Garage conversion rules in New York, NY — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage-to-living-space conversions in Manhattan require a DOB alteration permit, zoning compliance, and Multiple Dwelling Law review. Most Manhattan properties lack private garages, making this rare.
Garage conversions are uncommon in New York County (Manhattan) because most residential properties do not have private garages. Where they exist, typically in townhouses in historic districts or in low-density northern Manhattan neighborhoods, converting garage space to habitable living space requires a NYC Department of Buildings Alt-1 or Alt-2 alteration permit, compliance with the NYC Zoning Resolution regarding floor area ratio and dwelling unit count, and review under the Multiple Dwelling Law if the conversion creates a new unit. Habitable space must meet NYC Building Code requirements for minimum ceiling height (typically 8 feet), natural light and ventilation, egress, and insulation. If the building is within a Landmarks Preservation Commission historic district, exterior changes such as replacing a garage door with windows require LPC approval. Off-street parking requirements under ZR Article II must be verified before reducing parking capacity. Contact DOB for a pre-filing consultation.
Contact your local code enforcement office for specific penalty information.
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