ADU · Erie County
Can you build an ADU in Buffalo, NY?
City of Buffalo has 4 districts. All districts allow ADUs. Check your address to confirm the district that applies to your parcel:
What the Buffalo code indicates by district
The table below shows how each district treats ADUs, alongside the lot and setback standards that govern a second unit. District boundaries and conditions vary, so treat this as a starting point and confirm the district that applies to your parcel.
| District | Min lot | Setbacks F / S / R | Max height | ADU |
|---|---|---|---|---|
| N-2R Residential | 0.034 ac | - / 3 / - ft | 40 ft | As of right |
| N-3R Residential | 0.041 ac | - / 3 / - ft | 40 ft | As of right |
| N-4-30 Single-Family | 0.055 ac | - / 3 / - ft | 40 ft | As of right |
| N-4-50 Single-Family | 0.092 ac | - / 6 / - ft | 40 ft | As of right |
ADUs vs. short-term rentals in Buffalo
Short-term rentals allowed with local rules for City of Buffalo. Short-term rentals require a City license and certificate under Chapter 380, Short-Term Rental Housing, adopted 2-20-2024. § 380-7 requires both a short-term rental license and a certificate; §§ 380-16 through 380-18 govern issuance, denial and revocation, and § 380-21 the revocation procedure. Separate obligations sit in Chapter 264 (rental dwelling unit registration) and Chapter 269 (lodging houses). New York State's 2025 short-term rental registry (Ch. 99 of the Laws of 2025) separately requires every host statewide to register the unit regardless of local law. Confirm with City of Buffalo at (716) 851-4949 before listing. These are separate questions from whether you can build an ADU — a unit you're allowed to add isn't automatically one you're allowed to rent nightly, so check both.
Good to know
- Residential lot minimum0.034–0.092 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityNational Grid territory.
- Building dept(716) 851-4949
- Last reviewed2026-08-06
ADU FAQ — Buffalo, NY
Are ADUs allowed in Buffalo, NY?
City of Buffalo has 4 districts. All districts allow ADUs. Check your address with the free ADU checker, or confirm with the building department at (716) 851-4949.
Do I need a special permit for an ADU in Buffalo?
No district in City of Buffalo requires a special-use permit for an ADU - 4 districts allow ADUs. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Buffalo?
Short-term rentals allowed with local rules for City of Buffalo. ADU occupancy and short-term-rental rules are separate: an ADU you can build isn't automatically one you can rent nightly. Confirm both before you count on STR income.
What an ADU costs to build in Buffalo
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $200k–260k at a standard finish, and the per-square-foot rate comes in above a full house because the kitchen, bath, panel and heating plant cost the same either way. See the full cost to build an ADU in Buffalo, priced by size.
More on Buffalo: Full zoning for new construction · ADU build cost · House build cost · All Erie County towns
ADU information for City of Buffalo is compiled from the municipal code (last reviewed 2026-08-06) and provided for decision-support only — not legal or architectural advice. ADU eligibility, size, owner-occupancy and permit conditions vary by district and often carry exceptions; verify with the building department at (716) 851-4949 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.