Build an ADU in Newport.
New Hampshire's HB 577 lets you add one accessory dwelling unit on your single-family lot in Newport — by-right. A detached ADU can be up to 950 sf, and ADU setbacks match your lot's single-family setbacks.
11 districts
Each district's single-family setbacks — which your ADU follows. The primary residential district is highlighted.
Verified against the official Newport zoning ordinance · source · 2026-07-07
- Front
- 25 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 40,000 sf (~0.92 ac)
Town's principal single-family residential district; permitted use is one-family dwellings (Sec 207.1). Min lot area tiers by utilities (Sec 207.3): 10,000 sf where served by BOTH town sewer and central water (min frontage 75 ft), 20,000 sf where served by EITHER sewer or…
- Front
- 15 ft
- Side
- 8 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 40,000 sf (~0.92 ac)
Permits single-family, two-family and multi-family dwellings plus all R-1 uses (Sec 208.1). Lot size/area follows R-1 Sec 207.3, so the conservative no-water/no-sewer minimum is 40,000 sf (10,000 sf with both utilities, 20,000 sf with one) per Sec 208.3.
- Front
- 50 ft
- Side
- 10 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 40,000 sf (~0.92 ac)
Rural residential/agricultural district permitting single-family dwellings (>=600 sf livable floor space on permanent foundations), farming, forestry (Sec 206.1). Min lot: frontage >=200 ft and land area >=40,000 sf (Sec 206.3); min lot area per dwelling unit 40,000 sf,…
- Front
- 100 ft
- Side
- 50 ft
- Rear
- 50 ft
- Max coverage
- 30% building
- Min lot
- 217,800 sf (~5.00 ac)
Rural/commercial district permitting single-family dwellings, farming, planned commercial/unit development (Sec 206A.1). Min lot: frontage >=300 ft and land area >=5 acres = 217,800 sf (Sec 206A.3). Front yard >=100 ft measured from the edge of the right-of-way (Sec…
- Front
- 50 ft
- Side
- 10 ft
- Rear
- 10 ft
- Max coverage
- 30% building
- Min lot
- 40,000 sf (~0.92 ac)
Village design district permitting single-family dwellings, R-2 uses, and a range of retail/service/commercial uses (Sec 206B.1). Min lot tiers by utilities (Sec 206B.5): 10,000 sf served by BOTH town water and sewer, 20,000 sf served by EITHER, 40,000 sf served by NEITHER -…
- Front
- 25 ft
- Side
- 0 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- —
Light commercial district; new one-family and multi-family dwellings allowed only by special exception (Sec 209.1-209.2). Front yard 25 ft required, except where 50% of block frontage is developed Sec 404 applies, and where a block is split Residential/B-1 the B-1 front yard…
- Front
- 25 ft
- Side
- 0 ft
- Rear
- 25 ft
- Max coverage
- —
- Min lot
- —
Heavy commercial district; new one-family and multi-family dwellings allowed only by special exception (Sec 210.2). Front yard 25 ft required, except a Residential/B-2 split block front yard equals the Residential front yard for that frontage (Sec 210.4.A).
- Front
- —
- Side
- 15 ft
- Rear
- 50 ft
- Max coverage
- 40% building
- Min lot
- 43,560 sf (~1.00 ac)
Industrial district; new one-/two-family dwellings are not a permitted or special-exception use (Sec 211.2-211.3), so this is a non-residential district. Bulk requirements (Sec 211.4): min lot size 1 acre = 43,560 sf; min frontage 100 ft; min side yard 15 ft with combined…
- Front
- 25 ft
- Side
- 15 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 10,000 sf (~0.23 ac)
Professional Business district (overlay-origin district, established 1990) permitting professional/business uses and, by special exception, Accessory Dwelling Units (Sec 213.3). Lot area and dimensions (Sec 213.4): min lot area 10,000 sf; min frontage 75 ft; front yard…
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 30% building
- Min lot
- 43,560 sf (~1.00 ac)
Outdoor recreation district (golf, athletic fields, trails, clubhouses); no dwellings are a permitted or special-exception use (Sec 214.1-214.2), so this is a non-residential district. Dimensional requirements (Sec 214.3): any building or structure must be located at least 25…
- Front
- 25 ft
- Side
- 25 ft
- Rear
- 25 ft
- Max coverage
- 5% building
- Min lot
- —
Conservation district applied to nine specifically enumerated tax-map lots (Sec 215.3). Dimensional requirements (Sec 215.4): any building or structure must be at least 25 ft from any property line, street ROW line, and public/private easement (single 25-ft setback for…
Form-based and downtown districts may use build-to lines instead of fixed setbacks (shown as “—”); verify your parcel's district before you build.
Newport 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 Newport (Sullivan County). A detached ADU can be up to 950 sf.
In Newport's R-1 zone, ADUs follow the single-family setbacks: 25 ft front, 10 ft side, and 25 ft rear. Newport has 11 zoning districts in total — see the full table below. Confirm your exact zone with the town.