New Hampshire HVAC License Requirements (2026) | Mechanical Licensing Board Guide

New Hampshire does not issue a standalone state HVAC contractor license. Pure mechanical and ductwork installation is regulated through municipal permitting under the State Building Code (which adopts the International Mechanical Code). Any work involving fuel gas piping, gas-fired equipment connection, or gas appliance servicing requires a Gas Fitter license issued by the New Hampshire Mechanical Licensing Board under RSA 153. The Mechanical Licensing Board issues tiered Gas Fitter credentials covering natural gas and LP gas, with apprentice, journeyman, and master tiers. Any HVAC work involving refrigerants additionally requires federal EPA Section 608 certification.

Governing Authority

New Hampshire Office of Professional Licensure and Certification (OPLC) — trade boards (OPLC) administers and enforces this credential under the authority of New Hampshire RSA 319-C (Electricians), RSA 329-A (Plumbers), RSA 153 (Mechanical/Gas Fitters); administrative rules Elec 100–600, Plu 100–600, Saf-C 6000 series. New Hampshire does not license general contractors at the state level. Trade boards under the OPLC umbrella license individual electricians, plumbers, and gas fitters statewide. Mechanical/HVAC work intersects the Gas Fitters Board (for fuel gas piping) and local mechanical permitting; pure HVAC ductwork is not separately state-licensed. New Hampshire is unusual in the Northeast for combining strict individual trade licensing with no general contractor license at all — accountability for general construction sits at the municipal building department and through civil contract law. Home improvement contractors are not registered or bonded by the state; consumer protection runs through RSA 358-A (Consumer Protection Act) enforced by the Attorney General. Always confirm current rules with OPLC and the local building official before bidding work. Overview of the New Hampshire licensing landscape: New Hampshire takes a deliberately light-touch approach to construction trades regulation compared to its neighbors. There is no statewide general contractor license, no statewide home improvement contractor registration program (unlike Massachusetts HIC or Rhode Island contractor registration), and no statewide building permit. Instead, the state relies on three pillars. First, the building code: New Hampshire adopted the State Building Code under RSA 155-A, which incorporates the International Building Code, International Residential Code, International Mechanical Code, International Plumbing Code, International Energy Conservation Code, and the National Electrical Code by reference. The State Fire Marshal enforces the State Building Code in jurisdictions that have not adopted local enforcement, while most populated municipalities run their own building departments and issue their own permits. Second, individual trade licensing: the Electricians Board, the Plumbers Board, and the Mechanical Licensing Board (Gas Fitters) license journeyman and master tradespeople under their respective statutes. These licenses are personal to the individual and follow the worker between jobs and between employers. Third, consumer protection law: home improvement disputes are handled through RSA 358-A and standard contract law, not through a state license bond pool. What this means in practice for contractors: a self-employed builder in New Hampshire can legally bid and build a single-family home without any state-issued license, provided every electrical worker on site holds a current Electricians Board license, every plumber holds a current Plumbers Board license, every gas fitter holds a current Gas Fitters Board license, the project clears the local building department permit, and the work passes all required inspections. The contractor may still need a federal EIN, state business registration with the Secretary of State, business profits and enterprise tax accounts with the New Hampshire Department of Revenue Administration, and (if hiring) workers compensation coverage under RSA 281-A. The Department of Labor enforces workers compensation aggressively, and uninsured employers face stop-work orders. Municipal nuances matter. Manchester, Nashua, Concord, Portsmouth, Dover, and Keene each operate full building departments with their own permit application packets, contractor sign-in requirements, and inspection schedules. Some towns require the contractor to be listed on the permit; some require proof of insurance before issuing the permit; a few smaller towns have no building inspector at all and rely on the State Fire Marshal. Always call the building department before assuming a project does not need a permit. Electrical and plumbing permits are typically pulled by the licensed tradesperson, not the general contractor, and the inspection is performed by the municipal inspector or by the State Electrical or State Plumbing inspector in unincorporated areas. Reciprocity is meaningful here. The Electricians Board holds reciprocal agreements with several New England states for master and journeyman credentials, as does the Plumbers Board. The Mechanical Licensing Board recognizes equivalent gas fitter credentials from neighboring states on a case-by-case basis. Reciprocal applicants still pay New Hampshire fees, submit a New Hampshire application, and in most cases sit for the New Hampshire-specific portion or the full New Hampshire exam. Renewal cycles vary by board (electricians and plumbers renew on a three-year cycle; gas fitters renew on a two-year cycle), and continuing education requirements are set by each board. Because New Hampshire publishes most rules and forms only on the OPLC website and the General Court statute pages, contractors should bookmark oplc.nh.gov and gencourt.state.nh.us and check both before paying any fee or scheduling an exam. Rates and fee amounts in this guide should be confirmed directly with the relevant board before submitting payment.

Official portal: https://www.oplc.nh.gov/
Address: 7 Eagle Square, Concord, NH 03301
Phone: (603) 271-2152

Eligibility Requirements

To qualify, an applicant must have reached age 18 and hold a valid Social Security Number. No New Hampshire residency requirement.

Good moral character

The Mechanical Licensing Board reviews criminal history disclosures and may deny or condition a license for fraud, violence, or prior license discipline.

Background investigation

Mandatory criminal history disclosure on the application.

Experience & Education Matrix

Plan to substantiate 2 years of apprentice gas fitter: registered with the board while working under a licensed master. Journeyman gas fitter: typically two to four years and qualifying hours of fuel gas experience under a licensed master, set by board rule. Master gas fitter: additional journey-level experience after the journeyman credential. Pure HVAC ductwork experience does not have a state hour requirement because there is no state HVAC license — local building departments may set their own contractor expectations. with hard records. Payroll, tax, project logs, and supervisor verification are what the board relies on when it reviews the claim.

Accepted proof of experience or eligibility

Mechanical Licensing Board Experience Verification Form signed by each supervising master gas fitter
Apprenticeship completion certificate from a recognized program
W-2, 1099, or pay records covering the qualifying period
EPA Section 608 certification card for any refrigerant work

Education substitution

Approved apprenticeship and accredited HVAC/mechanical trade school programs may substitute for portions of the experience requirement under board rules. Confirm current substitution ratios with the Mechanical Licensing Board.

Examination Structure

Examinations are administered by PSI Services LLC under contract to the New Hampshire Mechanical Licensing Board (where applicable); board-administered exams in some cases. The applicant must pass the following examination parts before the license can issue:

New Hampshire Journeyman Gas Fitter Examination — International Fuel Gas Code, NFPA 54, NH gas fitting rules — 80 questions, 240 minutes, passing score 75%
New Hampshire Master Gas Fitter Examination — IFGC, NFPA 54, NH rules, business and law (Master applicants only) — 100 questions, 300 minutes, passing score 75%

Examination fee: Examination fees are set by PSI or the board and posted in the candidate information bulletin. Confirm the current fee before scheduling.

Retake policy: Failed examinations may be re-taken by paying a new exam fee. Each application remains valid for the period stated by the board (typically one year).

Insurance & Financial Security

The cited state source set does not require a contractor license surety bond for this credential. Contractors should still confirm project-specific bond, permit-bond, or public-works bond requirements before bidding.

General liability

The Mechanical Licensing Board does not impose a state-level general liability minimum on individual licensees. Self-employed HVAC and gas fitter contractors typically carry $1,000,000 per occurrence as a market standard.

Workers' compensation

Workers compensation coverage is mandatory under RSA 281-A for any employer with one or more employees. Sole proprietors with no employees are exempt but may elect coverage.

Additional financial requirements

No financial statement is required by the Mechanical Licensing Board.

Application and License Fees

Fee	Amount
Application (non-refundable)	$150
Examination	$100
Initial license	$150
Renewal (every 2 years)	$150

Maintenance & Renewal

Expect to renew the New Hampshire Gas Fitter (Mechanical Licensing Board) — no separate state HVAC license every 2 years. Renewal currently costs $150. New Hampshire Gas Fitter licenses renew on a two-year cycle. Lapsed licenses may require reinstatement fees and reapplication.

Continuing education: Continuing education in the IFGC, NFPA 54, and NH gas fitting rules is required each renewal cycle. The exact hour total is set by the Mechanical Licensing Board — confirm current requirements before renewal.

Downloadable Asset

2026 New Hampshire HVAC License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity and Endorsement

New Hampshire does not accept the NASCLA Accredited Examination for this classification.

Reciprocal State	Accepted Exam	Conditions
Maine	Gas Fitter exam	Recognition of Maine fuel board gas fitter credentials on a case-by-case basis. Confirm current terms with the NH board.
Vermont	Gas Fitter exam	Recognition of Vermont gas fitter credentials on a case-by-case basis.

Reciprocity for gas fitter credentials is handled case by case by the Mechanical Licensing Board. There is no state HVAC license to reciprocate. Confirm current terms with the board.

Weighing more than one jurisdiction? The national hub compares HVAC license requirements in every state — exam, bond, fee, and experience thresholds side by side.

Step-by-Step Application Roadmap

Decide which credentials you actually need. Pure ductwork and air-side mechanical work needs no state license — only municipal permits. Fuel gas work requires a Gas Fitter credential. Refrigerant work requires EPA 608.
Register as an Apprentice Gas Fitter (if doing gas work). File the apprentice registration with the Mechanical Licensing Board before performing gas piping or gas appliance work.
Obtain EPA Section 608 certification. Federal refrigerant handling certification is required for any work involving refrigerants regardless of state credential.
Accumulate qualifying gas fitting hours. Log experience under a licensed master gas fitter, meeting the board's hour requirement for the Journeyman tier.
Submit the Journeyman Gas Fitter application and pass the exam. File the application with experience verification and the application fee, then pass the IFGC/NFPA 54-based Journeyman exam.
Work as a Journeyman to qualify for Master. Accumulate the additional journey-level hours required for the Master Gas Fitter credential, then pass the Master exam.
Maintain credentials and municipal good standing. Renew on the board's two-year cycle, complete continuing education, and stay current with each municipality where you pull mechanical permits.

Pre-Submission Checklist

The items below are the ones worth confirming before the application is filed with OPLC:

☐ Decision on whether the project involves fuel gas, refrigerants, or pure ductwork
☐ Apprentice Gas Fitter registration with the Mechanical Licensing Board (if doing gas work)
☐ EPA Section 608 certification card (for any refrigerant work)
☐ Documented qualifying hours under a licensed master gas fitter
☐ Application form, application fee, and experience verification
☐ Journeyman or Master Gas Fitter exam pass certificate
☐ Workers compensation policy if employing other workers

Study and Reference Materials

What follows are the regulator-cited and commonly used preparation references for this trade. They appear here for convenience only; CLR takes no compensation for them.

International Fuel Gas Code (New Hampshire-adopted edition) — International Code Council. Primary technical reference for fuel gas work.
NFPA 54 National Fuel Gas Code — National Fire Protection Association. Co-adopted with the IFGC for gas piping and appliance connection.
International Mechanical Code (New Hampshire-adopted edition) — International Code Council. Governs air-side mechanical work under the State Building Code.
New Hampshire RSA 153 and Mechanical Licensing Board administrative rules — New Hampshire General Court / OPLC. Licensing law and rules.

Common Filing Mistakes

Drawn from the board instructions and sources cited on this page, the pitfalls below are the ones most likely to slow down or sink a New Hampshire HVAC application.

Assuming HVAC means one license

New Hampshire splits HVAC work across no-license ductwork, Gas Fitter for fuel gas, and federal EPA 608 for refrigerants. Many out-of-state contractors expect one license and miss the gas fitter requirement.

Skipping EPA 608

EPA Section 608 is federal and required before touching any refrigerant. It is independent of the state credential.

Performing gas work without a Gas Fitter license

Connecting a furnace gas line or servicing a gas water heater without a Gas Fitter credential is a violation of RSA 153 and exposes the contractor to discipline and civil liability.

Missing continuing education

IFGC and NFPA 54 continuing education is mandatory for renewal. Missing it blocks renewal.

Letting the master license lapse mid-project

A lapsed master gas fitter license invalidates permits and supervision. Renew on time and confirm via the OPLC license lookup.

Other New Hampshire Trade Licenses

CLR covers other New Hampshire trades as well — the published guides below may be more relevant:

Frequently Asked Questions

Does New Hampshire have a state HVAC contractor license?

No. New Hampshire does not issue a standalone state HVAC license. Air-side mechanical work is regulated through municipal permitting under the State Building Code. Fuel gas work requires a Gas Fitter credential from the Mechanical Licensing Board.

When do I need a New Hampshire Gas Fitter license?

Any work involving fuel gas piping, gas-fired appliance connection, or gas appliance servicing requires a Gas Fitter credential under RSA 153. This is enforced statewide regardless of the municipality.

Is EPA Section 608 required in New Hampshire?

Yes. Federal Section 608 certification is required for any work involving refrigerants regardless of state license status.

Who licenses gas fitters in New Hampshire?

The New Hampshire Mechanical Licensing Board, administered by the Office of Professional Licensure and Certification (OPLC) under RSA 153, licenses all gas fitters statewide.

How often does the New Hampshire Gas Fitter license renew?

On a two-year cycle set by the Mechanical Licensing Board, with continuing education in the IFGC and NFPA 54 as required by board rules. Confirm current rules before renewal.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-04-11 · Next scheduled review 2026-07-10