Build an ADU in Hebron.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Hebron — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
3 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Hebron zoning ordinance · source · 2026-07-07
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Default district — all land not in the Historic or Lake Districts (Art III C); single-family dwellings permitted in all districts (Art IV K), so this is the town's principal residential district. Town-wide setbacks (Art IV H.1): no new structure within 50 ft of the EDGE OF…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Band around Newfound Lake extending 500 ft beyond the off-lake edge of the encircling state roads (Rte 3A, North Shore Rd, West Shore Rd), plus the Spectacle Pond area (Art III B). Same town-wide dimensional standards as the Rural District: front 50 ft from edge of traveled…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 30% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Hebron village center around the Common, metes-and-bounds description on Tax Map 17 (Art III A). Same town-wide setbacks/coverage as the other districts (front 50 ft from edge of traveled way, 25 ft from any property boundary, 30% impervious coverage, 150-ft frontage, 35-ft…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Hebron 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 Hebron (Grafton County). A detached ADU can be up to 950 sf.
In Hebron's RD zone, ADUs follow the single-family setbacks: 50 ft front, 25 ft side, and 25 ft rear. Hebron has 3 zoning districts in total — see the full table below. Confirm your exact zone with the town.