Build an ADU in Lee.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Lee — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
3 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Lee zoning ordinance · source · 2026-07-05
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 85,000 sf (~1.95 ac)
85,000 sf developable; frontage 200. Special-exception setbacks 50/35/35. Duplex needs >5 ac.
- Front
- 125 ft
- Side
- 100 ft
- Rear
- 100 ft
- Max coverage
- 25% impervious
- Min lot
- 85,000 sf (~1.95 ac)
Front 125 from highway ROW. Side/rear 50 from property line, 100 abutting residential (conservative). No residential use.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Single parcel; standards article not captured.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Lee 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 Lee (Strafford County). A detached ADU can be up to 950 sf.
In Lee's A zone, ADUs follow the single-family setbacks: 50 ft front, 25 ft side, and 25 ft rear. Lee has 3 zoning districts in total — see the full table below. Confirm your exact zone with the town.