Build an ADU in Danville.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Danville — 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 Danville zoning ordinance · source · 2026-07-07
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
PRIMARY district: defined as all areas of town not in another district (Art III.F), i.e. Dimensional standards are TOWN-WIDE from Article VI, not a district table: min lot 2 acres (87,120 sf) with 200 ft frontage on a Class I-V highway, and the dwelling must sit on a…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Mixed residential/limited-commercial district along the Main Street corridor (added 3/11/2008). Min lot area 2 acres (87,120 sf); min frontage 200 ft Max height 2.5 stories or 35 ft No percentage lot-coverage cap, but a FLOOR-AREA limit applies (IV.B.3.b): the gross…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Commercial/light-industrial district along the Route 111 corridor (mapped, Art III.C). District dimensional rules (IV.C.2.a-b): min lot 2 acres (87,120 sf) with 200 ft frontage on Route 111 or a Class I-V highway; buildings at least 30 ft from any public street EXCEPT along…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Mapped district (Art III.D). Individual mobile-home lots must comply with Articles VI and VIII (IV.D.2.b): min lot 2 acres (87,120 sf), side/rear 15 ft from abutter's property line, front 30 ft from edge of right-of-way (or lesser neighborhood average).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Danville 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 Danville (Rockingham County). A detached ADU can be up to 950 sf.
In Danville's RA zone, ADUs follow the single-family setbacks: 30 ft front, 15 ft side, and 15 ft rear. Danville has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.