Build an ADU in Hanover.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Hanover — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
18 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Hanover zoning ordinance · source · 2026-07-05
- Front
- 50 ft
- Side
- 30 ft
- Rear
- 75 ft
- Max coverage
- 25% building
- Min lot
- 100,000 sf (~2.30 ac)
Class 3. Footprint 25%; lot coverage 50% separate.
- Front
- 35 ft
- Side
- 20 ft
- Rear
- 40 ft
- Max coverage
- 25% building
- Min lot
- 20,000 sf (~0.46 ac)
Class 2 conservative. Footprint 25%.
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 20 ft
- Max coverage
- 25% building
- Min lot
- 10,000 sf (~0.23 ac)
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 30 ft
- Max coverage
- 25% building
- Min lot
- 15,000 sf (~0.34 ac)
Class 2 conservative. Footprint 25% (≤30,000 sf).
- Front
- 20 ft
- Side
- 10 ft
- Rear
- 20 ft
- Max coverage
- 25% building
- Min lot
- 10,000 sf (~0.23 ac)
- Front
- 20 ft
- Side
- 10 ft
- Rear
- 20 ft
- Max coverage
- 25% building
- Min lot
- 21,780 sf (~0.50 ac)
- Front
- 25 ft
- Side
- 15 ft
- Rear
- 20 ft
- Max coverage
- 25% building
- Min lot
- 5,000 sf (~0.11 ac)
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 435,600 sf (~10.00 ac)
Major subdivision 10 ac conservative (minor 3 ac).
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 43,560 sf (~1.00 ac)
1 acre; frontage 200. Side/rear 50 only adjoining residential.
- Front
- —
- Side
- 15 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- —
Front set by Downtown Setback Line map. Side/rear only adjoining GR/SR/RR.
- Front
- 10 ft
- Side
- 15 ft
- Rear
- 20 ft
- Max coverage
- —
- Min lot
- 40,000 sf (~0.92 ac)
Side/rear only adjoining residential.
- Front
- 30 ft
- Side
- 15 ft
- Rear
- 20 ft
- Max coverage
- 35% building
- Min lot
- 10,000 sf (~0.23 ac)
Footprint 35%; lot coverage 65% separate.
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 30 ft
- Max coverage
- —
- Min lot
- 60,000 sf (~1.38 ac)
Class 2 most conservative (Class 1 = 43,560).
- Front
- 20 ft
- Side
- 75 ft
- Rear
- 75 ft
- Max coverage
- —
- Min lot
- 60,000 sf (~1.38 ac)
Side/rear 75 only adjoining residential.
- Front
- 100 ft
- Side
- 100 ft
- Rear
- 100 ft
- Max coverage
- —
- Min lot
- 2,178,000 sf (~50.00 ac)
50 acres; frontage 400.
- Front
- 50 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
2 acres; frontage 300.
- Front
- 30 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- 8% lot
- Min lot
- 21,570 sf (~0.50 ac)
No-water-frontage type conservative (front 30). Lot coverage 8%.
- Front
- 10 ft
- Side
- 5 ft
- Rear
- 10 ft
- Max coverage
- —
- Min lot
- 10,000 sf (~0.23 ac)
Build-to. Rear 10 adjacent residential / 0 adjacent I (conservative).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Hanover 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 Hanover (Grafton County). A detached ADU can be up to 950 sf.
In Hanover's SR-1 zone, ADUs follow the single-family setbacks: 50 ft front, 30 ft side, and 75 ft rear. Hanover has 18 zoning districts in total — see the full table below. Confirm your exact zone with the town.