Short answer: yes. The longer answer — what it costs in Nashua (a line item on any furnace replacement quote), who is actually licensed to do the work in New Hampshire, and how to check a contractor in about ten minutes — is where most homeowners are flying blind.
📞 Call (603) 506-4389Last checked: August 6, 2026 • Verified against the City of Nashua fee ordinance and the NH Office of Professional Licensure and Certification
Yes — replacing a furnace or boiler in New Hampshire requires a permit, and the finished work is inspected. In practice that means two things: a mechanical permit from your city or town's building department, and a fire department permit and inspection, which are required for the installation of wood, oil and gas heating equipment. In Nashua the mechanical permit is filed with the Department of Building Safety, which reviews the application and inspects the installation. Your contractor should file both. If you are being asked to handle it yourself, something is off.
The licensing half of the question is where things get genuinely surprising, and it is the single most misunderstood fact about hiring HVAC help in this state: New Hampshire issues no general statewide HVAC contractor license for non-gas work. There is no universal credential a heating and cooling company holds the way an electrician holds an electrician's license. What the state does license is fuel gas fitting — performed by a New Hampshire Licensed Gas Fitter — along with mechanical businesses that do gas, plumbing or hearth work. So when a company advertises itself as a licensed HVAC contractor in New Hampshire, that phrase almost always points to gas fitter licensure, a state mechanical business license, or a local registration, rather than one blanket HVAC license. Knowing which one is being claimed is what separates real verification from taking a website's word for it.
Nashua HVAC is a referral service: we connect homeowners in Nashua, Hudson and Pelham with licensed, insured local contractors, and the independent contractor — not this website — does the work and pulls the permits. That also means we have no installation to protect, which is why this page includes the verification steps a homeowner can run without us. Everything here is general information current as of August 2026, not legal advice; permit requirements and fees are set locally and licensing rules are set by the state, so confirm the specifics with your building department and with the New Hampshire Board of Mechanical Safety and Licensing before you sign anything.
As of August 2026, the City of Nashua charges a nonrefundable application processing and review fee of $50 for a residential mechanical permit, plus $45 for a furnace — the same $45 line covers a boiler, water heater, or HRV/ERV. A straightforward residential furnace or boiler replacement therefore prices out at about $95 in permit fees. Set that against a project that routinely runs into five figures and the honest conclusion is that the permit is a rounding error, which makes any pitch to skip it economically nonsensical on its face. A few caveats worth holding onto: additional appliances or gas piping add their own line items, commercial work is priced on a different schedule, and municipal fee schedules are amended by ordinance and do change. Before you budget from this page, confirm the current numbers with Nashua's Department of Building Safety at 603-589-3080 — a two-minute call that settles it for your specific scope.
The contractor pulls the permit. That is the professional norm, it is what the permit application is built around — Nashua's mechanical application has fields for the contractor and their license number — and it puts responsibility for code compliance on the party who actually understands the code. A homeowner who is asked to pull the permit on their own installation is quietly being handed the liability for someone else's work. Now the harder scenario: a contractor offers a lower price for skipping the permit, or waves it off as bureaucratic delay. Decline. On a $95 permit, the savings are not the point — the offer tells you the installer would rather not have an inspector look at the finished job, which is the most useful thing you will learn about them all day. The consequences arrive later and cost more. Unpermitted work surfaces at resale, when a buyer's inspection or an appraisal turns up a heating system with no permit history, and the cure is often retroactive permitting, corrective work, or a price concession right at the closing table. It can also complicate an insurance claim: if a fire or a carbon monoxide incident traces back to heating equipment installed without a permit or inspection, you have handed a carrier a reason to investigate rather than a record that establishes the work was done correctly. Manufacturer warranties frequently carry their own requirement that installation be performed by a licensed professional. None of these are certainties, and honest advice will not pretend otherwise — but every one of them is a risk you are accepting in exchange for skipping a fee smaller than a service call.
Once you know what to look for, the good version is easy to recognize. The written quote itemizes the equipment by manufacturer and model number, states the total price, and lists permit fees as a line item rather than burying them or omitting them. The contractor's business name and license number appear on the document. Before work begins, the contractor files the mechanical permit with the building department and arranges the fire department permit and inspection for the new oil or gas equipment. On installation day the crew that shows up works for the company you hired, or you were told in advance about the subcontractor. Afterward, an inspector visits, signs off, and you receive — or can request — a copy of the closed permit for your own records, alongside the manufacturer warranty registration. Keep that paperwork with your house documents; it is worth real money the day you sell. The counter-pattern is just as recognizable: verbal-only pricing, an unexplained cash discount, pressure to decide today, no license number anywhere, and a permit that nobody quite gets around to mentioning. You do not need to be an HVAC expert to sort these two apart, which is precisely the point of a permit system.
Call (603) 506-4389 and get connected with a licensed, insured local contractor who handles the permit and inspection as part of the job.
Call (603) 506-4389Yes. A furnace or boiler replacement requires a mechanical permit from your local building department, and a fire department permit and inspection are required for the installation of wood, oil and gas heating equipment. Your contractor should file both and schedule the inspection — you should not have to pull your own permit for professional work. Requirements and fees are administered locally, so confirm the details with your city or town office for your specific project.
Use the license lookup published by the New Hampshire Office of Professional Licensure and Certification at oplc.nh.gov, and search both the technician's name and the business name. Understand what you are checking, though: New Hampshire does not issue a general statewide HVAC contractor license for non-gas work, so what you will find is fuel gas fitter licensure for individuals and a mechanical business license for companies doing gas, plumbing or hearth work. Verify that the license exists, that its status is active, and that it has not expired. If a contractor cannot give you a license number to look up, that is your answer.
As of August 2026, Nashua charges a nonrefundable $50 application processing and review fee for a residential mechanical permit plus $45 for a furnace, boiler, water heater or HRV/ERV — roughly $95 for a standard residential replacement. Additional appliances or gas piping add line items, and commercial projects follow a different schedule. Municipal fee schedules are amended by ordinance, so confirm current amounts with Nashua's Department of Building Safety at 603-589-3080 before budgeting.
Most often nothing happens immediately, which is exactly why the practice persists — the problem shows up later. Unpermitted heating equipment commonly surfaces during a sale, when a buyer's inspection or an appraisal finds no permit history, and resolving it can mean retroactive permitting, corrective work, or a price concession at closing. It can also give an insurer grounds to scrutinize a claim tied to that equipment, and some manufacturer warranties require licensed installation. If you have inherited unpermitted work, start by calling your local building department and describing the situation; many jurisdictions have a path to inspect and permit after the fact, and asking is far cheaper than discovering it under deadline.
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