Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 25, 2012
Jun. 30, 2011
Document and Entity Information [Abstract]      
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 373,613
Entity Common Stock, Shares Outstanding   39,779,506  
Entity Registrant Name SG BLOCKS, INC.    
Entity Central Index Key 0001023994    
Amendment Flag false    
Document Type 10-K    
Document Period End Date Dec. 31, 2011    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company