Build an ADU in Wilmot.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Wilmot — 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 Wilmot zoning ordinance · source · 2026-07-07
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
The Residential District comprises the ENTIRE town except the two Village Districts and two Commercial Districts (Art II Sec II) — this is the default district for nearly all Wilmot parcels. Front setback: every new building/structure not less than 30 ft from the FRONT…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
Two mapped village areas: Wilmot Center (bands ~500 ft off the Route 4-A centerline between Patterson Rd and Granite Hill Rd) and Wilmot Flat (~500 ft off Village Rd at Route 11) (Art II Sec III). Min lot: 1 acre (43,560 sf) with at least 100 ft frontage on a Class V road or…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Two mapped areas along NH Route 11 near the New London line: Commercial District I (Pine Hill Rd / Joy Rd area) and Commercial District II (Kearsarge Valley Rd to Old Winslow Rd, 1,200 ft off the Route 11 centerline) (Art II Sec IV).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
OVERLAY, not a base district — applies to all areas of town with natural slopes over 15% (mapped at axisgis.com/wilmotnh). Slopes >25%: NO development of any kind (buildings, driveways, septic, wells, roads); only forestry, wildlife/conservation, open space/recreation.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Wilmot 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 Wilmot (Merrimack County). A detached ADU can be up to 950 sf.
In Wilmot's R zone, ADUs follow the single-family setbacks: 30 ft front, 15 ft side, and 10 ft rear. Wilmot has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.