Build an ADU in Kingston.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Kingston — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
9 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Kingston zoning ordinance · source · 2026-07-06
- Front
- 20 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- —
PRIMARY single-family residential district (Article 103, amended through 03/11/2025). The article sets NO numeric minimum lot area and NO maximum lot coverage %; residential lot size in Kingston is driven by state septic/soil sizing rather than an ordinance minimum, so those…
- Front
- 20 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- —
Article 105 (adopted 3/13/1979; amended through 03/11/2025). No numeric minimum lot area and no lot-coverage % stated in the article (soil/septic-governed).
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- —
Article 104 (amended through 03/11/2025). Setbacks (104.5.E): new buildings 30 ft front from nearest existing or proposed public right-of-way; 20 ft from side and rear lot lines; where commercial use abuts residential use a 50 ft vegetated buffer (>=50% evergreen) is required.
- Front
- 50 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 435,600 sf (~10.00 ac)
Article 106 (adopted 11/4/1980; amended through 03/11/2025); also called Housing for Elderly District. Minimum lot area 10 acres (435,600 sf) (106.3.A). Density up to 4 bedrooms per acre of gross tract area excluding wetlands (106.3.B).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Article 102, established under NH RSA Chapter 674 to preserve historical/architectural heritage. Comprises Historic District I (Main Street area, 350 ft from centerline; plus Church Street corridor) and Historic District II (Alma Ave, Little River Rd, etc.).
- Front
- 60 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 70% impervious
- Min lot
- 120,000 sf (~2.75 ac)
Article 107 (adopted 10/27/1987). Per Table 1 (107.3 'Lot Size, Dimensions, Set Backs' and 'Coverage Controls'): minimum lot area 120,000 sf; minimum front-lot width 200 ft; minimum lot depth 200 ft; max height 40 ft / 2.5 stories; minimum FRONT yard 60 ft (applies to both…
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 35% lot
- Min lot
- 87,120 sf (~2.00 ac)
Article 108 (amended through 03/11/2025). Minimum lot size 2 acres (87,120 sf); minimum continuous frontage 200 ft on an approved Class V-or-better road. Setbacks: front 30 ft from nearest existing or proposed public right-of-way; side and rear 20 ft from lot lines; where the…
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 35% lot
- Min lot
- 87,120 sf (~2.00 ac)
Article 109 (amended through 03/11/2025). Dimensional standards mirror Commercial C-I: minimum lot size 2 acres (87,120 sf); minimum continuous frontage 200 ft on a Class V-or-better road; front setback 30 ft from nearest existing or proposed public right-of-way; side and…
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 75% lot
- Min lot
- —
Article 110 (amended through 03/11/2025). Lot Regulations (110.6): max building height 40 ft occupied space; base structure setbacks Front 30 ft / Side 20 ft / Rear 20 ft; SPECIAL setbacks that override when larger — 100 ft from the centerline of NH Route 125 (any side), and…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Kingston 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 Kingston (Rockingham County). A detached ADU can be up to 950 sf.
In Kingston's SFR zone, ADUs follow the single-family setbacks: 20 ft front, 20 ft side, and 20 ft rear. Kingston has 9 zoning districts in total — see the full table below. Confirm your exact zone with the town.