NYC passed Local Law 126 in December 2024 to let homeowners legalize their illegal basement apartments. But the program requires posting an 8-foot red sign outside your door during construction, compliance costs can run $50,000 to $100,000 or more, and the 2019 pilot program that preceded it legalized zero units. The Mamdani administration reopened financing for the Plus One ADU grant program in March 2026, offering up to $125,000 per homeowner for design, permitting, and construction of a new ADU, with applications accepted through June 12, 2026.
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