Build an ADU in Fremont.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Fremont — 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 Fremont zoning ordinance · source · 2026-07-06
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
PRIMARY / dominant zoning district covering most of Fremont; intent is residential development on individual lots plus agriculture, with limited commercial on connector roads by Conditional Use Permit (Art 7 sec 704).
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Residential District (Art 7 sec 707) for single-family and duplex on lots large enough for on-site water and septic; multi-family allowed only by Conditional Use Permit. Same town-wide Article 9 dimensional standards as FUR: front 50 ft from the street property line,…
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Commercial district on high-traffic streets (Art 7 sec 705); corresponds to the 'Commercial Highway District' named in sec 701/702. Fremont sets no separate dimensional table for commercial districts, so the town-wide Article 9 standards apply: front 50 ft from street…
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% impervious
- Min lot
- 87,120 sf (~2.00 ac)
Corporate/commercial/industrial district (Art 7 sec 706) for business parks, R&D, light manufacturing, warehousing and transportation uses; corresponds to the 'Corporate/Commercial District' named in sec 701/702.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Mixed-use traditional Town Center district around Route 107 between Black Rocks Village and the Fremont Library, bordered by Map 3 Lot 22, Map 3 Lot 149, Map 2 Lot 163 and Map 2 Lot 35 (Article 10, secs.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Fremont 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 Fremont (Rockingham County). A detached ADU can be up to 950 sf.
In Fremont's FUR zone, ADUs follow the single-family setbacks: 50 ft front, 30 ft side, and 30 ft rear. Fremont has 5 zoning districts in total — see the full table below. Confirm your exact zone with the town.