Build an ADU in Middleton.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Middleton — 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 Middleton zoning ordinance · source · 2026-07-07
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Principal single-family district (single-family and two-family houses permitted, Art 5A.A.1). Setbacks are use-based and town-wide: structures (excluding steps and terraces) must be >=50 ft from ANY property line abutting a public or private road (measured from the…
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Residential district around Sunrise Lake; only single-family houses (plus essential services) are permitted — no two-family (Art 5A.B.1). Same town-wide standards: 50 ft from any property line abutting a public/private road, 20 ft from all other lines (Art 5A.B.3); new-lot…
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Mixed district: single-family and two-family houses permitted by right alongside listed commercial uses; light industrial by special exception (Art 5A.C). Values shown are the RESIDENTIAL-use lot standards (Art 6.A), which apply to dwellings here: 5 acres, 200 ft frontage, 50…
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Village-center mixed-use district: single-family, two-family, mixed uses up to two dwelling units per lot/structure, and (added March 2026, citing RSA 674:77-78) multi-family dwellings, plus listed retail/office/civic uses (Art 5A.D.1-2).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Middleton 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 Middleton (Strafford County). A detached ADU can be up to 950 sf.
In Middleton's RR zone, ADUs follow the single-family setbacks: 50 ft front, 20 ft side, and 20 ft rear. Middleton has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.