Build an ADU in Ashland.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Ashland — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
6 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Ashland zoning ordinance · source · 2026-07-07
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 40,000 sf (~0.92 ac)
Principal single-family district covering most of the town's land area; permits single- and two-family dwellings, multifamily up to 6 units/structure, cluster development, mobile homes on individual lots, agriculture (2.2d).
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- 35% building
- Min lot
- 40,000 sf (~0.92 ac)
Village neighborhoods generally served by public water and sewer; permits single- and two-family and multifamily dwellings (2.2c). TIERED MIN LOT: 15,000 sf WITH town water & sewer ('Village Res w-w&s' row); 40,000 sf without ('Village Res w/o', footnote (a): or larger per…
- Front
- 35 ft
- Side
- 15 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
Retail/service/office zone; residential uses INCLUDING APARTMENTS are permitted (2.2a), but ground-floor commercial space on Main Street between Winter and Mill Street may not be converted to residential.
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
Manufacturing, warehousing, trucking, offices, retail (2.2b). Min lot 40,000 sf (footnote a: or per 2.4a Soils and Slopes Table for lots without town sewer). Front 35 (from edge of public ROW per 2.3a), rear 25, side 25.
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 200 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
OVERLAY, not a base zone — its restrictions take precedence over the underlying zone within 500 ft of the Pemigewasset River's high-water line (1,000 ft in floodplain). The 200 recorded as 'rear' is footnote (f): minimum STRUCTURE SETBACK FROM THE PEMIGEWASSET RIVER of 200 ft…
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
OVERLAY over the Rural Residential Zone extending 250 ft inland from the shoreline of Little Squam Lake and Squam River (upstream of the River Street Dam), measured from water's edge at lake level 561 ft The 50 recorded as 'rear' is footnote (d): minimum STRUCTURE SETBACK…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Ashland 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 Ashland (Grafton County). A detached ADU can be up to 950 sf.
In Ashland's RR zone, ADUs follow the single-family setbacks: 35 ft front, 25 ft side, and 25 ft rear. Ashland has 6 zoning districts in total — see the full table below. Confirm your exact zone with the town.