Build an ADU in Hinsdale.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Hinsdale — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
5 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Hinsdale zoning ordinance · source · 2026-07-07
- Front
- 35 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- 60% building
- Min lot
- 21,780 sf (~0.50 ac)
Town's principal in-town residential district: 'encompasses the more highly developed sections of town... Dimensional row values (Open Space Requirements table, p 45): min lot 1/2 acre = 21,780 sf; min frontage 100 ft; setback from edge of street 35 ft; setback from other…
- Front
- 35 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 10% building
- Min lot
- 43,560 sf (~1.00 ac)
Rural/low-density district; 'the property included within this district will not have sewer available' and it is the town's designated future growth area. Dimensional row values (table p 45): min lot 1 acre = 43,560 sf; min frontage 200 ft; setback from edge of street 35 ft;…
- Front
- 0 ft
- Side
- 0 ft
- Rear
- 0 ft
- Max coverage
- 100% building
- Min lot
- 5,000 sf (~0.11 ac)
Compact commercial/business core; any use permitted in the Residential District is allowed except manufactured housing. Dimensional row values (table p 45): min lot 5,000 sf; min frontage 41 ft; setback from edge of street 0 ft; setback from other lines is stated as 'party…
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 30% building
- Min lot
- 43,560 sf (~1.00 ac)
Auto-oriented commercial district serving the traveling public along the highway network; comprises Zone A and Zone B (both share one dimensional column in the table). Dimensional row values (table p 45): min lot 1 acre = 43,560 sf; min frontage 100 ft; setback from edge of…
- Front
- 35 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 40% building
- Min lot
- 43,560 sf (~1.00 ac)
Compact industrial-community district (allows any use permitted in the Roadside Commercial District plus industrial uses). Dimensional row values (table p 45): min lot 1 acre = 43,560 sf; min frontage 100 ft; setback from edge of street 35 ft; setback from other (side/rear)…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Hinsdale 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 Hinsdale (Cheshire County). A detached ADU can be up to 950 sf.
In Hinsdale's R zone, ADUs follow the single-family setbacks: 35 ft front, 10 ft side, and 10 ft rear. Hinsdale has 5 zoning districts in total — see the full table below. Confirm your exact zone with the town.