Build an ADU in Ossipee.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Ossipee — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
7 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Ossipee zoning ordinance · source · 2026-07-07
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 25% impervious
- Min lot
- 44,000 sf (~1.01 ac)
Front may reduce to street-line average. Frontage 200 ft.
- Front
- 10 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 50% impervious
- Min lot
- 10,000 sf (~0.23 ac)
Frontage 80 ft.
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 40% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Frontage 200 ft.
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 50% impervious
- Min lot
- 44,000 sf (~1.01 ac)
Frontage 200 ft.
- Front
- 10 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 50% impervious
- Min lot
- 10,000 sf (~0.23 ac)
Frontage 80 ft.
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 25% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Frontage 200 ft.
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- 25% impervious
- Min lot
- 87,120 sf (~2.00 ac)
2 acres. Frontage 200 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.
Ossipee 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 Ossipee (Carroll County). A detached ADU can be up to 950 sf.
In Ossipee's RES zone, ADUs follow the single-family setbacks: 40 ft front, 25 ft side, and 25 ft rear. Ossipee has 7 zoning districts in total — see the full table below. Confirm your exact zone with the town.