Zoning & Size Limits
| Requirement | Rochester, NY | New York City, NY |
|---|
| Allowed Zones | Single-family residential | R1-R5 residential zones (NOT R1A, R2A, R3A unless in Greater |
| Max Size (Detached) | 850 sq ft | Up to 800 sq ft (and no more than 33% of the required rear yard) where permitted under City of Yes; not allowed in historic districts or R1A/R2A/R3A zones outside the Greater Transit Zone |
| Max Size (Attached) | 750 sq ft | 800 sq ft |
| Max Height | 35 feet | 15 ft (detached, zero lot line, or semi-detached A |
| Parking Required | 1 space per unit | Not required |
| Owner Occupancy | Confirm with City of Rochester Bureau of Zoning — sources co | Owner must occupy either the primary home or the ADU |
Setback Requirements
| Setback | Rochester, NY | New York City, NY |
|---|
| Rear Setback | 15 feet | N/A |
| Side Setback | 5 feet | N/A |
| Front Setback | 20 feet | N/A |
Permits & Timeline
| Detail | Rochester, NY | New York City, NY |
|---|
| Permit Timeline | 50-70 days | 120-180 days |
| Permit Fees | $1,900-$3,300 | $5,000-$10,000 |
| Impact Fees | $400-$900 | Varies by borough |
| Pre-Approved Plans | Limited availability | Yes — DOB/HPD Pre-Approved ADU Plan Library launch |
Construction Costs
| Cost | Rochester, NY | New York City, NY |
|---|
| Avg Build Cost | $105,000-$210,000 | $150,000-$300,000 |
| Cost Per Sq Ft | $125-$250 | $300-$600 |
| Garage Conversion | $50,000-$120,000 | $120,000-$260,000 |
| Prefab ADU | $75,000-$170,000 | Rarely feasible (site access/crane limits) |
Rental Income Potential
| Rental | Rochester, NY | New York City, NY |
|---|
| 1BR Avg Rent | $1,050-$1,450/mo | $2,200-$3,200/mo |
| 2BR Avg Rent | $1,350-$1,850/mo | $2,800-$4,200/mo |
| Short-Term Rentals | Not typically permitted | Heavily restricted (primary unit rule) |
| Est. ROI | 8-12% annual return | 4-6% annual return |
Which City Is Better for ADUs?
Rochester scores 6/10 while New York City scores 5/10 on our ADU-friendliness index.
Rochester edges ahead overall. Both cities offer viable ADU development opportunities — the best choice depends on your specific property, budget, and goals.
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