order="0" xbrldt:closed="true" xbrldt:contextElement="segment"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnderlyingAssetClassAxis" xlink:label="us-gaap_UnderlyingAssetClassAxis" xlink:title="us-gaap_UnderlyingAssetClassAxis"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:to="us-gaap_UnderlyingAssetClassAxis" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable to us-gaap_UnderlyingAssetClassAxis" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnderlyingAssetClassDomain" xlink:label="us-gaap_UnderlyingAssetClassDomain" xlink:title="us-gaap_UnderlyingAssetClassDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_UnderlyingAssetClassAxis" xlink:to="us-gaap_UnderlyingAssetClassDomain" xlink:title="Definition : us-gaap_UnderlyingAssetClassAxis to us-gaap_UnderlyingAssetClassDomain" xlink:type="arc" use="optional" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ConstructionBacklogMember" xlink:label="sgbx_ConstructionBacklogMember" xlink:title="sgbx_ConstructionBacklogMember"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_UnderlyingAssetClassDomain" xlink:to="sgbx_ConstructionBacklogMember" xlink:title="Definition : us-gaap_UnderlyingAssetClassDomain to sgbx_ConstructionBacklogMember" xlink:type="arc" order="0" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnderlyingAssetClassDomain" xlink:label="us-gaap_UnderlyingAssetClassDomain_1" xlink:title="us-gaap_UnderlyingAssetClassDomain"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_UnderlyingAssetClassAxis" xlink:to="us-gaap_UnderlyingAssetClassDomain_1" xlink:title="Definition : us-gaap_UnderlyingAssetClassAxis to us-gaap_UnderlyingAssetClassDomain" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_ScheduleOfConstructionBacklogTableTextBlock" xlink:label="sgbx_ScheduleOfConstructionBacklogTableTextBlock" xlink:title="sgbx_ScheduleOfConstructionBacklogTableTextBlock"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:to="sgbx_ScheduleOfConstructionBacklogTableTextBlock" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems to sgbx_ScheduleOfConstructionBacklogTableTextBlock" xlink:type="arc" use="optional" order="1" xbrldt:closed="false"/>

<link:loc xlink:type="locator" xlink:href="sgbx-20201231.xsd#sgbx_RevenuesRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:label="sgbx_RevenuesRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:title="sgbx_RevenuesRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock"/>

<link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:to="sgbx_RevenuesRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:title="Definition : us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems to sgbx_RevenuesRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:type="arc" order="2" xbrldt:closed="false"/>

</link:definitionLink>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DocumentAndEntityInformation"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConsolidatedBalanceSheets"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConsolidatedBalanceSheetsParenthetical"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Consolidatedstatementsofcashflows"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DescriptionOfBusiness"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Liquidity"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/EmergenceFromBankruptcy"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryOfSignificantAccountingPolicies"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/AccountsReceivable"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ContractAssetsandContractLiabilities"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/PropertyPlantandEquipment"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NotesReceivable"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NotesPayable"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/BusinessCombination"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Leases"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Inventory"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConvertibleDebentures"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DebtorInPossessionFinancing"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxes"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NetIncomeLossPerShare"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConstructionBacklog"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/StockholdersEquity"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/Warrants"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensation"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/DocumentCommitmentsandContingencies"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SubsequentEvents"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesPolicies"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/EmergenceFromBankruptcyTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/AccountsReceivableTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/InventoryTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/PropertyPlantandEquipmentTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/BusinessCombinationTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LeasesTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConvertibleDebenturesTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxesTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/NetIncomeLossPerShareTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SharebasedCompensationTables"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LiquidityDetailsTextual"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/EmergencefromBankruptcyDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails1"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/SummaryofSignificantAccountingPoliciesDetails3"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/AccountsReceivableDetailsTextual"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ContractAssetsandContractLiabilitiesDetails1"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/InventoryDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/BusinessCombinationDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/BusinessCombinationDetails1"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/BusinessCombinationDetailTextual"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LeasesDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LeasesDetails1"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/LeasesDetailsTextual"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxesDetails"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxesDetails1"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/IncomeTaxesDetails2"/>

<link:definitionLink xlink:type="extended" xlink:role="http://www.sgblocks.com/role/ConstructionBacklogDetails"/>

</link:linkbase>

6 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 4/18/22  Safe & Green Holdings Corp.       10-K       12/31/21   96:12M                                    EdgarAgents LLC/FA
11/24/21  Safe & Green Holdings Corp.       424B3                  1:205K                                   EdgarAgents LLC/FA
11/18/21  Safe & Green Holdings Corp.       S-1/A                  2:312K                                   EdgarAgents LLC/FA
11/12/21  Safe & Green Holdings Corp.       S-1                    3:356K                                   EdgarAgents LLC/FA
10/26/21  Safe & Green Holdings Corp.       424B5                  1:483K                                   EdgarAgents LLC/FA
 9/22/21  Safe & Green Holdings Corp.       S-8         9/22/21    3:111K                                   EdgarAgents LLC/FA

37 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

12/10/20  Safe & Green Holdings Corp.       8-K:5,9    12/07/20    2:45K                                    EdgarAgents LLC/FA
 9/22/20  Safe & Green Holdings Corp.       8-K:1,2,9   9/17/20    2:493K                                   EdgarAgents LLC/FA
 6/25/20  Safe & Green Holdings Corp.       DEF 14A     7/30/20    1:1.7M                                   EdgarAgents LLC/FA
 5/11/20  Safe & Green Holdings Corp.       8-K:1,8,9   5/06/20    4:327K                                   EdgarAgents LLC/FA
 5/05/20  Safe & Green Holdings Corp.       S-1/A                  5:1.6M                                   EdgarAgents LLC/FA
 5/05/20  Safe & Green Holdings Corp.       S-1/A                  5:1.6M                                   EdgarAgents LLC/FA
 5/05/20  Safe & Green Holdings Corp.       8-K:1,8,9   4/30/20    5:97K                                    EdgarAgents LLC/FA
 4/03/20  Safe & Green Holdings Corp.       8-K:1,8,9   3/31/20    6:409K                                   EdgarAgents LLC/FA
 2/06/20  Safe & Green Holdings Corp.       8-K:1,2,9   2/04/20    4:112K                                   EdgarAgents LLC/FA
 2/05/20  Safe & Green Holdings Corp.       8-K:3,5,8,9 2/04/20    3:61K                                    EdgarAgents LLC/FA
 1/23/20  Safe & Green Holdings Corp.       8-K:1,9     1/21/20    4:186K                                   EdgarAgents LLC/FA
12/13/19  Safe & Green Holdings Corp.       8-K:1,8,9  12/10/19    5:394K                                   EdgarAgents LLC/FA
12/09/19  Safe & Green Holdings Corp.       S-1/A                  5:1M                                     EdgarAgents LLC/FA
11/14/19  Safe & Green Holdings Corp.       10-Q        9/30/19   66:7.8M                                   EdgarAgents LLC/FA
11/13/19  Safe & Green Holdings Corp.       8-K:1,2,3,911/07/19    7:521K                                   EdgarAgents LLC/FA
10/15/19  Safe & Green Holdings Corp.       8-K:1,9    10/09/19    4:93K                                    EdgarAgents LLC/FA
10/09/19  Safe & Green Holdings Corp.       8-K:1,2,9  10/03/19    4:330K                                   EdgarAgents LLC/FA
 8/14/19  Safe & Green Holdings Corp.       10-Q        6/30/19   67:7.4M                                   EdgarAgents LLC/FA
 7/31/19  Safe & Green Holdings Corp.       8-K:1,3,9   7/29/19    6:481K                                   EdgarAgents LLC/FA
 6/05/19  Safe & Green Holdings Corp.       8-K:5,9     6/05/19    2:37K                                    EdgarAgents LLC/FA
 5/01/19  Safe & Green Holdings Corp.       8-K:1,3,9   4/29/19    3:345K                                   EdgarAgents LLC/FA
 4/26/19  Safe & Green Holdings Corp.       8-K:1,3,8,9 4/25/19    7:728K                                   EdgarAgents LLC/FA
12/18/18  Safe & Green Holdings Corp.       S-3                    4:664K                                   EdgarAgents LLC/FA
12/17/18  Safe & Green Holdings Corp.       8-K:5,9    12/13/18    2:25K                                    EdgarAgents LLC/FA
 7/30/18  Safe & Green Holdings Corp.       8-K:5,8,9   7/24/18    2:67K                                    EdgarAgents LLC/FA
 6/05/18  Safe & Green Holdings Corp.       8-K:5,9     6/01/18    2:47K                                    EdgarAgents LLC/FA
 7/14/17  Safe & Green Holdings Corp.       8-K:1,8,9   7/12/17    3:173K                                   EdgarAgents LLC/FA
 5/12/17  Safe & Green Holdings Corp.       8-K:5,9     5/11/17    2:749K                                   EdgarAgents LLC/FA
 3/15/17  Safe & Green Holdings Corp.       S-1/A                 79:13M                                    EdgarAgents LLC/FA
 3/14/17  Safe & Green Holdings Corp.       8-K:5,9     3/10/17    4:282K                                   EdgarAgents LLC/FA
 2/28/17  Safe & Green Holdings Corp.       8-K:3,5,9   2/28/17    2:377K                                   EdgarAgents LLC/FA
 2/06/17  Safe & Green Holdings Corp.       S-1                   93:16M                                    EdgarAgents LLC/FA
11/22/16  Safe & Green Holdings Corp.       8-K:1,2,8,911/17/16    4:465K                                   EdgarAgents LLC/FA
11/01/16  Safe & Green Holdings Corp.       8-K:5,9    10/26/16    4:293K                                   EdgarAgents LLC/FA
 8/08/16  Safe & Green Holdings Corp.       8-K/A:1,2,910/15/15    5:784K                                   EdgarAgents LLC/FA
 7/07/16  Safe & Green Holdings Corp.       8-K:1,2,3,510/15/15   11:9.8M                                   EdgarAgents LLC/FA
 1/13/12  SG Blocks, Inc.                   8-K/A¶:2,9 11/04/11    3:709K                                   Olshan Frome Wolosky LLP

↑Top

Filing Submission 0001213900-21-021736 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

SG Blocks, Inc. – ‘10-K’ for 12/31/20 – ‘EX-101.DEF’

On: Thursday, 4/15/21, at 4:38pm ET · For: 12/31/20 · Accession #: 1213900-21-21736 · File #: 1-38037

Annual Report — Form 10-KFiling Table of Contents

‘EX-101.DEF’ — XBRL Definitions — sgbx-20201231_def

This Exhibit is an XBRL XML File.

6 Subsequent Filings that Reference this Filing

37 Previous Filings that this Filing References

Annual Report — Form 10-K
Filing Table of Contents