Build an ADU in Rollinsford.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Rollinsford — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
8 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Rollinsford zoning ordinance · source · 2026-07-06
- Front
- 20 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 30% building
- Min lot
- 30,000 sf (~0.69 ac)
Primary high-density residential district (municipal sewer+water). Min lot 30,000 sf ONLY where served by municipal sewer AND water; if not so served, min lot size is 1 acre (43,560 sf) per footnote 5.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- 30% building
- Min lot
- 15,000 sf (~0.34 ac)
Historic village district; form/context-based. Min lot width 100 ft Stories and max height carry an undefined footnote (14) — no numeric standard stated; governed by 'build-to' lines and existing-building height per the district purpose (3.2.7).
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 30 ft
- Max coverage
- 25% building
- Min lot
- 130,680 sf (~3.00 ac)
Medium-density residential; min lot 3 acres (130,680 sf), min lot width 200 ft, max 2.5 stories / 35 ft Split into SR1/SR2 in the Table of Uses (6.9) but share this single dimensional row. Multi-family: min lot 90,000 sf + 300 ft frontage plus 10,000 sf/unit of buildable land.
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 20% building
- Min lot
- 174,240 sf (~4.00 ac)
Rural/low-density; min lot 4 acres (174,240 sf), min lot width 200 ft, max 2.5 stories / 35 ft Front setback subject to footnote 8 (250 ft from Salmon Falls River where applicable).
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 25% building
- Min lot
- 87,120 sf (~2.00 ac)
Combined Industrial and Mill row. Min lot 2 acres (87,120 sf), min lot width 200 ft, max 40 ft (no story cap). Footnote 12: on any lot abutting Jessie Doe Rd, min lot 1 acre & width 100 ft.
- Front
- 15 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 25% building
- Min lot
- 10,000 sf (~0.23 ac)
Min lot 10,000 sf, min lot width 50 ft, max 40 ft (no story cap). Footnote 11 (50% setback for pavement/septic/parking) and footnote 12 (1 acre / 100 ft width if abutting Jessie Doe Rd) apply.
- Front
- 25 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 30% building
- Min lot
- 20,000 sf (~0.46 ac)
Min lot 20,000 sf, min lot width 100 ft, max 40 ft (no story cap). Footnote 11 (50% setback for pavement/septic/parking) and footnote 12 (1 acre / 100 ft width if abutting Jessie Doe Rd) apply.
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- 20% building
- Min lot
- 435,600 sf (~10.00 ac)
Min lot 10 acres (435,600 sf), min lot width 200 ft, max 2.5 stories / 35 ft Footnote 9: wetlands, steep slopes, utility easements and rights-of-way are excluded from the min-lot-size calculation.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Rollinsford 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 Rollinsford (Strafford County). A detached ADU can be up to 950 sf.
In Rollinsford's UR zone, ADUs follow the single-family setbacks: 20 ft front, 15 ft side, and 15 ft rear. Rollinsford has 8 zoning districts in total — see the full table below. Confirm your exact zone with the town.