Accessory Structures in New York, NY (2026)
7 verified accessory structures rules for New York, New York, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
New York City legalized ADUs on one- and two-family lots in December 2024 through Local Law 126 of 2024 (basement/cellar legalization pilot) and Local Law 127 of 2024 (new ADU standards), enacted alongside the City of Yes for Housing Opportunity zoning text amendment. ADUs are capped at 800 square feet of zoning floor area, limited to one ADU per lot, and require owner-occupancy on the same lot. Backyard ADUs are prohibited in FEMA Special Flood Hazard Areas, DEP 10-Year Rainfall Flood Risk Areas, historic districts, and certain low-density zones (R1-2A, R2A, R3A) outside the Greater Transit Zone.
New York City Accessory Dwelling Unit (ADU) Rules
Some RestrictionsADU Permits
New York City does not have a general-purpose ADU ordinance. Most accessory dwelling units, including basement and cellar apartments, remain illegal under the NYC Zoning Resolution and NYC Building Code, except under the Local Law 22 of 2024 basement and cellar conversion pilot in specific community districts.
New York City ADU Permit Restrictions
Heavy RestrictionsADU Impact Fees
New York City does not charge impact fees on accessory dwelling units because it has no general ADU ordinance. Local Law 22 of 2024 pilot conversions pay standard DOB and HPD filing, plan-exam, and inspection fees only, with no school, park, or transportation impact fees.
New York City ADU Fee Framework
Some RestrictionsADU Owner Occupancy
The Local Law 22 of 2024 basement and cellar legalization pilot requires the owner to occupy the building as a primary residence at the time of application. Outside the pilot, NYC has no ADU framework, so owner-occupancy rules don't apply.
New York City Basement Conversion Owner-Occupancy
Heavy RestrictionsADU Rental Restrictions
Local Law 18 of 2022 (NYC short-term rental registration) prohibits short-term rentals in any dwelling unit unless the host is present and the unit is registered with the Mayor's Office of Special Enforcement. ADUs and basement units are not eligible for STR registration.
New York City ADU and Basement Rental Rules
Heavy RestrictionsCarport Rules
Carports in NYC require DOB permits and must comply with the Zoning Resolution's setback, lot coverage, and open space requirements. In most residential districts, carports count as lot coverage and must meet side and rear yard setbacks. Building Code structural requirements apply.
New York City Carport Regulations
Some RestrictionsTiny Homes
Tiny homes face significant regulatory barriers in NYC. The Building Code sets minimum room sizes (120 sq ft for a living room, 80 sq ft for a bedroom). The Zoning Resolution generally does not permit standalone dwelling units on lots zoned for single-family use. Tiny homes on wheels are classified as vehicles and cannot serve as permanent dwellings.
New York City Tiny Home Regulations
Heavy RestrictionsLooking for New York County county-wide rules?
County ordinances apply to unincorporated areas and may supplement New York city rules.
Accessory Structures in New York County →