Build an ADU in Marlow.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Marlow — 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 Marlow zoning ordinance · source · 2026-07-07
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Principal single-family residential district; 'residential use in a rural setting, with a higher density than will be found in the rest of the rural area' (Sec 404.1). Section 410 table: min lot area 2 acres (87,120 sf; the '2' in R-2 is the recommended acreage per Sec 401…
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
Mixed-use district: one- and two-family dwellings, local government, professional offices, home occupations, small trades, and retail/service/village uses permitted at higher density (Sec 403.3). Section 410 table: min lot area 1 acre (43,560 sf), min frontage 175 ft, min…
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 217,800 sf (~5.00 ac)
Medium-density rural residential (Sec 405.1). Section 410 table: min lot area 5 acres (217,800 sf), min frontage 200 ft, min setback from right-of-way 40 ft (front), min setback from all other property lines (side and rear) 25 ft, max height 35 ft / 2.5 stories.
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 435,600 sf (~10.00 ac)
Low-density rural living (Sec 406.1). Section 410 table: min lot area 10 acres (435,600 sf), min frontage 300 ft, min setback from right-of-way 40 ft (front), min setback from all other property lines (side and rear) 25 ft, max height 35 ft / 2.5 stories.
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 871,200 sf (~20.00 ac)
Protects the most fragile and remote land (poor/no road access, steep slopes, wetlands, shallow soils) for forestry and limited agriculture (Sec 407.1). Section 410 table: min lot area 20 acres (871,200 sf), min frontage 400 ft, min setback from right-of-way 40 ft (front),…
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- —
- Min lot
- —
Overlay-style commercial zones along NH Route 10 (Sec 408). CONSERVATIVE tier shown is Commercial Zone I: min frontage setback for buildings/structures/parking 50 ft from the edge of the State right-of-way on Route 10 (front, MEASURED FROM ROW, Sec 408.2.2), and min setback…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay district superimposed over base districts on poorly/very-poorly drained soils per the Medium Intensity Soil Survey; where it overlaps another district the MORE RESTRICTIVE regulations apply (Sec 409.1).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Marlow 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 Marlow (Cheshire County). A detached ADU can be up to 950 sf.
In Marlow's R-2 zone, ADUs follow the single-family setbacks: 40 ft front, 25 ft side, and 25 ft rear. Marlow has 7 zoning districts in total — see the full table below. Confirm your exact zone with the town.