Build an ADU in Acworth.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Acworth — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
4 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Acworth zoning ordinance · source · 2026-07-07
- Front
- 40 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
Town's principal single-family residential district; permitted use is single-family dwellings with private garages and accessory buildings (Art IV.A.1). Lot area not less than 40,000 sf, frontage not less than 200 ft (Art IV.B.1).
- Front
- 40 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Catch-all district: comprises all Town lands not in the Residential or Crescent Lake Districts (Art V.C). Lot area not less than 3 acres (130,680 sf) with minimum frontage 300 ft (Art V.B.1). Front setback 40 ft from the nearest edge of the abutting right-of-way; side and…
- Front
- 40 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
Lakeside residential district protecting Crescent Lake (boundary: all property north of a line 200 ft south of the southern edge of Crescent Lake Road ROW, Hwy 51; Art VI.C). Lot area not less than 40,000 sf, frontage not less than 200 ft (Art VI.B.1).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay zone, NOT a base lot-creating district: except for Crescent Lake shorelands (governed by Art VI), it overlays all stream banks and the shores of all natural ponds and lakes to 100 ft from the maximum high-water level (Art VII.C).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Acworth 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 Acworth (Sullivan County). A detached ADU can be up to 950 sf.
In Acworth's Residential zone, ADUs follow the single-family setbacks: 40 ft front, 20 ft side, and 20 ft rear. Acworth has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.