You get a gas fitter license from the government that regulates gas fitting where you work — usually the state, sometimes the city.
Fourteen jurisdictions our research verified issue standalone gas-fitter credentials; elsewhere the work falls under the plumbing or mechanical license.
In most states the route rhymes — start at the apprentice level, log supervised hours, pass the board's exam — but each board sets its own shape.
Here is the map, the ladder and the test.
Which states license gas fitters separately
There is no single national gas fitter license — the credential is set jurisdiction by jurisdiction.
In fourteen of them, on the list our research verified, gas fitting is a trade of its own with its own license, separate from the plumber's.
Here is the map.
| Jurisdiction | The standalone gas-fitter credential |
|---|---|
| Alabama | Gas fitter licenses through the Alabama Plumbers and Gas Fitters Examining Board, at apprentice, journeyman and master levels |
| Alaska | Plumber Gas (PG) certificate of fitness |
| Arkansas | Restricted gas fitter licenses — Gas Fitter Trainee, Gas Fitter, Gas Fitter Supervisor |
| District of Columbia | Gasfitter license, or a combined plumber/gasfitter license, through the Board of Industrial Trades |
| Louisiana | Natural Gas Fitter license through the State Plumbing Board of Louisiana |
| Maine | Propane and Natural Gas Technician license through the Fuel Board |
| Maryland | Natural Gas Fitter licenses at apprentice, journey and master levels, plus a Propane Gas Fitter certification |
| Massachusetts | Gas fitter licenses through the Board of State Examiners of Plumbers and Gas Fitters |
| New Hampshire | Five fuel gas fitter specialties plus a trainee credential |
| New Mexico | JG journeyman natural gas fitter certificate |
| North Carolina | Fuel Piping contractor and Fuel Piping Technician licenses |
| Utah | Certified Natural Gas Technician certification |
| Vermont | Natural Gas Installer and LP Gas Installer certifications |
| Virginia | Gas fitter tradesman designations — journeyman gas fitter, master gas fitter, LP gas fitter, natural gas fitter provider |
Two things about the table.
First, the names are the states' own — license, certificate of fitness, certification — and the last section untangles the labels.
Second, the list is what our research verified, not a census: boards add and retire credential types, so confirm yours with the board before you plan around it.
New Mexico sits halfway between this section and the next.
Its JG journeyman natural gas fitter certificate is a standalone credential, but it works under an MM-2 or MM-98 contractor license — and the MM-2 (natural gas fitting) covers natural gas piping, warm-air heating and gas appliances, but may not install LP gas systems.
New Mexico's rules were under amendment in 2026, so check the current rules with the CID before you apply.
A state missing from the table is not a state where gas work goes unlicensed.
In some of the others, gas fitting sits inside the plumbing or mechanical license — the next section shows how that looks.
In others still, licensing is local.
Texas is its own case: it has no standalone gas-fitter license on this list, and its LP-gas (propane) work runs through the Railroad Commission, not its licensing departments.
Still deciding on the trade itself?
Our gas fitter career guide covers the job, the pay and the entry routes first.
Rules change — confirm with your board
Where gas is part of the plumbing or mechanical license
Where there is no standalone credential, gas is often folded into a neighboring license.
Four patterns showed up in our research.
Gas as plumbing.
In New York City, gas piping for HVAC equipment is plumbing work: it falls under the Licensed Master Plumber, and the workers doing that gas work need a DOB Gas Work Qualification.
The qualification's routes are in the last section.
Gas inside the plumbing license.
North Carolina sits on both lists: it issues standalone Fuel Piping (FP) licenses, and it also builds fuel piping privileges into its Plumbing and Heating Group 1, 2 and 3 licenses, with no separate exam for people who hold one of those.
Where gas rides on the plumbing license, the plumbing license requirements are what decide who may do the work.
Gas inside the mechanical license.
Oklahoma's mechanical licensing categories include natural gas piping as its own category, alongside HVAC limited or unlimited, process piping, refrigeration, sheet metal and the rest.
Idaho structures gas piping under the HVAC trade: four HVAC classifications — apprentice, journeyman, HVAC contractor and HVAC specialty contractor — plus specialty apprentice and specialty journeyman classifications for areas such as gas piping and hearth appliances.
Gas in contractor licensing law.
Nevada approaches gas through its contractor licensing law (NRS/NAC 624).
Our research found no separate gas-fitter license for workers in that law; permanent gas supply falls within the C-1d plumbing contractor subclassification.
That is a finding about worker licensing under 624, not a clearance for all gas work — Nevada also has an LP-gas board our research did not cover, so propane work there is a separate question for the state.
The bundling question reaches HVAC techs directly.
In five states — New Hampshire, Utah, Vermont, Maine and Massachusetts — an HVAC tech who works on gas-fired equipment needs a separate state gas credential: the fuel gas fitter in New Hampshire, the Certified Natural Gas Technician in Utah, gas installer certification in Vermont, the propane and natural gas technician license in Maine, and the gas fitter license in Massachusetts.
New York City runs the other direction: gas piping there is plumbing, so the credential sits on the plumbing side of the house.
If you hold an HVAC license and want to take gas work, your state board — not this page — can tell you which credential covers it where you work.
License levels and exam
Most gas-fitter credentials level up like the other pipe trades: start supervised, log hours, test for the next grade.
The ladder's shape repeats even where the names and the totals differ.
The three-rung ladder.
Alabama, Maryland, Massachusetts and the District of Columbia all structure their gas credentials as apprentice, journeyman and master — in DC as a gasfitter license or a combined plumber/gasfitter.
Maryland requires apprentices to be at least 16.
Other shapes.
Arkansas names its restricted licenses Gas Fitter Trainee, Gas Fitter and Gas Fitter Supervisor — $25 for the trainee, $75 application plus $75 for the gas fitter license, and $125/$200 for the supervisor — all expiring June 30.
New Hampshire splits the trade into five fuel gas fitter specialties — hearth system installation and service, domestic appliance, fuel gas installation, fuel gas service and fuel gas piping installation — plus a trainee.
Virginia's designations run journeyman gas fitter, master gas fitter, LP gas fitter and natural gas fitter provider.
The hours.
Alaska's Plumber Gas certificate of fitness takes 4,000 hours in the trade, of which at least 2,000 must be in the installation of fuel gas piping, logged while holding a Trainee COF.
Louisiana's Natural Gas Fitter needs 3,000 hours of gas-fitting work on an indentured program, or 4,000 hours without one.
Maryland's journey natural gas fitter requires 3,750 hours as an apprentice natural gas fitter over at least two years.
North Carolina's Fuel Piping Technician licenses take 1,500 hours over 9 months, and its FP contractor license 2,000 hours over one year.
The exam.
Each board tests its own.
In Louisiana, for example, the Natural Gas Fitter exam is a one-part, 80-question written test on the 2021 International Fuel Gas Code, three hours long, plus a 30-minute practical.
Maine requires applicants to complete a board-approved training program before they can sit its propane and natural gas technician exam, and licenses helpers at $20 with no exam — but helpers must be directly supervised on site.
Maryland's Propane Gas Fitter certification builds on NPGA Distribution Systems Operations training or an equivalent.
North Carolina's Fuel Piping contractor applicants face a 2-hour exam plus a business and law exam.
Moving up.
A Louisiana Master Natural Gas Fitter may employ apprentices and fitters.
Maryland lets HVACR masters qualify for its Master Natural Gas Fitter by exam with two years of gas-fitting experience.
Hours, fees and exam formats are board rules
Certifications vs licenses
Search results jumble the words — gas fitter license, gas fitter certification, gas fitter certificate, gas work qualification.
The states jumble them too.
What matters is not the noun but who issues the credential and whether the state requires it for the work.
A certification that works like a license.
Utah's credential is the Certified Natural Gas Technician — an individual certification covering the safe installation, modification, maintenance, cleaning, repair or replacement of gas piping, combustion air vents and exhaust venting systems, and altitude derating of gas appliances.
Doing that work in Utah requires it, HVAC workers included; a current Utah journeyman or residential journeyman plumber license counts as exemption documentation.
Vermont likewise requires everyone who inspects, installs or services propane or natural gas systems to hold a Division of Fire Safety certification — Natural Gas Installer, LP Gas Installer, or both.
Mandatory, examined, state-issued: called certifications, working as licenses.
A qualification attached to a license.
New York City splits the difference.
Gas piping there is plumbing work performed under a Master Plumber, and the individual worker carries a DOB Gas Work Qualification.
Full GWQ takes one of three routes: passing a DOB gas work exam while a registered journeyman plumber; completing a NYS-registered training program plus one year of NYC experience; or five years under a Master Plumber, one of them in New York City.
Limited GWQ takes six months of full-time plumbing work under a Licensed Master Plumber plus either a 16-hour DOB-approved gas course or enrollment in a NYS DOL-approved plumbing apprenticeship.
Propane is its own layer.
LP-gas (propane) is often licensed separately from natural gas fitting — in Texas, for example, the Railroad Commission regulates LP-gas work rather than the licensing departments, and each individual must pass an RRC exam for the activity they perform and must work for an RRC-licensed company.
Propane licensing is its own question; confirm the rules with your state licensing board before you take propane work.
What to do with this.
Find out which credential your state — or city — requires for the gas work you want to do, and who issues it.
This page tells you what to ask for; the board's applicant page is the authority for the current hours, exam and fees.
When the credential is in hand, browse gas fitter jobs on the job board built only for the two trades.
Career information, not legal advice. Licensing requirements above were verified in 2026 and change — confirm the current rules with your state licensing board, or the city or county where licensing is local, before you take gas work or apply.