The Town of Hudson's building inspector at 12 School Street issues permits for a Hillsborough County town of around twenty-six thousand on the east bank of the Merrimack, directly across the river from Nashua and directly north of the state line. That position — second-largest town in the state by some counts, with a commercial frontage serving cross-border traffic and a residential base commuting in three directions — makes it a busier permitting market than its size implies.
The geography creates a recurring problem worth naming. A contractor working in Hudson may have worked in Nashua across the bridge that morning and in the neighbouring state that afternoon, and only New Hampshire's framework applies here: the state building code under RSA 155-A with its own amendments, its own trade licensing through the state licensing office, and its own appeal routes. Nashua's fillable-PDF filing practice is Nashua's; the neighbouring state's code edition is that state's. And the name is shared with a far better-known river valley elsewhere, whose jurisdictions are unrelated.
This guide covers the Town of Hudson in Hillsborough County, New Hampshire. Nashua across the river, Litchfield, Londonderry and Pelham are separate municipalities with their own building officials; the state line runs along the southern boundary; the better-known valley of the same name elsewhere is unrelated; and no New Hampshire county issues building permits in practice.
Three frameworks meet here; one of them applies. A Hudson job sits within a few miles of Nashua's process and of another state's code entirely. Only New Hampshire's state building code, amendments, trade licensing and appeal routes apply inside the town — not the practice from across the bridge, and not the rules from across the line. Confirm which jurisdiction a piece of advice came from before acting on it.
What requires a building permit in Hudson?
New Hampshire applies one code everywhere and leaves the enforcing to the town. Under RSA 155-A all buildings, building components and structures constructed in New Hampshire must comply with the state building code and the state fire code — there is no opting out of the standard. What varies is who administers it: a municipality takes on permitting and inspection only by adopting an enforcement mechanism under RSA 674:51, and a good number of New Hampshire towns never have. The code itself is the twenty twenty-one international building, residential, existing building, plumbing, mechanical and swimming pool codes with the twenty eighteen energy code and the twenty twenty-three National Electrical Code, all with New Hampshire amendments, in force since the first of July twenty twenty-four. So in Hudson the questions are whether the municipality enforces, what it has amended, and the river to the west and the state line to the south.
Two statutory rules shape every New Hampshire project and neither is in the model code. The first is a lock on the edition: the state building code in effect when the permit application is received by the governing authority remains in effect for the duration of the work covered by that permit, so a long project is not overtaken mid-build by a new code. The second is the concurrency period: for six months after a new edition takes effect an applicant may elect to show compliance under either the old code or the new one — but not a combination of the two. Beyond that, the code draws the ordinary permit line: construction, alteration, renovation, repair, removal and demolition are covered; ordinary repairs are not.
Typically permit required
- Construction, alteration, addition, demolition and change of occupancy, on a permit before work begins
- Electrical, plumbing and mechanical work, each by a tradesperson licensed by New Hampshire
- The state's shoreland or wetlands approval on the river frontage and the wetland parcels
- 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 mechanical 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
New Hampshire lets a municipality amend the state building code, and then puts a check on it. Local amendments are adopted by the legislative body under RSA 674:51, but since the twenty twenty-two amendment to that statute a local ordinance amending the code may not be enforced unless it has been confirmed by the state Building Code Review Board, which publishes the amendments it confirms. Issuing permits and collecting fees are not themselves amendments and need no confirmation. A municipality that has adopted an enforcement mechanism may contract the work to a local enforcement agency or a qualified third party rather than employ its own building official, and that contractor holds the same authority as a building inspector. Appeals from a local official go to the municipality's own building code board of appeals; appeals from the State Fire Marshal go to the Building Code Review Board. Beyond that, the river to the west and the state line to the south, the cross-border commercial frontage, and the shoreland approvals the river brings.
Who handles permitting in Hudson?
The building inspector is the permitting authority inside the town, administering the New Hampshire State Building Code through the enforcement mechanism Hudson has adopted, with plan review, permit issue and inspection locally. The State Fire Marshal permits state, university and community college buildings and runs pre-construction review on projects that reach its list, 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 | Hudson building inspector |
| Office | 12 School Street, Hudson, NH 03051 |
| Phone | (603) 886-6005 |
| Bounded by | The Merrimack River to the west; the state line to the south |
| Not this jurisdiction | Nashua across the river; the valley of the same name elsewhere |
| Trade licences | Office of Professional Licensure and Certification, statewide |
Permit types
Residential permits
A Hudson house project files with the building inspector with the trades on their own permits and New Hampshire licences on the tradespeople. On the river frontage the state environmental department's shoreland approval comes before the local permit, and on the wetland parcels inland the same department's wetlands approval does. The statutory position holds here as everywhere in the state: the contractor carries the duty to meet the code, and the town cannot be held liable for their failure.
How New Hampshire contractor credentials work
New Hampshire issues no general contractor licence. A builder needs no state credential to take on a house, and the statute puts the duty squarely on them anyway: the contractor is responsible for meeting the minimum requirements of the state building code and state fire code, and no municipality may be held liable for a contractor's failure to comply. The trades are licensed through the Office of Professional Licensure and Certification: electricians under the electricians' board, plumbers under the plumbers' board, and gas fitters and mechanical trades under the licensing required by RSA 153:27. In Hudson the credential is checked at permit issue where the municipality enforces, and where it does not the licence requirement still applies to the tradesperson doing the work.
Commercial permits
Commercial work in Hudson — the Route 102 and Lowell Road corridors, the industrial parcels and the retail frontage that serves traffic from across the river and across the line — runs through the same office with the state fire code alongside. Larger retail and assembly projects reach the State Fire Marshal's pre-construction review list, which is a state process rather than a local one and runs on the state's timetable.
The state permits that sit outside the town
Several New Hampshire approvals come from the state rather than the municipality, and they are the ones most often missed. The Shoreland Water Quality Protection Act requires a permit from the Department of Environmental Services for construction, excavation and filling within two hundred and fifty feet of a protected water body — a state permit, not a local ordinance. Wetlands work and subsurface sewage approval run through the same department. The State Fire Marshal permits, inspects and certifies buildings owned by the state, the university system and the community college system wherever they stand, and operates the State Building Permit Program for municipalities without a code enforcement mechanism that have asked for help in writing. In Hudson the Merrimack River along the western boundary brings the state environmental department's shoreland approval ahead of the local permit, the wetlands inland bring its wetlands approval, and the state line along the southern edge puts an entirely separate code framework within a few minutes' drive of most of the town.
Hudson permit costs and fees
Hudson charges building and trade permit fees under the town's schedule, with the state's own approvals charged by the department that issues them and fire review where a project reaches the state's list.
| Item | Fee or rule |
|---|---|
| Building permit | On the declared construction value, per the town's schedule |
| Trade permits | Separate electrical, plumbing and mechanical fees |
| State permits | Shoreland, wetlands and sewage approvals through the environmental department |
| Fire review | State fire code review where the project reaches the pre-construction list |
| Planning and zoning | Board application fees where the project reaches them |
| Trade licences | New Hampshire licences; a neighbouring state's licence does not transfer |
The shoreland permit is the state's, not the town's. On the Merrimack frontage the shoreland approval comes from the state environmental department under the Shoreland Water Quality Protection Act, not from the town, and it applies within two hundred and fifty feet of the protected water. It runs on the state's timetable rather than the building inspector's, which makes it the item to start first on any riverside project.
Trade permits and who may pull them
Trade work is permitted separately where the municipality enforces, and carried out by tradespeople holding the state licence their trade requires. New Hampshire declines to enforce arc-fault protection beyond the twenty fourteen electrical requirements, whichever edition of the electrical code the state has adopted.
Permit required
- Electrical — by an electrician licensed by the state electricians' board
- Plumbing — by a plumber licensed by the state plumbers' board
- Gas fitting and mechanical — under the state licensing required by RSA 153:27
- Fire protection — under the state fire code, with the fire marshal's review where it applies
Typically exempt
- Arc-fault protection beyond the twenty fourteen electrical requirements, which is not enforced in New Hampshire
- Like-for-like replacement the adopted code places below the permit threshold
How to apply for a Hudson building permit
Permitting exists locally only where an enforcement mechanism has been adopted under RSA 674:51; the code applies either way.
A local amendment 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 the trades on their own permits, then the certificate of occupancy.
Review, corrections and what actually causes delay
The building inspector reviews for the state building code with the state fire code alongside, and the town's boards take site plan and subdivision review where the project reaches them. What delays a Hudson project is advice imported from across the river or across the line, and a riverside design drawn before the state shoreland approval was sought.
Inspections in Hudson
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 forty-eight hours ahead, non-compliant work draws a written order to correct, and the re-inspection carries its own fee. Hudson inspections are requested from the building inspector against the permit number, with each trade inspected on its own permit and a certificate of occupancy at the close.
Hudson permit search and official resources
- 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
- State Building Permit Program — the fire marshal's permitting and pre-construction review
- 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
Frequently asked questions
Who issues building permits in Hudson?
The town's building inspector at 12 School Street. No New Hampshire county issues building permits in practice.
Does Nashua's process apply here?
No. Nashua is a separate city across the river with its own filing practice. Only Hudson's process and New Hampshire's state framework apply inside the town.
Does my licence from the next state over work here?
No. New Hampshire licenses electricians, plumbers and gas fitters through its own boards, and a neighbouring state's licence does not transfer.
Who issues the shoreland permit on the river?
The state environmental department, under the Shoreland Water Quality Protection Act, within two hundred and fifty feet of the protected water. It is a state permit, not a town one.
Which code applies?
The New Hampshire State Building Code — the twenty twenty-one international codes with the twenty eighteen energy code and the twenty twenty-three electrical code, in force since the first of July twenty twenty-four.
Which Hudson is this?
Hudson in Hillsborough County, New Hampshire, on the east bank of the Merrimack. The better-known river valley of the same name elsewhere is unrelated.
Simplify Hudson permitting with Alliance Permitting
Hudson sits where three frameworks meet and only one governs. We file under New Hampshire's, put state licences on the trades, and start the shoreland approval before the riverside design is drawn.
Ready to break ground in Hudson sooner?
Send us the scope and the parcel. We confirm the review path with the Hudson building inspector, assemble the submittal, file it, and track it through issuance — corrections included.
More New Hampshire permitting guides
More New Hampshire permitting guides
This guide is provided by Alliance Permitting for general information about Hudson permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.