Build an ADU in Westmoreland.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Westmoreland — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
5 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Westmoreland zoning ordinance · source · 2026-07-07
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 15% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Principal residential district: the ordinance states MDR 'is intended to house the majority of the community's permanent residents' where central water/sewer are not available but could become feasible (sec 3.2.C).
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 15% impervious
- Min lot
- 217,800 sf (~5.00 ac)
Low-density district limited to agricultural, forestry and other non-intensive uses plus low-density residential; density one family per 5 acres (sec 3.2.D). Minimum lot size 5 acres (217,800 sf); frontage 500 ft; depth 200 ft Front yard 50 ft, each side yard 20 ft, rear 20…
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 15% impervious
- Min lot
- 435,600 sf (~10.00 ac)
Open-space / conservation district for forested and scenic areas unserved by adequate facilities; maximum density one family per 10 acres (sec 3.2.E). Minimum lot size 10 acres (435,600 sf); frontage 500 ft; depth 400 ft Front yard 50 ft, each side yard 20 ft, rear 20 ft Max…
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 25% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Village-center district in sub-community centers, New England mixed-use character; residential density one family per acre (sec 3.2.B). Permitted uses include one-family dwelling, two-family dwelling (one acre per unit), and home-based occupation; various…
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 75% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Manufacturing / commercial employment district (sec 3.2.A); site plan approval required for any use beyond one-family residential. A one-family dwelling here must meet the Rural Residential (Table 3.5.4) area/dimension requirements per the C/I use table, but the district's…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Westmoreland 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 Westmoreland (Cheshire County). A detached ADU can be up to 950 sf.
In Westmoreland's MDR zone, ADUs follow the single-family setbacks: 50 ft front, 20 ft side, and 20 ft rear. Westmoreland has 5 zoning districts in total — see the full table below. Confirm your exact zone with the town.