Build an ADU in North Hampton.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in North Hampton — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
3 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official North Hampton zoning ordinance · source · 2026-07-06
- Front
- 30 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 35% lot
- Min lot
- 87,120 sf (~2.00 ac)
Primary single-family residential district (also allows one duplex per lot). Max lot coverage 35% for lots under 2 acres, 25% for lots 2 acres or larger. Min frontage 175 ft Side/rear setbacks shown are for principal structures; accessory-structure side/rear setbacks vary by…
- Front
- 35 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 35% lot
- Min lot
- 87,120 sf (~2.00 ac)
Medium-to-large single-family dwellings (one single-family residence per lot); on-site well/septic where central water/sewer not available. Max lot coverage 35% for lots under 2 acres, 25% for lots 2 acres or larger.
- Front
- 50 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- 75% lot
- Min lot
- 87,120 sf (~2.00 ac)
Business, light-industrial and certain residential uses (a given lot is used for either business or residential, not both, per 203.8). Min frontage 250 ft Requires a 10-ft-wide landscaped perimeter buffer (203.11).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
North Hampton ADU FAQ
Yes. Under NH RSA 674:71-73 (HB 577), one accessory dwelling unit is allowed by-right on single-family lots statewide, including North Hampton (Rockingham County). A detached ADU can be up to 950 sf.
In North Hampton's R-1 zone, ADUs follow the single-family setbacks: 30 ft front, 25 ft side, and 25 ft rear. North Hampton has 3 zoning districts in total — see the full table below. Confirm your exact zone with the town.