Build an ADU in Laconia.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Laconia — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
9 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Laconia zoning ordinance · source · 2026-07-04
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Lot tiered 2 ac / 40,000 / 10,000 — conservative 2 ac. Green 65%.
- Front
- 40 ft
- Side
- 25 ft
- Rear
- 40 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
2 acres all tiers. Green 65%.
- Front
- 75 ft
- Side
- 35 ft
- Rear
- 50 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
2 acres. Green 65%.
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Lot tiered 2 ac / 40,000 / 10,000. Green 65%. Density 6/ac.
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Lot tiered, conservative 2 ac. Green 60%.
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 10,000 sf (~0.23 ac)
Only water&sewer tier populated. Green 60%.
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 15 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Has residential uses. Conservative 2 ac.
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Conservative 2 ac. Green 20%.
- Front
- 5 ft
- Side
- 5 ft
- Rear
- 5 ft
- Max coverage
- —
- Min lot
- 8,000 sf (~0.18 ac)
New construction meets these. Green 10%.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Laconia 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 Laconia (Belknap County). A detached ADU can be up to 950 sf.
In Laconia's RS zone, ADUs follow the single-family setbacks: 25 ft front, 10 ft side, and 15 ft rear. Laconia has 9 zoning districts in total — see the full table below. Confirm your exact zone with the town.