Build an ADU in Sutton.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Sutton — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
2 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Sutton zoning ordinance · source · 2026-07-07
- Front
- 46.5 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Principal single-family district: single-family dwellings and accessory buildings permitted by right, and the current (2026-amended) use list adds 'Attached and Detached Accessory Dwelling Units (ADU)' as a permitted use (Art IV.A).
- Front
- 66.5 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Farming/agricultural/residential district; permits ANY use permitted in the Residential District (including single-family dwellings and, per the 2026-amended Residential use list, ADUs), plus forestry, farm stands, manufactured homes; commercial/industrial uses only by ZBA…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Sutton 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 Sutton (Merrimack County). A detached ADU can be up to 950 sf.
In Sutton's R zone, ADUs follow the single-family setbacks: 46.5 ft front, 15 ft side, and 15 ft rear. Sutton has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.