Build an ADU in South Hampton.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in South Hampton — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
8 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official South Hampton zoning ordinance · source · 2026-07-07
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
The town's principal (and effectively only mapped base) residential district: one single-family dwelling per lot, incl manufactured housing (IV.1.2); apartments/condos/multifamily prohibited (IV.3). Dimensions per Article III (referenced by IV.2): front setback 40 ft from the…
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Defined geographically as all land within 1,000 ft of the centerline of Route 150 on both sides (Art V preamble). Permits any Rural Residential use plus wholesale/retail business, mobile home parks, golf courses, commercial greenhouses, stables, telecom towers (max 180 ft,…
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Article VI contains NO mapped industrial land and no district-specific dimensional standards: it is a procedural article directing the Planning Board to consider rezoning requests for industrial use and put recommendations to the voters.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
OVERLAY covering all wetlands in town (mapped photo is a guide only; actual soils govern) — where superimposed, the more restrictive regulation applies (VII.4.1). Structures generally prohibited on wetlands; erection of structures/dredge/fill allowed only for listed…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- 10% impervious
- Min lot
- 130,680 sf (~3.00 ac)
OVERLAY (aquifer protection; amended 3/11/25). Min lot size within the district is 3 acres (130,680 sf) per dwelling unit for residential use or per principal building for non-residential (VIII.4.1). Max site coverage: no more than 10% of a lot may be rendered impervious for…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
OVERLAY on areas with slopes exceeding 8% (Art IX, adopted 3/12/86). All uses otherwise allowed by the ordinance are allowed, but when 25% OR MORE of a property falls within the steep slope district, lot dimensions must be at least 3 acres (130,680 sf) with 250 ft frontage…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
OVERLAY (rewritten 2/1/99) superimposed on underlying districts in four areas (Hilltop, Highland Road Area, Jewell Town, Currierville; boundaries described by tax-map parcels in X.1.2).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
OVERLAY: standard NFIP flood plain development ordinance (RSA 674:26) applying to FEMA Special Flood Hazard Areas per the Rockingham County Flood Insurance Study dated 1/29/2021 and listed FIRM panels (amended 2021, 2024).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
South Hampton 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 South Hampton (Rockingham County). A detached ADU can be up to 950 sf.
In South Hampton's RR zone, ADUs follow the single-family setbacks: 40 ft front, 25 ft side, and 25 ft rear. South Hampton has 8 zoning districts in total — see the full table below. Confirm your exact zone with the town.