Build an ADU in Sandwich.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Sandwich — 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 Sandwich zoning ordinance · source · 2026-07-06
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 100,000 sf (~2.30 ac)
Primary single-family / two-family residential district; per Sec 150-9.A it covers all land NOT within the Village or Commercial districts. Principal-structure & Detached ADU setbacks (Sec 150-13.C): 75 ft from the centerline of any road/street, OR 50 ft from any lot…
- Front
- 15 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 50% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Center Sandwich village district: all land within 500 ft of the centerline of the listed village roads (Sec 150-9.B), intended to retain the compact historic village character. Principal-structure & Detached ADU setbacks (Sec 150-130.C): 35 ft from the centerline of any…
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 100,000 sf (~2.30 ac)
Commercial corridor along Whittier Highway (Route 25): land within 2,000 ft of the centerline of listed Route 25 segments plus specified tax-map lots (Sec 150-9.C). Dimensionally CD is governed by the SAME Article III standards as RR: same principal-structure setbacks (Sec…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Sandwich 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 Sandwich (Carroll County). A detached ADU can be up to 950 sf.
In Sandwich's RR zone, ADUs follow the single-family setbacks: 50 ft front, 50 ft side, and 50 ft rear. Sandwich has 3 zoning districts in total — see the full table below. Confirm your exact zone with the town.