Build an ADU in Newbury.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Newbury — 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 Newbury zoning ordinance · source · 2026-07-07
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Principal (and default) district: everything outside the Business, Blodgett Landing Cottage, and Mt. FRONT setback is 30 ft measured from the EDGE of any adjoining right-of-way (not centerline), with respect to the building footprint or attached structure; side and rear 15 ft…
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Three sections along the Rt. Setbacks: 15 ft from side or rear property line, 30 ft from the EDGE of any adjoining right-of-way, measured to the building footprint or attached structure; Cluster Developments exempt (regulated by ARTICLE 12) (4.6.1).
- Front
- 15 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- —
Historic sewered cottage neighborhood on Lake Sunapee (named streets listed in 6.3). Setbacks TIER BY LOT FRONTAGE (Table 6.7.1); values recorded here are the largest (over-100-ft-frontage) tier as the conservative case.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Covers only the Mt.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Newbury 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 Newbury (Merrimack County). A detached ADU can be up to 950 sf.
In Newbury's R zone, ADUs follow the single-family setbacks: 30 ft front, 15 ft side, and 15 ft rear. Newbury has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.