Build an ADU in Salisbury.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Salisbury — 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 Salisbury zoning ordinance · source · 2026-07-07
- Front
- 75 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Principal residential district: low-to-moderate-density housing on private well/septic, mapped as 300-ft-deep corridors along listed state and town roads (Art VI.A). FRONT SETBACK IS MEASURED FROM THE ROAD CENTERLINE: all structures must be at least 75 ft from the centerline…
- Front
- 75 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Mixed-use village district (residential, civic, retail, commercial) along US 4 / Old Coach Rd / Rte 127 / Rabbit Rd corridors, 300 ft deep from road centerlines (Art VI.B). Shares the same Table 2 dimensional column as Residential and Agricultural: 2-acre min lot, 200 ft…
- Front
- 75 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Default district covering all land not in the Residential or Retail Village districts — the bulk of the town (Art VI.C). Same shared Table 2 standards: 2-acre (87,120 sf) min buildable lot, 200 ft frontage, front 75 ft from town/subdivision/private road centerline and 100 ft…
- Front
- 75 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 50% impervious
- Min lot
- 30,000 sf (~0.69 ac)
VOLUNTARY overlay on listed lots in the US 4 / NH 127 'Crossroads' area (Tax Maps 244, 245, 257); it does not remove or alter underlying-district rights, and review under it is optional unless the site was previously approved as a VCOD development (Art VI.D.2).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Salisbury 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 Salisbury (Merrimack County). A detached ADU can be up to 950 sf.
In Salisbury's R zone, ADUs follow the single-family setbacks: 75 ft front, 35 ft side, and 35 ft rear. Salisbury has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.