ADUs in Portsmouth
Downtown Portsmouth is a tight lot, usually on city utilities. The Bean is 384 sq ft. The Wakefield is 525 sq ft on one floor. The Summit is 654 sq ft. We'll read your lot before a larger plan.
Price a Portsmouth ADURockingham County · New Hampshire
ADUs and site work in Portsmouth, NH
Portsmouth sits on the Piscataqua River at the Maine line. Langone Site Services builds turn-key ADUs there and handles excavation, site work, and septic. Call (978) 987-0089 and we will confirm the scope for your lot. We don't publish a New Hampshire septic starting price.
- County
- Rockingham CountyCounty
- ZIP code
- 03801ZIP code
- Plans shortlisted here
- 3Plans shortlisted here
- Verified district setbacks
- On requestVerified district setbacks
Local rules
What Portsmouth actually allows.
Portsmouth follows HB 577. Downtown lots are tight and usually on city utilities. If the lot sits in a historic area, we'll read those rules with the parcel.
The lot in Portsmouth.
Portsmouth is a Seacoast city in Rockingham County, on the Piscataqua River at the Maine line. Tight lots are common. Rules change by block, so we'll read your lot.
Setbacks
Setbacks in Portsmouth.
A tight downtown Portsmouth lot and a parcel farther out do not share one setback. We'll read the zone before we talk footprint.
Plans that fit
All 10 modelsWhere we would start in Portsmouth.
The Bean, The Wakefield, and The Summit. All three stay under 700 sq ft, which is the practical start on a downtown lot.
The Bean
$147,000starting
- sq ft
- 384
- bed
- 1
- bath
- 1
384 sq ft, 1 bed / 1 bath, 16×24, one story.
View this modelThe Wakefield
$216,000starting
- sq ft
- 525
- bed
- 1
- bath
- 1
525 sq ft, 1 bed / 1 bath, 30×18, one story.
View this modelThe Summit
$235,000starting
- sq ft
- 654
- bed
- 1
- bath
- 1
654 sq ft, 1 bed / 1 bath, 30×22, one story.
View this modelOn the ground
The dirt work behind a Portsmouth build.
Excavation in Portsmouth
Portsmouth excavation is tight downtown access and utility cuts along the Piscataqua.
ExcavationSeptic in Portsmouth
We'll check whether a Portsmouth lot is on town sewer or needs a septic design, then price the system from the site.
Septic installationSite work in Portsmouth
Portsmouth site work is utility cuts on tight downtown streets. Call (978) 987-0089 and we will look at the street and the utilities.
Site workNearby
Beyond Portsmouth.
Every town we cover is listed on the service area page.
Start here
Send us the address in Portsmouth.
We will read the ordinance against your parcel, look at what the ground will take for septic and access, and come back to you with a figure rather than a range.
FAQ
Straight answers.
- Who builds ADUs in Portsmouth, NH?
- Langone Site Services builds turn-key ADUs in Portsmouth. Downtown lots are usually tight. The Bean is $147,000 for 384 sq ft. The Wakefield is $216,000 for 525 sq ft on one floor. The Summit is $235,000 for 654 sq ft. We'll read the parcel before we pick a larger plan.
- Do you do excavation in Portsmouth?
- Yes. Excavation and site work in Portsmouth are regular work, including tight downtown access and utility cuts on the Piscataqua. The number is (978) 987-0089.
- Do you install septic systems in Portsmouth?
- We'll check whether the lot is on city sewer or needs a septic design. When a lot needs septic, we price it from the site. This site has no New Hampshire septic starting price.
- Do you build custom homes in Portsmouth?
- Yes. A Portsmouth custom home starts at $325 per sq ft, and the land is extra. A downtown parcel and a lot farther out are different builds, and we read the lot before we price it. Call (978) 987-0089.
- Are ADUs allowed in Portsmouth?
- HB 577 requires Portsmouth to allow one ADU by right in single-family districts, and the town must permit a detached unit, and it bars a living-area cap below 750 sq ft. A downtown lot can still limit the footprint. We read the ordinance when we see the parcel.
- How do I get a quote in Portsmouth?
- Start with the form or call (978) 987-0089. Hours are 7:00 to 6:00 weekdays and 8:00 to 2:00 Saturday at 621 Wakefield Road, West Newfield, ME 04095.
Thinking about building in Portsmouth?
Tell us the street and we will read the access and the utilities before we price it. dylan@langonesiteservices.com