Somersworth, New Hampshire Building Permit Guide

In Somersworth, building, electrical, plumbing and mechanical permits come from the city’s Office of Code Enforcement at City Hall (603-692-9520), and applications are filed in the SmartGov online portal or in person. Under fees the City Council adopted on May 4, 2026, a building permit costs a $50 application fee plus $10 per $1,000 of construction cost, and the city says building permits typically take five to seven business days to process.

What needs a permit in Somersworth?

The city’s rule is that all work requires a permit unless the Office of Code Enforcement tells you otherwise. Projects are filed on one of two building applications: a Major Building Permit or a Minor Building Permit. Electrical, plumbing and mechanical work each need their own permit and inspections.

The city’s permit list also names balconies, fireplaces, retaining walls, new or replacement furnaces and water heaters, demolition and septic repair or replacement. Work in the public right of way, which runs from the curb to the property line and can reach 20 feet from the curb, needs its own permits for tree planting, driveways, grade changes, irrigation, dumpsters and sidewalks; call 603-692-9520 for the full list.

Who issues building permits in Somersworth?

The Office of Code Enforcement, part of the city’s Department of Development Services, issues and inspects building permits throughout Somersworth; Strafford County does not issue building permits. Jeffrey Gallant is the Code Enforcement Officer and also serves as the city’s Health Officer.

Applying through SmartGov

Somersworth’s SmartGov online permitting system went live in July 2026. In the public portal you create an account, choose the permit type, enter the project and contractor details, upload plans, sketches and photos, sign electronically and pay the fee. The portal links to the city’s GIS map, so you can check the zoning district, historic district boundaries and flood zones before you apply. Paper applications are still accepted at City Hall, and the city publishes a SmartGov user guide.

The city’s permit forms include the following; the building, trade and demolition applications were revised in May or June 2026:

• Major Building Permit Application and Minor Building Permit Application.
• Electrical, Plumbing and Mechanical Permit Applications, with the New Hampshire master licence number of the electrician or plumber, or the mechanical licence and endorsement.
• Demo Permit Application.
• Septic System Location Approval Application and Water-Sewer Connection Permit.
• Residential, Commercial & Business and Change of Use Certificate of Occupancy applications.

Both building applications ask whether the lot is in the Historic District or the Flood Hazard Area and whether the work is within 150 feet of a jurisdictional wetland; the Major application also asks about the Ground Water Protection District, an approved site plan, a subdivision and Current Use.

Somersworth permit fees

The City Council adopted Ordinance 12-26, amending the Chapter 20 building permit fee schedule and the re-inspection fee, on May 4, 2026 by an 8–0 vote, and the ordinance took effect on passage; the city’s land use fee notice dated July 1, 2026 repeats the same rates. The previous residential rate was a $25 application fee plus $9 per $1,000 of construction cost.

For example, a new house with a construction cost of $300,000, labor included, has a building permit fee of $50 plus 300 × $10, or $3,050; the electrical, plumbing and mechanical permits are charged on top. Third-party inspections required on commercial or industrial projects are paid by the applicant.

The May 2026 building application forms still say a $25 re-inspection fee applies after an inspection fails twice for the same reason, but Ordinance 12-26 replaced that $25 fee with $50. Planning-side fees in the same notice include $25 for a Historic District application, $50 for a sign permit, $75 for a home occupation permit and $100 for a Zoning Board application.

Electrical, plumbing and mechanical permits

Electrical, plumbing and mechanical work each require their own permit and inspections from the Office of Code Enforcement, at $50 plus $10 per $1,000 of the cost of that work. The electrical application asks for the New Hampshire master electrician’s licence number and the plumbing application for the master plumber’s; commercial electrical work may need an escrow. The mechanical application records the fuel type, the mechanic’s licence and endorsement, and an oil burner, tank or line also needs a Fire Department permit and inspection.

For commercial projects, the Fire Department receives plans when it requires them; the Code Enforcement Officer can say when that applies. The City Engineer, Code Enforcement Officer, City Planner or Fire Chief may also require third-party inspections.

What to attach to a Major Building Permit

A foundation certification is due before the certificate of occupancy, and the city advises getting it done as soon as possible. Minor permits need a sketch plan showing the work and, for fences, their location, although some minor projects need a full set of plans.

How to get a Somersworth building permit

Somersworth inspections

The owner or contractor requests each inspection in SmartGov or by calling 603-692-9520. The Inspections page asks for at least 24 hours’ notice, and the trade and demolition permit forms ask for 48 hours. A phone request should give your name and number, the permit number, the project address, the type of inspection and whether you want a morning or an afternoon visit.

The city’s inspection sequence for a major project is plan review, setback and footing, rough structural, rough plumbing, rough electrical, rough mechanical, final electrical, final mechanical, final construction and certificate of occupancy compliance. The building inspector’s own visits are footing, foundation or pier depth, foundation drains, rough framing, insulation and final. Rough-in inspections should be coordinated so that all the inspectors are on site at the same time, and work covered before inspection may have to be opened up.

A certificate of occupancy must be issued before anyone occupies a new home or commercial building or any building whose use has changed; commercial projects must submit electronic as-built plans first, and non-residential occupancy certificates must be displayed. A permit expires one year after it is issued unless the Code Enforcement Officer grants a written extension, becomes invalid if work does not start within 180 days or stops for 180 days, and is renewed in person at the Code Enforcement Office.

Local Somersworth details

Fee overhaul: the May 2026 fee change replaced item-by-item counts, such as counting plumbing fixtures, with a single value-based fee for each permit, timed to match the SmartGov launch.

Historic District: projects in the Historic District need a Historic District Commission application ($25), and the building application asks for the HDC number.

Septic systems: the city issues subsurface disposal permits and inspects the bed bottom ($35 each), and a new building on septic needs a septic design approved by the NHDES Subsurface Systems Bureau with the building application.

Energy code: the city’s forms note the state requirement for energy code compliance on any new structure or addition over 150 sq ft, documented with an EC-1 form.

New Hampshire building code

Every building in New Hampshire must meet the state building and fire codes (the 2024 codes since July 2026). Only towns that have adopted an enforcement mechanism issue local permits, and any local amendment must be administrative and confirmed by the state. New Hampshire rules

Somersworth building permit FAQ

Who issues building permits in Somersworth?

The city’s Office of Code Enforcement at City Hall, One Government Way (603-692-9520).

Can I apply for a Somersworth permit online?

Yes. SmartGov has taken applications, payments and inspection requests since July 2026; paper applications are still accepted at City Hall.

How much is a building permit in Somersworth?

$50 plus $10 per $1,000 of construction cost, or $12 per $1,000 of materials value when labor is not included. Electrical, plumbing and mechanical permits are $50 plus $10 per $1,000 of that work.

Do I need a permit for a deck, shed or fence?

Yes. Decks, sheds, fences, roofing, siding, windows and doors are filed on the Minor Building Permit Application with a sketch plan.

How long does review take?

The Code Enforcement page says building permits typically take five to seven business days to process. The city’s What Needs a Permit? page gives an average of 2 to 10 working days, depending on the inspector’s workload and a complete application, and the May 2026 application forms say 3 to 5 business days.

What happens if I start work without a permit?

You pay the permit fee and may also be charged a penalty equal to the fee, up to $500.

What building code does Somersworth enforce?

The New Hampshire State Building Code. The 2024 International Building and Residential Codes, the 2018 energy code and the 2023 National Electrical Code apply from July 1, 2026, and until December 31, 2026 an applicant may choose the 2021 codes for the whole job instead.

Official Somersworth permitting resources

• NH Department of Environmental Services
• New Hampshire State Building Code statute (RSA 155-A)
• Somersworth Office of Code Enforcement
• Somersworth: what needs a permit
• Somersworth SmartGov online permitting portal
• Somersworth permit applications and forms
• Somersworth Major Building Permit Application, May 2026 (PDF)
• Somersworth Minor Building Permit Application, May 2026 (PDF)
• Somersworth Notice of Land Use Board Fees, effective July 1, 2026 (PDF)
• Somersworth inspections
• Somersworth City Council minutes, May 4, 2026: Ordinance 12-26 (PDF)

Simplify Somersworth permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in New Hampshire. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Somersworth permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.