Buffalo permits accessory dwelling units (ADUs) under the Unified Development Ordinance (UDO), known as the Green Code, codified at Chapter 496 of the Buffalo City Code. Detached, attached, and internal ADUs are recognized configurations. Applicants must obtain building, plumbing, electrical, and zoning approvals through the Department of Permit and Inspection Services and comply with the New York State Uniform Code.
Buffalo's Green Code UDO (Chapter 496, adopted December 27, 2016 and effective April 3, 2017) replaced Buffalo's 1953 zoning ordinance and accommodates ADUs as accessory residential uses. Three configurations are recognized: detached ADUs (standalone backyard structures), attached ADUs (sharing at least one wall with the primary dwelling), and internal ADUs (carved from existing space such as basements, attics, or above garages). Applications go through the City of Buffalo Department of Permit and Inspection Services (716-851-4926) via the ePermits online portal. Each ADU must comply with the New York State Uniform Fire Prevention and Building Code (19 NYCRR), including egress windows, sanitation, ventilation, smoke and CO alarm placement, and energy code requirements. Height limits in most N-zones cap ADUs at 15 feet for single-story and 30 feet for two-story structures. Typical review timelines run 60 to 90 days for a straightforward project. Lot coverage, setbacks, and parking standards vary by N-zone neighborhood district.
Constructing or occupying an ADU without permits issued by the Department of Permit and Inspection Services violates Chapter 496 and the New York State Uniform Code, triggering stop-work orders, daily fines under the city code, and required removal or legalization. Unpermitted electrical, plumbing, or gas work can void homeowner insurance coverage. Failure to obtain a certificate of occupancy prevents lawful habitation of the unit.
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