The City of Nashua's Building Safety Department at 229 Main Street issues permits for the state's second city, a Hillsborough County municipality of around 92,000 on the Merrimack at the state line. The office runs from eight to five on weekdays, but the permit desk closes at half past four and inspection hours start at half past eight — three different clocks in one department, and worth knowing before a trip.
The filing method is specific. Every application needs the city’s Building and Land Use Application with one paper and one electronic set of plans, submitted by post, through the after-hours drop box at the Elm Street entrance to City Hall, or in person at the permit desk. Commercial submittals may also be emailed to the department’s permits address, with one paper set delivered to City Hall. The forms are published as fillable PDFs, which the city notes will not work on a phone or mobile device. Fees are paid by post, through the drop box, or by card over the phone or in person, and are set by city ordinance rather than by an internal schedule, which makes them a matter of public record rather than a counter enquiry.
This guide covers the City of Nashua in Hillsborough County. Hudson across the river, Merrimack, Amherst, Hollis and Litchfield are separate municipalities with their own building officials; the state line runs along the city's southern edge; and no New Hampshire county issues building permits in practice.
There is no portal, and the forms will not work on a phone. Nashua applications go in on paper with an electronic plan set alongside — by post, through the drop box at the Elm Street entrance to City Hall, or at the permit desk; only commercial submittals may be emailed, and they still need a paper set delivered. The city states plainly that its fillable PDF forms will not work on a phone or mobile device. Arriving at the counter after half past four finds the permit desk closed even though the office is open.
What requires a building permit in Nashua?
In Nashua the questions are whether the municipality enforces, what it has amended, and the paper filing with an electronic plan set and the permit desk that closes early.
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- Construction, alteration, addition, demolition and change of occupancy, on the department's own application forms
- Electrical, plumbing and mechanical work, each on its own permit by a state-licensed tradesperson
- Fees as set by city ordinance rather than by an internal schedule
- New construction and renovation, on a permit obtained before work begins under RSA 155-A:4
- Alteration, renovation, rehabilitation, repair, removal and demolition of buildings previously erected
- Electrical, plumbing and gas work, by tradespeople licensed by the state
Often exempt
- Ordinary repairs that do not alter structure, egress, fire protection or building systems
- Painting, papering, flooring, cabinets and similar finish work
- Ordinary repairs that do not alter structure, egress, fire protection or building systems
- A tent of any size erected as an accessory structure at an owner-occupied one- or two-family dwelling
- Painting, papering, flooring, cabinets and similar finish work
What the municipality may change, and what it may not
Locally, what stands out is the paper filing with an electronic plan set, the permit desk that closes before the office, and the state line along the southern edge of the city.
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
Who handles permitting in Nashua?
The Building Safety Department is the permitting authority inside the city, administering the New Hampshire State Building Code through the enforcement mechanism Nashua has adopted, with plan review, permit issue and inspection in-house. The State Fire Marshal permits state, university and community college buildings, the environmental department issues shoreland, wetlands and sewage approvals, and the Office of Professional Licensure and Certification licenses electricians, plumbers and gas fitters statewide.
| Detail | Information |
|---|---|
| Department | Nashua Building Safety Department |
| Office | 229 Main Street, Nashua, NH 03060 |
| Phone | (603) 589-3080 |
| Filing | Building and Land Use Application with one paper and one electronic plan set, by post, drop box or in person; commercial submittals may be emailed to permits@nashuanh.gov with one paper set delivered |
| Hours | Office 8:00 am to 5:00 pm; permit desk to 4:30 pm; inspections from 8:30 am |
| Fees | Set by city ordinance |
Not sure this scope needs a permit?
Get a free quote →In 2025, building permits issued in Nashua authorized 62 new privately owned housing units, 60 of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
Permit types
Residential permits
A Nashua house project completes the application on a desktop, then delivers it with one paper and one electronic plan set by post, through the City Hall drop box or at the permit desk, with the trades following on their own permits. The city sits on the state line, so a contractor working both sides moves between two entirely different code frameworks in the space of a few miles — a point worth settling explicitly rather than assuming the neighbouring practice carries across.
Commercial permits
Commercial work in Nashua — the downtown and the Main Street corridor, the technology and light industrial parks along the turnpike, and the retail frontage that serves shoppers from across the state line — runs through the same department with the state fire code alongside and the fire marshal's review where a project reaches the state's pre-construction review list. The edition lock under RSA 155-A holds the code steady for the life of a multi-year build.
The state permits that sit outside the town
In Nashua the Merrimack and the Nashua River bring shoreland and flood questions to the low ground and the mill frontage, the state line runs along the southern edge of the city, and the retail corridors carry a commercial permitting load out of proportion to the residential base.
New Hampshire has no general contractor licence; the contractor carries the duty to meet the state codes, and the trades hold state licences. New Hampshire rules
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Call 1-855-478-4290 →Nashua permit costs and fees
Nashua's permit fees are set by city ordinance, with separate electrical, plumbing and mechanical permits and the state's own approvals charged by the department that issues them.
| Item | Fee or rule |
|---|---|
| Building permit | Per the fee ordinance the city has adopted |
| Trade permits | Separate electrical, plumbing and mechanical fees |
| Plan review | Carried out by the Building Safety Department |
| State permits | Shoreland, wetlands and sewage approvals through the environmental department |
| Fire review | State fire code review where the project reaches it |
| Records | Permit records held by the department |
Two code frameworks, a few miles apart. Nashua's southern boundary is the state line, and a contractor who works both sides is moving between two entirely different code and licensing frameworks — different adopted editions, different amendment mechanisms, different trade licensing. Nothing about a neighbouring jurisdiction's process carries across, and pricing a job on the wrong side's assumptions is the commonest error in this market.
Trade permits and who may pull them
Permit required
- Electrical — by an electrician licensed by the state electricians' board
- Plumbing — by a plumber licensed by the state mechanical licensing board
- Gas fitting — by a gas fitter licensed by the state mechanical licensing board
- Fire protection — under the state fire code, with the fire marshal's review where it applies
Typically exempt
- Arc-fault protection beyond the 2014 electrical requirements, which is not enforced in New Hampshire
- Like-for-like replacement the adopted code places below the permit threshold
Rather not deal with the building department?
Get a free quote →Trade work follows the town’s permit process where the town enforces, and is done by tradespeople holding the state licence their trade requires. New Hampshire rules
How to apply for a Nashua building permit
Permitting exists locally only where an enforcement mechanism has been adopted under RSA 155-A:3; the code applies either way.
A local amendment may cover only administrative matters, is unenforceable unless the Building Code Review Board has confirmed it, and the board publishes what it confirms.
Shoreland, wetlands and subsurface sewage approvals come from the environmental department, not from the town.
Electricians, plumbers and gas fitters are licensed by the state; there is no general contractor licence, and the contractor carries the compliance duty.
The code in effect when the application is received governs the whole of the work; during a concurrency period elect one edition, not a blend.
Footing to final, with trade inspections as the town requires, then the certificate of occupancy where the town issues one.
Review, corrections and what actually causes delay
The Building Safety Department reviews the application and plans against the state building code, with the state fire code alongside. What delays a Nashua project is a residential application emailed without the paper set, a form attempted on a phone, a submission that misses the permit desk hours, and an assumption imported from across the state line.
Want this handled start to finish?
Get a free quote →Inspections in Nashua
Where the municipality enforces, inspections follow the code's sequence — footing, foundation, framing, rough trades, insulation and final — requested from the building official by permit number, with the trades inspected on their own permits and a certificate of occupancy at the end. Where the State Building Permit Program covers the work instead, inspections are booked with the State Fire Marshal's office at least 48 hours ahead, non-compliant work draws a written order to correct, and the re-inspection carries its own fee. Nashua inspections run from half past eight to half past three on weekdays, requested through the city’s online request form or by email to the permits address, booked against the permit number, with each trade inspected on its own permit and a certificate of occupancy at the close.
Nashua permit search and official resources
- Nashua permits — the application forms and the fee ordinance
- Nashua Department of Building Safety — how to submit, plan sets, payment and the office, permit desk and inspection hours
- New Hampshire State Building Code — the adopted editions and the statewide amendments
- RSA chapter 155-A — the statute on the code, permits, enforcement and appeals
- New Hampshire State Building Code — the adopted editions, the amendments and RSA 155-A
- State Building Permit Program — the fire marshal's permits, inspections and certificates where a municipality does not enforce
- RSA chapter 155-A — the statute on the code, permits, enforcement and appeals
Inspections are where schedules slip.
Get a free quote →Frequently asked questions
Who issues building permits in Nashua?
The city's Building Safety Department at 229 Main Street. No New Hampshire county issues building permits in practice.
Is there an online portal?
No. Applications go in with one paper and one electronic plan set by post, through the drop box at the Elm Street entrance to City Hall, or in person; commercial submittals may also be emailed to permits@nashuanh.gov with one paper set delivered.
Can I complete the form on my phone?
No. The city states the forms will not work on a phone or mobile device; download and complete them in a desktop browser.
When is the permit desk open?
Weekdays from eight in the morning to half past four, half an hour before the office itself closes. Inspection hours start at half past eight.
Which code applies?
Nashua’s Building Safety Department reviews against New Hampshire’s code, whose building, residential, plumbing and mechanical codes are the 2024 editions as of July 1, 2026; the energy code is still the 2018 edition and the electrical code the 2023 one. Applications in by year-end 2026 may choose the 2021 editions as a complete set, not piece by piece (state edition list).
Does the neighbouring state's process apply near the line?
No. Nashua's southern boundary is a state line, and the code, amendment and trade licensing frameworks on the far side are entirely separate.
Simplify Nashua permitting with Alliance Permitting
Nashua’s process runs on paper and a permit desk. We complete the forms the way the department expects, deliver the plan sets inside the permit desk hours, and keep the state-line assumptions out of the file.
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More New Hampshire permitting guides
More New Hampshire permitting guides
This guide is provided by Alliance Permitting for general information about Nashua permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.