Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 2,082,825	$ 1,394,952	$ 5,932,150	$ 3,001,279
Cost of revenue:
Cost of revenue	1,857,985	1,297,055	5,512,140	2,604,366
Gross profit	224,840	97,897	420,010	396,913
Operating expenses:
Payroll and related expenses	611,906	749,407	1,589,935	1,385,005
General and administrative expenses	557,078	324,794	1,538,441	1,048,853
Marketing and business development expense	133,378	56,343	311,965	122,529
Pre-project expenses		11,657	49,964	28,304
Total	1,302,362	1,142,201	3,490,305	2,584,691
Operating loss	(1,077,522)	(1,044,304)	(3,070,295)	(2,187,778)
Other income (expense):
Interest expense				(330,388)
Interest income		3		11
Other income		1,000	5,768	1,000
Loss on debt conversion				(1,018,475)
Change in fair value of financial instruments				96,327
Loss from equity affiliates	(960)		(960)
Total	(960)	1,003	4,808	(1,251,525)
Loss before income taxes	(1,078,482)	(1,043,301)	(3,065,487)	(3,439,303)
Income tax expense
Net loss	(1,078,482)	(1,043,301)	(3,065,487)	(3,439,303)
Less: Net loss attributable to non-controlling interests	(52,445)		(52,445)
Net loss attributable to common stockholders of SG Blocks, Inc.	$ (1,026,037)	$ (1,043,301)	$ (3,013,042)	$ (3,439,303)
Net loss per share attributable to SG Blocks, Inc. - basic and diluted:
Basic and diluted	$ (0.24)	$ (0.25)	$ (0.71)	$ (2.09)
Weighted average shares outstanding:
Basic and diluted	4,260,041	4,177,890	4,260,041	1,647,916
Block sales
Revenue:
Revenue			$ 42,799
Cost of revenue:
Cost of revenue			33,084
Construction services
Revenue:
Revenue	2,033,769	1,326,005	5,307,168	2,728,462
Cost of revenue:
Cost of revenue	1,764,030	1,242,113	5,056,971	2,375,139
Engineering services
Revenue:
Revenue	49,056	68,947	582,183	272,817
Cost of revenue:
Cost of revenue	$ 93,955	$ 54,942	$ 422,085	$ 229,227