Buffalo is increasingly ADU-friendly as part of its infill housing strategy. The city allows accessory units in most residential zones with reasonable regulations and lower property costs than many competing markets.
Zoning & Size Requirements [1]
| Allowed Zones | Single-family residential zones |
| Max Size (Detached) | 900 sq ft |
| Max Size (Attached) | 800 sq ft |
| Max Size (JADU) | Not allowed |
| Max Height | 30 feet |
| Max Units | 1 ADU per lot |
Setback Requirements [1]
| Rear Setback | 15 feet |
| Side Setback | 5 feet |
| Front Setback | 20 feet |
| Parking Required | 1 space per unit |
| Owner Occupancy | Not required |
| Min Lot Size | 4,500 sq ft |
Permit Process & Fees
| Approval Process | Building permit |
| Review Timeline | 50-70 days |
| Permit Fees | $2,000-$3,500 |
| Impact Fees | $500-$1,000 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Available for select types |
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Construction Costs [2][3]
| Average Build Cost | $110,000-$220,000 |
| Cost per Sq Ft | $120-$250 |
| Garage Conversion | $55,000-$130,000 |
| Prefab ADU (Installed) | $80,000-$180,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [4][5]
| Avg Rent (1 Bedroom) | $1,100-$1,500/mo |
| Avg Rent (2 Bedroom) | $1,400-$1,900/mo |
| Short-Term Rental | Limited |
| Est. Annual ROI | 8-12% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- NYC Local Laws 126 & 127 (Dec 2024): ADUs now allowed in 1-2 family homes citywide
- NYC basement apartment legalization program accepting applications (2026)
- Buffalo expanded ADU zones to include R-2 and R-3 districts (2026)
- NY State considering statewide ADU legislation modeled on CA and MA laws
Tips for Building an ADU in Buffalo
- Buffalo's affordable property market creates excellent cash flow potential
- Economic revitalization efforts support long-term value appreciation
- Lower construction costs mean faster break-even timeline
- Regional stability with university and medical institutions
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Buffalo Green Code (UDO) — City of Buffalo Planning Department — Accessed 2026-02-24
- HomeAdvisor — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- ADU Program — Buffalo Urban Renewal Agency Planning Department — Accessed 2026-02-24
- New York State ADU Legislation Overview Government Data — Accessed 2026-02-24
Frequently Asked Questions
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