Build an ADU in Sugar Hill.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Sugar Hill — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
4 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Sugar Hill zoning ordinance · source · 2026-07-07
- Front
- 75 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Town's principal residential district, centered on the areas of Sugar Hill where the greatest amount of development has already taken place (Sec 304.1 Objective). Permitted use #1 is 'Single-family dwelling with or without a single accessory dwelling unit.' Minimum lot size…
- Front
- 75 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Primarily residential rural district, accessible but with roads not suited to heavy use (Sec 304.2 Objective). Permitted use #1 is 'Single-family dwelling with or without a single accessory dwelling unit.' Minimum lot size 3.0 acres = 130,680 sf (for all uses except…
- Front
- 75 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Remote rural district where access is relatively difficult, generally not served by roads; large undeveloped tracts suited to agriculture and forestry (Sec 304.3 Objective). Permitted use #1 is 'Single-family dwelling with or without a single accessory dwelling unit.' Minimum…
- Front
- —
- Side
- —
- Rear
- 75 ft
- Max coverage
- —
- Min lot
- —
Environmental OVERLAY district superimposed over the base zoning districts, extending 150 ft inland from the normal high-water level of all lakes/ponds over 10 acres and the Gale River (Sec 304.4). It does NOT set its own base lot size or single-family setbacks: minimum lot…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Sugar Hill 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 Sugar Hill (Grafton County). A detached ADU can be up to 950 sf.
In Sugar Hill's GR zone, ADUs follow the single-family setbacks: 75 ft front, 25 ft side, and 25 ft rear. Sugar Hill has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.