Build an ADU in Greenland.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Greenland — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
8 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Greenland zoning ordinance · source · 2026-07-06
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 20% building
- Min lot
- 60,000 sf (~1.38 ac)
Table 4.2 labels coverage 'Lot coverage maximum (footprint)' = building footprint; 80% open space required. Min lot 60,000 sf requires 45,000 sf contiguous non-wetland soil. New duplexes need 90,000 sf (60,000 contiguous non-wetland soil), or 60,000 sf/45,000 contiguous for…
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 50% building
- Min lot
- 60,000 sf (~1.38 ac)
Table 4.2 groups CA, CB, CC in one column: lot 60,000 sf (45,000 contiguous non-wetland soil), 30 ft front / 20 ft rear / 20 ft side, 50% max footprint coverage, 50% open space.
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 50% building
- Min lot
- 60,000 sf (~1.38 ac)
Shares the CA/CB/CC dimensional column: lot 60,000 sf (45,000 contiguous non-wetland soil), 30/20/20 setbacks, 50% max footprint coverage, 50% open space.
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 50% building
- Min lot
- 60,000 sf (~1.38 ac)
Shares the CA/CB/CC dimensional column: lot 60,000 sf (45,000 contiguous non-wetland soil), 30/20/20 setbacks, 50% max footprint coverage, 50% open space.
- Front
- 30 ft
- Side
- 20 ft
- Rear
- 20 ft
- Max coverage
- 50% building
- Min lot
- 60,000 sf (~1.38 ac)
Lot 60,000 sf requiring 45,000 sf contiguous non-wetland soil; 30 ft front / 20 ft rear / 20 ft side; 50% max footprint coverage; 50% open space. No commercial/industrial appurtenances (parking, sewerage) allowed within the Residential District (note 3).
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay district (Sec 3.4.4); has no independent dimensional row in Table 4.2.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay district (Sec 3.4.5); no independent dimensional row in Table 4.2. Dimensional standards of the underlying base district apply; groundwater-protection use restrictions govern.
- Front
- —
- Side
- —
- Rear
- —
- Max coverage
- —
- Min lot
- —
Overlay district (Sec 3.4.6, Article XXVIII) requiring a Conditional Use Permit.
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Greenland 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 Greenland (Rockingham County). A detached ADU can be up to 950 sf.
In Greenland's R zone, ADUs follow the single-family setbacks: 30 ft front, 20 ft side, and 20 ft rear. Greenland has 8 zoning districts in total — see the full table below. Confirm your exact zone with the town.