New York City allows one ADU of up to 800 square feet on a qualifying one- or two-family property in eligible low-density areas, but the owner must occupy the property and obtain DOB approval.
Flood-hazard, historic, contextual, property-type, unit-count, code, egress, utility, and legalization conditions can make a specific property ineligible.
What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedNYC DOB accessory dwelling units
Next stepCheck parcel rules and project scope before design, purchase, or contractor conversations.
Citywide frameworkOne ADU up to 800 sq ft on a qualifying one- or two-family property in eligible low-density areas
Owner and permitOwner occupancy and DOB approval required
Still verifyFlood, historic/contextual, property type, unit count, egress, utilities, and building-code conditions