ROCHESTER, NEW HAMPSHIRE · STRAFFORD COUNTY
BUILD AN ADU IN ROCHESTER.
✓ Allowed by-right · RSA 674:71-73
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Rochester — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
Rochester setback reference · R1 zone
- Front setback
- 30 ft
- Side setback
- 20 ft
- Rear setback
- 30 ft
- Max lot coverage
- 25%
- Min lot size
- 22,500 sf (~0.52 ac)
- Max detached ADU
- 950 sf
Figures reflect Rochester's R1 residential zone and are a planning aid — your parcel's exact zone and overlays (wetland, shoreland) are verified before we lock your price.
Confirm your zoning
Rochester ADU FAQ
Can I build an ADU in Rochester, NH?
Yes. Under NH RSA 674:71-73 (HB 577), one accessory dwelling unit is allowed by-right on single-family lots statewide, including Rochester (Strafford County). A detached ADU can be up to 950 sf.
What are the ADU setbacks in Rochester?
In Rochester's R1 zone, ADUs follow the single-family setbacks: 30 ft front, 20 ft side, and 30 ft rear. Confirm your exact zone with the town.