Build an ADU in Newington.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Newington — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
10 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Newington zoning ordinance · source · 2026-07-06
- Front
- 40 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 80,000 sf (~1.84 ac)
R Zone (Residential District, Article III Sec 1) single-family.
- Front
- 40 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 120,000 sf (~2.75 ac)
Two-family within the R Zone.
- Front
- 75 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- —
- Min lot
- 120,000 sf (~2.75 ac)
Office District (Article III Sec 2).
- Front
- 75 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% building
- Min lot
- 120,000 sf (~2.75 ac)
Commercial District (Article III Sec 3).
- Front
- 75 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% building
- Min lot
- 120,000 sf (~2.75 ac)
Marina District (Article III Sec 4).
- Front
- 75 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 200,000 sf (~4.59 ac)
Industrial District (Article III Sec 5).
- Front
- 75 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 200,000 sf (~4.59 ac)
W Zone (Waterfront Industry & Commerce District, Article III Sec 6); listed as 'Waterfront Industrial' in Table VII-1.
- Front
- 70 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 80,000 sf (~1.84 ac)
'Airport Industrial' dimensional row in Table VII-1 (associated with the Pease Tradeport / airport area).
- Front
- 40 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
'Light Industrial' dimensional row in Table VII-1.
- Front
- 30 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 12,000 sf (~0.28 ac)
'Mobile Home' dimensional row in Table VII-1 (manufactured housing on a lot in a residential district per Article IV Sec 5).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Newington 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 Newington (Rockingham County). A detached ADU can be up to 950 sf.
In Newington's R-1 zone, ADUs follow the single-family setbacks: 40 ft front, 15 ft side, and 15 ft rear. Newington has 10 zoning districts in total — see the full table below. Confirm your exact zone with the town.