Build an ADU in Hooksett.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Hooksett — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
11 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Hooksett zoning ordinance · source · 2026-07-06
- Front
- 35 ft
- Side
- 20 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
PRIMARY conventional single-family district (Article 4, adopted 03/12/2024). Purpose: conventional single-family neighborhoods on lots not less than 2 acres (87,120 sf); may be served by municipal sewer/water or on-site septic/wells; agriculture/farming promoted.
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 32,670 sf (~0.75 ac)
Article 5 (adopted 03/12/2024). MINIMUM LOT AREA IS UTILITY-TIERED for a single-family dwelling: 32,670 sf w/ BOTH municipal water and sewer (frontage 150 ft) - value recorded; 43,560 sf w/ EITHER water or sewer (frontage 175 ft); 65,340 sf w/ NEITHER (frontage 200 ft) (D.1).
- Front
- 25 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 9,000 sf (~0.21 ac)
Article 5-A (adopted 05/08/07; purpose text adopted 03/12/2024). Conventional single-family neighborhoods, some historic homes, built close to sidewalks/intersections; ALL served by municipal sewer and water.
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 30,000 sf (~0.69 ac)
Article 6 (adopted 03/12/2024). Higher-density multi-family district near Routes 3, 3A, 28; all lots served by municipal water and sewer. Minimum lot area 30,000 sf; density <=12 units/acre; minimum frontage 200 ft (D).
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 22,500 sf (~0.52 ac)
Article 10 (adopted 03/12/2024). MINIMUM LOT AREA IS UTILITY-TIERED (per use): 22,500 sf when served by municipal water OR sewer, frontage 150 ft (value recorded); 44,000 sf when served by NEITHER, frontage 200 ft (F).
- Front
- 30 ft
- Side
- —
- Rear
- —
- Max coverage
- 50% impervious
- Min lot
- 43,560 sf (~1.00 ac)
Article 10-A (adopted 05/08/06). Standards come from 'Figure 10-A (1) Table of Performance Dimensional Standards' and are FORM/UTILITY-TIERED rather than fixed feet. MIN LOT AREA & MAX IMPERVIOUS COVER are utility-tiered: WITH public water+sewer = 1.0 acre (43,560 sf,…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Article 11 (adopted 03/12/2024). Minimum lot area 87,120 sf (2 acres) per lot use, minimum frontage 200 ft (C.3). SETBACKS (C.4): building >= 50 ft from any public right-of-way (front); >= 25 ft from each side and rear line abutting NON-residential districts (recorded), but…
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 44,000 sf (~1.01 ac)
Article 12 (amended 3/11/2025). Minimum lot area 44,000 sf per use, minimum frontage 200 ft (C).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Article 13 (adopted 5/9/00). A master-plan / form-based district, NOT a fixed-dimension district: development proceeds under an approved 'MUD 2 Master Plan' mixing industrial/commercial (25-50% of net usable acreage), residential (50-75%), and public use (<=10%), with >=30%…
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Article 15 (amended 3/11/2025). Minimum lot area 87,120 sf (2 acres) per use, minimum frontage 200 ft (C).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Article 16. A master-plan / form-based district like MUD2, NOT a fixed-dimension district: development follows an approved 'MUD 5 Master Plan' mixing industrial/commercial, residential (four density types), and public use, with >=30% open space.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Hooksett 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 Hooksett (Merrimack County). A detached ADU can be up to 950 sf.
In Hooksett's LDR zone, ADUs follow the single-family setbacks: 35 ft front, 20 ft side, and 25 ft rear. Hooksett has 11 zoning districts in total — see the full table below. Confirm your exact zone with the town.