Build an ADU in Candia.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Candia — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
7 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Candia zoning ordinance · source · 2026-07-06
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 130,680 sf (~3.00 ac)
PRIMARY single-family residential district - Section 4.03A: 'designed for the protection of areas that have been and are being developed predominantly for single-family detached dwellings.' Section 6.02 dimensional table row R: minimum lot area 3 acres (130,680 sf), minimum…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Commercial District (Section 4.03B) - centralized shopping/office/retail area. In the Section 6.02 dimensional table, C, L1 (LI-1) and L2 (LI-2) share a single combined row 'C/L1/L2': minimum lot area 2 acres (87,120 sf), lot width & frontage 200 ft, front 50 ft, side 25 ft,…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Light Industrial 1 District (short name LI-1 per sec 4.01; described as 'Zone L1 - Light Industrial' in sec 4.03C) - light manufacturing and small-scale light service industries. Shares the combined 'C/L1/L2' row in the Section 6.02 table: minimum lot 2 acres (87,120 sf), lot…
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Light Industrial 2 District (short name LI-2 per sec 4.01; described as 'Zone L2 - Light Industrial' in sec 4.03D) - encourages a variety of light manufacturing/light industry with good transportation access to broaden the tax base.
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- 87,120 sf (~2.00 ac)
Mixed Use District (Section 4.03E) - provides for a greater variety and blending of land uses; residential and commercial uses may combine within a principal structure on a lot. Section 6.02 table row MX: minimum lot area 2 acres (87,120 sf), lot width & frontage 200 ft,…
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay/conservation district listed among the six districts in sec 4.01 but with NO row in the Section 6.02 dimensional table - it overlays the underlying base zone (which supplies the lot/setback numbers) and is governed by Article X: Wetlands Protection.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay district listed in sec 4.01 (short name GPD; also written 'GPP' in sec 4.03G) with NO row in the Section 6.02 dimensional table - governed by Article XI: Groundwater Protection. It overlays the underlying base zone (which supplies dimensional/setback numbers) and…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Candia 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 Candia (Rockingham County). A detached ADU can be up to 950 sf.
In Candia's R zone, ADUs follow the single-family setbacks: 50 ft front, 25 ft side, and 25 ft rear. Candia has 7 zoning districts in total — see the full table below. Confirm your exact zone with the town.