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
| 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
| 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
| 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 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| 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. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Streamlined ADU permitting process
- 2023: Expanded ADU allowance in all residential zones
- 2024: Reduced parking requirements
- 2023: Created pre-approved ADU plan library
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
Frequently Asked Questions
Can I build an ADU in Buffalo?
Yes. ADUs are allowed in Single-family residential zones in Buffalo. The maximum size for a detached ADU is 900 sq ft. No owner-occupancy is required.
How much does an ADU cost in Buffalo?
ADU construction in Buffalo typically costs $110,000-$220,000. Garage conversions run $55,000-$130,000, and prefab ADUs cost $80,000-$180,000 (installed).
How much can I rent an ADU for in Buffalo?
Average ADU rents in Buffalo are $1,100-$1,500/mo for a 1-bedroom and $1,400-$1,900/mo for a 2-bedroom unit.
Do I need parking for an ADU in Buffalo?
1 space per unit. Check with Buffalo planning department for the latest New York ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Buffalo?
The permit review timeline in Buffalo is 50-70 days. Fees range from $2,000-$3,500.
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