Build an ADU in Kensington.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Kensington — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
2 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Kensington zoning ordinance · source · 2026-07-07
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
The town's principal (and default) single-family district — one single-family dwelling per lot of record (3.2.2.A.1); all parcels not listed in the CI district are RA. FRONT is measured from the right-of-way: 'minimum depth of 25 feet between the nearest right-of-way and any…
- Front
- 100 ft
- Side
- 60 ft
- Rear
- 60 ft
- Max coverage
- 60% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Small parcel-defined district along Route 150 (Amesbury Rd), listed by tax map/lot in 3.1.2.B. Coverage 60% of lot area — basis is 'structure and parking lots' combined (3.1.5.B.6), narrower than a true all-impervious cap (walkways/patios not enumerated) but broader than…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Kensington 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 Kensington (Rockingham County). A detached ADU can be up to 950 sf.
In Kensington's RA zone, ADUs follow the single-family setbacks: 25 ft front, 25 ft side, and 25 ft rear. Kensington has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.