Build an ADU in Bedford.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Bedford — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
10 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Bedford zoning ordinance · source · 2026-07-05
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 65,340 sf (~1.50 ac)
1.5 acres; frontage 150. Side 25 abutting lot / 35 abutting street.
- Front
- 35 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 65,340 sf (~1.50 ac)
Lot tiered by service (0.5/1/1.5 ac); most conservative 65,340.
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- 25% building
- Min lot
- 40,000 sf (~0.92 ac)
40,000 sf +4,000/unit. Side 30 lot / 50 street.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- 25% building
- Min lot
- —
No numeric setbacks printed (dashes).
- Front
- 60 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 75% impervious
- Min lot
- 65,340 sf (~1.50 ac)
1.5 acres; frontage 175. 75% max impervious.
- Front
- 60 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 75% impervious
- Min lot
- 65,340 sf (~1.50 ac)
75% max impervious.
- Front
- 60 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 25% building
- Min lot
- 43,560 sf (~1.00 ac)
1 acre; frontage 150.
- Front
- 60 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 30% building
- Min lot
- 43,560 sf (~1.00 ac)
1 acre; frontage 150.
- Front
- 60 ft
- Side
- 30 ft
- Rear
- 30 ft
- Max coverage
- 25% building
- Min lot
- 43,560 sf (~1.00 ac)
1 acre; frontage 150.
- Front
- 60 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- 25% building
- Min lot
- 130,680 sf (~3.00 ac)
3 acres; frontage 300.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Bedford 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 Bedford (Hillsborough County). A detached ADU can be up to 950 sf.
In Bedford's R&A zone, ADUs follow the single-family setbacks: 35 ft front, 25 ft side, and 25 ft rear. Bedford has 10 zoning districts in total — see the full table below. Confirm your exact zone with the town.