Build an ADU in Haverhill.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Haverhill — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
5 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Haverhill zoning ordinance · source · 2026-07-07
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 40 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
PRECINCT ZONING ONLY - applies solely inside the Precinct of Haverhill Corner. Setbacks (6.02.A): front 50 ft measured from the street right-of-way / front lot line (definition 'SETBACK, FRONT', Art IV); side 30 ft (detached accessory buildings to 15 ft by special exception);…
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 40 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
The Haverhill Corner Historical District (National Register 8-27-1987), excluding the Common District and any floodplain (5.01). Same dimensional standards as District 2: front 50 / side 30 / rear 40 (6.02.A), 1 acre + 150 ft frontage on state/town roads, 3 acres otherwise…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
All land in the Precinct identified as Flood Hazard Areas in the FEMA Flood Insurance Study/FIRMs for Haverhill (5.03). NO DWELLINGS: permitted uses are only those that do not result in the erection of any dwelling or commercial structure or alter the ground surface by fill…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
The 'Commons' - land bordered by Route 10, School Street and Park Street, bisected by Court Street (5.04).
- Front
- 65 ft
- Side
- 12 ft
- Rear
- 12 ft
- Max coverage
- —
- Min lot
- —
PRECINCT ZONING ONLY - the entire Mountain Lakes village district is one zoning district (Sec 301). Dimensions (Table 302.1): FRONT 65 ft - MEASURED FROM THE CENTERLINE of the existing traveled way of the street (306.2.C), not the lot line; a lot bordering two streets has two…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Haverhill 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 Haverhill (Grafton County). A detached ADU can be up to 950 sf.
In Haverhill's HC-2 zone, ADUs follow the single-family setbacks: 50 ft front, 30 ft side, and 40 ft rear. Haverhill has 5 zoning districts in total — see the full table below. Confirm your exact zone with the town.