Build an ADU in Landaff.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Landaff — 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 Landaff zoning ordinance · source · 2026-07-07
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 90,000 sf (~2.07 ac)
Default district: all land in town except the Commercial strip along Route 302 (Article 6). Dimensional standards are TOWN-WIDE (Article 7, applies to every lot regardless of district): min lot 90,000 sf (Sec 701); frontage 250 ft on a state or town road (Sec 702); FRONT…
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 90,000 sf (~2.07 ac)
All land within 800 ft south of the centerline of Route 302 from the Lisbon town line west to Mill Brook Road (Article 6). Same town-wide Article 7 dimensional standards as Rural Residential: min lot 90,000 sf, frontage 250 ft, front 25 ft from ROW edge, side/rear 25 ft,…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Landaff 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 Landaff (Grafton County). A detached ADU can be up to 950 sf.
In Landaff's RR zone, ADUs follow the single-family setbacks: 25 ft front, 25 ft side, and 25 ft rear. Landaff has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.