Exhibit 23.1

Independent Registered Public Accounting Firm’s Consent

We consent to the inclusion in this Registration Statement of SG Blocks, Inc. and Subsidiaries (Debtor in Possession) (Predecessor Company) on Amendment No. 4 to Form S-1 (File No. 333-215922) of our report dated July 21, 2016, which includes an explanatory paragraph as to the Company’s ability to continue as a going concern, with respect to our audit of the consolidated financial statements of as of December 31, 2015 and for the year then ended, which report appears in the Prospectus, which is part of this Registration Statement. We also consent to the reference to our Firm under the heading “Experts” in such Prospectus.

/s/ Marcum llp

New York, NY

June 2, 2017