Build an ADU in Claremont.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Claremont — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
15 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Claremont zoning ordinance · source · 2026-07-07
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 10,000 sf (~0.23 ac)
Principal single-family residential district (single-family dwellings are the primary permitted use, sec 22-206(1)). Yards (sec 22-210): setback 25 ft from any public or private right-of-way; front 25, each of two side yards 10, rear 25; separate buildings on a lot >=10 ft apart.
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 5,000 sf (~0.11 ac)
Denser residential district. Yards (sec 22-230): setback 25 ft from any public right-of-way; front 25, each of two side yards 10, rear 25; buildings on a lot >=10 ft apart.
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 50 ft
- Max coverage
- 10% building
- Min lot
- 217,800 sf (~5.00 ac)
Large-lot rural/agricultural district. Min lot 5 acres (217,800 sf), min width 250 ft (sec 22-149). Yards (sec 22-150): setback 50 ft from any public or private ROW; front 50, each of two side yards 25, rear 50; buildings >=10 ft apart.
- Front
- 50 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 43,560 sf (~1.00 ac)
Min lot 1 acre (43,560 sf), min width 150 ft (sec 22-169). Yards (sec 22-170): setback 50 ft from any public or private ROW; front 50, each of two side yards 10, rear 25; buildings >=10 ft apart. Density 1 du/acre (sec 22-172).
- Front
- 50 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 43,560 sf (~1.00 ac)
Min lot 1 acre (43,560 sf), min width 150 ft (sec 22-189). Yards (sec 22-190): setback 50 ft from any public or private ROW; front 50, each of two side yards 10, rear 25; buildings >=10 ft apart. Density 1 du/acre (sec 22-192).
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 10,000 sf (~0.23 ac)
City Center residential district; standards from the Table of Dimensional Regulations (sec 22-389).
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 5,000 sf (~0.11 ac)
City Center residential district; Table of Dimensional Regulations (sec 22-389).
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 5,000 sf (~0.11 ac)
City Center professional-residential district; Table of Dimensional Regulations (sec 22-389).
- Front
- 0 ft
- Side
- 0 ft
- Rear
- 15 ft
- Max coverage
- 90% building
- Min lot
- 5,000 sf (~0.11 ac)
City Center mixed-use (downtown) district; Table of Dimensional Regulations (sec 22-389). Min lot 5,000 sf, min width 60 ft Front yard setback is 0 ft minimum with a 15 ft MAXIMUM build-to (sec 22-389.5); side yard 0; rear 15; coverage 90% (building basis); max height 50 ft…
- Front
- 0 ft
- Side
- 15 ft
- Rear
- 25 ft
- Max coverage
- 60% building
- Min lot
- 20,000 sf (~0.46 ac)
City Center business district; Table of Dimensional Regulations (sec 22-389). Min lot 20,000 sf, min width 100 ft Front setback 0 ft minimum with a 25 ft MAXIMUM build-to (sec 22-389.6); two side yards of 15 each; rear 25; building separation 25; coverage 60% (building…
- Front
- 50 ft
- Side
- 15 ft
- Rear
- 25 ft
- Max coverage
- 60% building
- Min lot
- 20,000 sf (~0.46 ac)
General (non-City-Center) business district. Yards (sec 22-300): setback 50 ft from any public ROW; front 50; two side yards of 15 each (no side yard required where the main building shares a fireproof party wall acceptable to the fire chief); rear 25 with fire-equipment…
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 40 ft
- Max coverage
- 60% impervious
- Min lot
- 40,000 sf (~0.92 ac)
Min lot 40,000 sf, min width 200 ft (sec 22-319). Yards (sec 22-320): setback 50 ft from any public ROW; front 50; two side yards of 30 each; rear 40; building separation 25 ft Coverage 60% counting 'all buildings, including accessory buildings AND impermeable surfaces' (sec…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 60% impervious
- Min lot
- 80,000 sf (~1.84 ac)
Min lot 80,000 sf, min width 200 ft (sec 22-338). Yards (sec 22-339): setback 50 ft from any public ROW; front 50; two side yards of 25 each; rear 25 with fire-equipment access; building separation 25 ft Coverage 60% counting buildings incl accessory AND impermeable surfaces…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 60% impervious
- Min lot
- 80,000 sf (~1.84 ac)
Min lot 80,000 sf, min width 200 ft (sec 22-354.3). Yards (sec 22-354.4): setback 50 ft from any public ROW; front 50; two side yards of 25 each; rear 25; building separation 25 ft Coverage 60% counting buildings incl accessory AND impermeable surfaces (sec 22-354.5) =…
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 80% building
- Min lot
- —
Hospital-area overlay/base district (sec 22-376). The ordinance states NO fixed minimum lot area for the district (minLotSqft null); instead a planned unit development of 2+ acres may be approved by the planning board with its own density cap of 4,000 sf of floor area per…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Claremont 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 Claremont (Sullivan County). A detached ADU can be up to 950 sf.
In Claremont's R-1 zone, ADUs follow the single-family setbacks: 25 ft front, 10 ft side, and 25 ft rear. Claremont has 15 zoning districts in total — see the full table below. Confirm your exact zone with the town.