Build an ADU in Jaffrey.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Jaffrey — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
7 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Jaffrey zoning ordinance · source · 2026-07-07
- Front
- 30 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
Town's principal residential district. TIERED lot/setbacks by utilities (Sec VI 6.1 table): the CONSERVATIVE base tier (no town water/sewer) recorded here is 43,560 sf (1 ac), frontage 125 ft, front/side/rear 30/30/30.
- Front
- 30 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
Village-center residential district (includes the Jaffrey Center Historic District overlay). More restrictive uses than RD: detached single-family dwellings only among residential uses (Sec 4.2.1); no duplex/multi-family except via Open Space Development Plan.
- Front
- 60 ft
- Side
- 40 ft
- Rear
- 40 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Large-lot rural district; permits detached single-family dwellings, farms, and (only within an Open Space Development Plan) duplex/multi-family up to 4 units/building (Sec 4.1). TIERED by town water (Sec VI 6.1 table): the CONSERVATIVE 'Rural WOTW' (WithOut Town Water) tier…
- Front
- 60 ft
- Side
- 40 ft
- Rear
- 40 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Conservation-oriented overlay on the slopes of Mount Monadnock (adopted 1992; Sec 4.8). Single dimensional standard (Sec VI 6.1 table, no utility tier): 130,680 sf (3 ac), frontage 200 ft, front 60, side 40, rear 40.
- Front
- —
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- —
Downtown mixed-use core (General Business 'A' and the Main Street Program Area were consolidated into this district in 2026). Sec VI 6.1 table gives NO minimum lot size or frontage (N/A).
- Front
- 100 ft
- Side
- 30 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 108,900 sf (~2.50 ac)
General industrial district (manufacturing, warehousing, R&D, etc.; Sec 4.6). Sec VI 6.1 table: 2.5 acres (108,900 sf), frontage 200 ft, front 100, side 30, rear 50. No coverage/impervious cap.
- Front
- 100 ft
- Side
- 30 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 108,900 sf (~2.50 ac)
Turnpike Road (Millipore) industrial district (Sec 4.7; amended 2012). Sec VI 6.1 table, 'including Tract A' row: 2.5 acres (108,900 sf), frontage 200 ft, front 100, side 30, rear 50. Special 'Tract A' sub-standard: where Tract A abuts Rural-zoned property, a 100 ft 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.
Jaffrey 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 Jaffrey (Cheshire County). A detached ADU can be up to 950 sf.
In Jaffrey's RD zone, ADUs follow the single-family setbacks: 30 ft front, 30 ft side, and 30 ft rear. Jaffrey has 7 zoning districts in total — see the full table below. Confirm your exact zone with the town.