ADU rules in Buffalo, NY — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Buffalo Unified Development Ordinance (Green Code) permits accessory dwelling units (ADUs) in most residential zones. ADUs must be on lots at least 2,500 sq ft, occupy no more than 800 sq ft, and meet parking and design standards. Owner-occupancy of the primary dwelling is required.
The Buffalo Green Code (Unified Development Ordinance, adopted 2017) allows accessory dwelling units in N-1D, N-2R, N-2C, and N-3R zones, among others, either attached (in-law suite, basement apartment) or detached (backyard cottage). Standards include: maximum 800 square feet or 33 percent of the primary dwelling (whichever is less), minimum lot area of 2,500 sq ft, one off-street parking space for the ADU (waivable in walkable districts), and compliance with NY State Building Code for habitable space. The primary dwelling must remain owner-occupied. Garage conversions are permitted when they meet egress, ceiling height, and insulation requirements. ADUs cannot be used as short-term rentals.
Unpermitted ADU construction: stop-work order plus fines up to 500 dollars per day. STR use of an ADU triggers separate short-term-rental penalties.
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See how Buffalo's adu rules rules stack up against other locations.
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