Build an ADU in Dublin.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Dublin — 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 Dublin zoning ordinance · source · 2026-07-07
- Front
- 35 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 174,240 sf (~4.00 ac)
Principal residential district: the Rural District comprises 'all other areas of the Town not mentioned or described' (Art III.B.4) and Art VIII/X commentary states it 'is intended to be primarily single family residential' (Single Unit Dwelling = P in the Art X use table).
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 35,000 sf (~0.80 ac)
Compact in-fill district around Main Street/the town village. Minimum lot 35,000 sf (Art V.B.1); frontage >=150 ft and depth >=200 ft (Art V.B.2). Setbacks: front 35 ft, side 15 ft, rear 15 ft (Art V.B.3); front measured from the EDGE OF THE RIGHT-OF-WAY.
- Front
- 35 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 348,480 sf (~8.00 ac)
Very-low-density district encircling Mount Monadnock (Art VII), formed to protect the mountain's viewscapes. Minimum lot size 8 acres = 348,480 sf (Art VII.C.1); frontage >=250 ft and depth >=200 ft (Art VII.C.2).
- Front
- 35 ft
- Side
- 35 ft
- Rear
- 35 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Small commercial district at the northeast corner of Bond's Corner (Routes 101 and 137). Minimum lot size 2 acres = 87,120 sf (Art VI.B.1); frontage >=150 ft and depth >=200 ft (Art VI.B.2). Single 35 ft setback from all lot boundaries (Art VI.B.3), front measured from the…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Dublin 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 Dublin (Cheshire County). A detached ADU can be up to 950 sf.
In Dublin's Rural zone, ADUs follow the single-family setbacks: 35 ft front, 35 ft side, and 35 ft rear. Dublin has 4 zoning districts in total — see the full table below. Confirm your exact zone with the town.