Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Apr. 11, 2022
Jun. 30, 2021
Document and Entity Information [Abstract]      
Entity Registrant Name SG BLOCKS, INC.    
Entity Central Index Key 0001023994    
Trading Symbol SGBX    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Filer Category Non-accelerated Filer    
Entity Incorporation, State or Country Code DE    
Entity Address, State or Province FL    
Entity Address, Address Line One 5011 Gate Parkway,    
Entity Address, Address Line Two Building 100, Suite 100    
Entity Address, City or Town Jacksonville    
Entity Address, Postal Zip Code 32256    
City Area Code (646)    
Local Phone Number 240-4235    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
Entity File Number 001-38037    
Entity Tax Identification Number 95-4463937    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Public Float     $ 48,471,319
Entity Common Stock, Shares Outstanding   12,006,873  
Auditor Name Whitley Penn LLP    
Auditor Firm ID 726    
Auditor Location Dallas, Texas