Build an ADU in Colebrook.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Colebrook — 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 Colebrook zoning ordinance · source · 2026-07-07
- Front
- 20 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
One of the town's two zoning districts (Art II). OUTLYING is defined as 'that area of Colebrook that is neither served by municipal water nor within the Colebrook Village Fire Precinct' (Art III) — the rural, no-utilities tier, so it is the conservative choice and the…
- Front
- 20 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- —
The town's other zoning district (Art II), covering the developed village core. PRECINCT is defined as 'that area of Colebrook that is served by municipal water and/or within the Colebrook Village Fire Precinct' (Art III) — the served/utilities tier.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Colebrook 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 Colebrook (Coös County). A detached ADU can be up to 950 sf.
In Colebrook's Outlying zone, ADUs follow the single-family setbacks: 20 ft front, 10 ft side, and 10 ft rear. Colebrook has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.