Build an ADU in Francestown.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Francestown — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
2 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Francestown zoning ordinance · source · 2026-07-07
- Front
- 100 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
The town's default district: 'all remaining land within the town' outside the Village corridor (Art 2.3), so the vast majority of Francestown. FRONT SETBACK IS MEASURED FROM THE CENTERLINE OF THE ROAD, not the ROW line (Art 3.10(a) / Table 1: 100 ft from centerline for…
- Front
- 100 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
Corridor district extending 750 ft each side of the centerline of the listed village roads (Rte 47, Rte 136, Second NH Turnpike, Poor Farm Rd, Oak Hill Rd segments; Art 2.2). Dimensional controls are IDENTICAL to the Rural District in Table 1: front 100 ft FROM ROAD…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Francestown 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 Francestown (Hillsborough County). A detached ADU can be up to 950 sf.
In Francestown's Rural zone, ADUs follow the single-family setbacks: 100 ft front, 50 ft side, and 50 ft rear. Francestown has 2 zoning districts in total — see the full table below. Confirm your exact zone with the town.