Build an ADU in Richmond.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Richmond — 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 Richmond zoning ordinance · source · 2026-07-07
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Primary district; covers all town areas not in another district (sec 202.1.A). Front setback 50 ft measured from the EDGE OF THE PUBLIC RIGHT-OF-WAY, not centerline (sec 405.2). Minimum lot size 3 acres = 130,680 sf (sec 405.4); flat requirement with no public-utility tiering…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Single-family residential district within 525 ft (horizontal distance) of the high-water mark of Cass Pond, Sandy Pond, or any other water body over ten acres (sec 202.1.B). No building nearer than 25 ft to an abutter's property line (side/rear), 50 ft from the edge of the…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
District covering the center of town to preserve rural character (sec 202.1.E, 801). Permitted uses and standards are the SAME as the Residential District unless otherwise restricted or permitted in this article (sec 802); the article states no separate dimensional table, so…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
A single-parcel spot district consisting SOLELY of Map 201, Lot 56 — the 0.86-acre Four Corners Store property — established March 8, 2016 to allow a general store and gas station (sec 803).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
No Industrial District is presently delineated or in effect.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Richmond 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 Richmond (Cheshire County). A detached ADU can be up to 950 sf.
In Richmond's Residential zone, ADUs follow the single-family setbacks: 50 ft front, 25 ft side, and 25 ft rear. Richmond has 5 zoning districts in total — see the full table below. Confirm your exact zone with the town.