You get a master plumber license by working the ladder below it: supervised apprentice first, then a licensed journeyman, then the experience stretch your state requires, then the master plumber exam.
In many states the license is also what lets a company pull permits and contract for plumbing work.
There is no national master plumber license — each state, and in some states each city, sets the requirements.
What a master plumber license allows
The master license is the top individual rung of the plumbing ladder, and its powers are the ones the rungs below do not carry: planning, permitting, supervising and qualifying a business.
As of September 29, 2026, 24 states run the classic apprentice/trainee → journeyman → master ladder at the state level.
Texas is one of them — the Texas State Board of Plumbing Examiners (TSBPE) licenses plumbers statewide with four credentials: Tradesman Plumber-Limited, Journeyman Plumber, Master Plumber and Plumbing Inspector.
The clearest way to see what the rung is worth is a state that reserves its powers by law.
In Montana, only a licensed master plumber may plan, estimate, bid, contract for and supervise plumbing work, and only masters may pull plumbing permits.
Delaware goes further still: only a licensed master plumber may provide plumbing services at all, with apprentices and journeymen working unlicensed under a master who employs them or works full time for the same business.
The second power is qualifying a company to do plumbing.
Texas requires any business that advertises or offers plumbing to secure the services of a Responsible Master Plumber, and a Georgia company may do plumbing only when a Master Plumber Class I or II is regularly connected with the business full-time.
Where the master license attaches to a business like that, it is the door to running your own shop or anchoring someone else's — the career side of the rung is covered in our master plumber career guide.
Experience after journeyman
Between the journeyman license and the master exam sits a state-set stretch of experience — usually years of work while holding the journeyman license, sometimes with a supervision requirement folded in.
The states write that stretch differently:
- Texas: master exam applicants must have held a journeyman license — Texas's or another state's — for at least 2 years, or 1 year plus completion of a U.S. Department of Labor Office of Apprenticeship program.
- Montana: 4 years as a licensed journeyman, with 3 of those years — which may run concurrently — working with a licensed master plumber or in a supervisory capacity; one year means 1,500+ hours in a continuous 12-month period.
- Arkansas: 5 years of experience for the master plumber exam, and a journeyman must hold that license one full year before sitting the master exam.
What counts toward the requirement — which work, which supervisors, which documentation — is board-specific, so ask your board what it credits before you start counting the years.
The rungs below this one are covered in our plumbing license requirements guide.
Experience rules are board rules
The master plumber exam
The exam is where the license is earned, and it leans on the plumbing code your state has adopted.
New Jersey's master plumber exam has three parts: a written exam on the National Standard Plumbing Code as adopted by New Jersey, a practical exam, and a written laws-and-regulations exam — run by a third-party vendor.
New York City's master plumber written exam is multiple-choice on the NYC Construction Codes, rules and regulations, closed-book with no reference materials, with a 70% passing score and a $585 fee.
A hands-on practical is the exception, not the rule — but where it exists, it is real.
The states where the research found one span Texas, Kentucky, Louisiana, Michigan, New Mexico and Utah; New Jersey's master exam carries a practical part alongside its written papers; Montana's practical works from diagrams rather than hands-on assembly; and New York City and Omaha run practicals under their local licenses.
New York City's practical carries a $530 fee and must be passed within 24 months of the written-exam notification.
In Texas, TSBPE's written exams are delivered through Pearson VUE.
Prepare from your board's own candidate handbook: the code edition, the reference rules, the vendor and the fees are all board decisions, and they change.
Master plumber license vs. plumbing contractor license
The master license is an individual trade license; a plumbing contractor license is the authorization to run a plumbing business.
In much of the country they are one and the same: in Georgia, Maine, Kentucky, Delaware, Montana, Wisconsin, Texas, Louisiana, New Jersey, North Dakota, Connecticut and Rhode Island, the individual master (or equivalent) license is what lets a business contract — there is no separate state plumbing-contractor license.
The same holds in New York City and under Nebraska's city master licenses.
Maine is the plainest version: the Master Plumber license is the license to engage in the business of installing plumbing.
The mechanics differ in ways that matter if you plan to qualify a company.
Louisiana lets a master designate no more than one employing entity at a time.
North Dakota requires a licensed master plumber in charge of the work at all times — though in cities under 1,000 people and rural areas a licensed journeyman may run the business.
Kentucky businesses operate under an active master plumber license and must carry at least $250,000 in general liability insurance.
Wisconsin licenses individuals only, never firms, and plumbing may be installed only with a licensed master plumber in charge.
Elsewhere the layers are separate.
Utah's plumbing contractor classes require the Utah Business and Law exam plus a master plumber classification.
Connecticut tops its ladder with the individual P-1 Unlimited Plumbing Contractor rather than a "master", and Idaho, Indiana, Oklahoma and South Dakota also end their ladders at a contractor license instead of a master.
Ohio has no individual plumber license at all — the state licenses plumbing contractors, the businesses, only.
And in Maryland, Arkansas and Vermont the master license appears to double as the business license too, but the research could not confirm it — treat those three as questions for the state board.
For how contractors are licensed, bonded and insured from the employer's side, see our plumbing contractor license by state guide.
How long it takes to get a master plumber license
Add the stages up and the honest answer is: there is no single timeline, because the stages themselves are not national.
In the classic-ladder states, the climb is apprentice, then journeyman, then the master exam.
Arkansas's rule makes the shape concrete: 4 years of experience for the journeyman exam, 5 for the master exam, and a journeyman must hold the license one full year before the master exam.
Texas asks for 2 years holding the journeyman license — or 1 year plus a Department of Labor Office of Apprenticeship program — and Montana asks for 4 years as a licensed journeyman.
In a large share of the country, though, the top rung looks nothing like this.
Four states have a journeyman-level license but no state master license at all: Alaska, New Mexico, Oregon and Washington.
Seven license plumbers locally — Florida, Kansas, Missouri, Nebraska, Nevada, New York and Wyoming — where cities, counties or an industry board run the ladder.
Nebraska is the sharpest local version: state law requires anyone installing or repairing sanitary plumbing to be a master plumber licensed by the city or village nearest the job site, with contracting done under city licenses such as Omaha's Master Plumber and Lincoln's Master Plumber Contractor.
Some states skip rungs entirely.
Delaware, Illinois, New Jersey and North Carolina have no journeyman license: Delaware licenses only masters, Illinois's two levels are the licensed apprentice plumber and the licensed plumber, and New Jersey registers journeymen while examining and licensing only masters.
Tennessee appears to have only a limited state plumber credential, with journeyman and master tiers handled locally, and Pennsylvania appears to license locally too — neither is confirmed.
Arizona, California, Mississippi and South Carolina appear to license plumbing contractors only, also unconfirmed.
The practical version of "how long": apprentice years plus journeyman years plus exam scheduling, counted by your board's own definitions.
Ask your board — or your city licensing office — how your hours map to the requirement before you plan a date.
And when the license lands, plumber jobs that put it to work are listed on our board.
Career information, not legal advice. Licensing requirements change; confirm the current master plumber requirements with your state licensing board — or the city or county office where licensing is local — before you apply for an exam or bid work.