Build an ADU in Epping.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Epping — 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 Epping zoning ordinance · source · 2026-07-06
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 20 ft
- Max coverage
- 30% building
- Min lot
- 60,000 sf (~1.38 ac)
Primary medium-density developed residential district; single-family detached dwellings permitted (incl pre-site built and manufactured housing). Green Space min 30% (added 3/10/20).
- Front
- 100 ft
- Side
- 25 ft
- Rear
- 50 ft
- Max coverage
- 35% building
- Min lot
- 87,120 sf (~2.00 ac)
Front setback is 100 ft from centerline of all existing roads and 75 ft from centerline of proposed (non-existing) internal roads of Class V or greater. Green Space min 30% (added 3/10/20). Max building height 35 ft Min frontage 200 ft.
- Front
- 100 ft
- Side
- 25 ft
- Rear
- 50 ft
- Max coverage
- 35% building
- Min lot
- 87,120 sf (~2.00 ac)
Front setback is 100 ft from centerline of all existing roads and 75 ft from centerline of proposed (non-existing) internal roads of Class V or greater. Green Space min 30% (added 3/10/20).
- Front
- 50 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 50% building
- Min lot
- 40,000 sf (~0.92 ac)
Green Space min 30% (added 3/10/20). Max building height 35 ft Min frontage 200 ft Lot dimensions, setbacks and uses also subject to the Aquifer/Groundwater Protection Ordinance where applicable (more stringent controls).
- Front
- 15 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- 70% building
- Min lot
- 20,000 sf (~0.46 ac)
Min lot size is 20,000 sf per dwelling unit. Front setback is 15 ft, but any property with frontage on or abutting Route 125 (Calef Hwy) must have a minimum 100 ft setback from the centerline of Route 125.
- Front
- 25 ft
- Side
- 15 ft
- Rear
- 25 ft
- Max coverage
- 40% building
- Min lot
- 20,000 sf (~0.46 ac)
Front setback is 25 ft, but any property with frontage on or abutting Route 125 (Calef Hwy) must have a minimum 100 ft setback from the centerline of Route 125. Green Space min 30% (added 3/10/20). Max building height 35 ft Min frontage 100 ft Serves largely-developed…
- Front
- 30 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 25% building
- Min lot
- 88,000 sf (~2.02 ac)
Lowest-density residential district; single-family detached and customary farm uses. Green Space min 30% (added 3/10/20). Max building height 35 ft Min frontage 200 ft ADUs ('In-Law' apartments) allowed as accessory use per Article 6.13.
- Front
- 100 ft
- Side
- 25 ft
- Rear
- 35 ft
- Max coverage
- 30% building
- Min lot
- 130,680 sf (~3.00 ac)
Min lot area 3 acres (130,680 sf). Front yard 100 ft from centerline of all existing roads and 75 ft from centerline of proposed non-existing internal roads of Class V or greater (75 ft existing / 50 ft proposed internal per Schedule I detail).
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Epping 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 Epping (Rockingham County). A detached ADU can be up to 950 sf.
In Epping's R zone, ADUs follow the single-family setbacks: 25 ft front, 25 ft side, and 20 ft rear. Epping has 8 zoning districts in total — see the full table below. Confirm your exact zone with the town.