Build an ADU in Roxbury.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Roxbury — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
2 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Roxbury zoning ordinance · source · 2026-07-07
- Front
- 35 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 65,340 sf (~1.50 ac)
Primary residential district; permitted use is single- or two-unit dwellings incl private garages and accessory buildings (Art IV.A.1). Dimensional rule (Art IV.B.1): no structure closer than 35 ft from the FRONTAGE, nor closer than 20 ft from the side and rear property line,…
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 435,600 sf (~10.00 ac)
Covers all areas of Town outside the Residential District (Art II.B.2). Dimensional rule (Art V.B.1): no structure closer than 50 ft from the frontage, nor closer than 50 ft from the side and rear property lines, AND no closer than 150 ft from any existing dwelling on…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Roxbury 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 Roxbury (Cheshire County). A detached ADU can be up to 950 sf.
In Roxbury's Residential District zone, ADUs follow the single-family setbacks: 35 ft front, 20 ft side, and 20 ft rear. Roxbury has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.