Getting a plumbing license means climbing a ladder: you work documented hours as an apprentice under a licensed plumber, sit for a journeyman exam, then test for a master license after more supervised experience. If you also want to run your own company and pull permits in your own name, that is a separate contractor license on top of the trade license, with its own application.
Plumbing is one of the most consistently licensed trades in the country, and the details vary by state: the hour counts, the exam content, the fees, and whether your license travels across a state line are all decided by your state licensing board. This page explains how the process generally works so the official rules make sense when you read them. For the actual requirements where you live, check your state's official requirements.
What are the steps to get a plumbing license?
- 1Enroll as an apprentice, through a union local, a trade school program, or a licensed plumbing company that registers you with the state
- 2Work documented, supervised hours under a licensed plumber, usually alongside classroom instruction
- 3Apply to your state board with proof of those hours, then sit for the journeyman exam
- 4Work as a licensed journeyman while you build the additional experience your state requires
- 5Test for the master plumber license, the level that in most states can supervise apprentices and qualify a company
- 6If you want your own shop, apply separately for the contractor or business license your state requires
The word documented matters. Boards do not take your word for the time you spent under a master plumber. They want signed experience affidavits from the plumbers who supervised you, pay stubs, or an apprenticeship transcript, and they check. Chasing down a supervisor who moved away years ago is the single most common thing that delays an application.
An apprenticeship is a paid job, not a classroom exercise. From the first week you are cutting and joining pipe, setting fixtures, running drain lines, and learning the plumbing code from someone whose license is on the line when you get it wrong. Keep your own log of hours and tasks from day one, in your own notebook or phone, so your application never depends on someone else's paperwork.
What is the difference between an apprentice, a journeyman, and a master plumber?
An apprentice may only work under supervision. A journeyman is licensed to do plumbing work on their own, but in most states cannot pull permits for their own jobs or put their name on a company. A master plumber has passed the highest trade exam and is, in most states, the license that can supervise apprentices, qualify a business, and answer to the inspector. A few states use different names or fold the levels together, but the shape repeats almost everywhere: supervised hours, then an exam, then more experience, then a higher exam.
How long each rung takes is a state decision. Do not trust a figure from a forum or a school's advertisement; the only numbers that count are the ones your board publishes today.
What is a trade license versus a contractor license?
A trade license says you may do the work. A contractor license, which in some states is a plumbing contractor license and in others a business registration plus a bond, says you may sell the work: sign contracts with customers, pull permits in your own name, hire and supervise other plumbers, and stand behind the job legally.
| Trade license (journeyman or master) | Contractor license | |
|---|---|---|
| What it proves | You know the code and the craft | Your company may lawfully sell plumbing work |
| Who holds it | The individual plumber | The business, qualified by a licensed plumber |
| Typical requirements | Documented hours plus an exam | A qualifying master plumber, insurance, often a bond |
| What it lets you do | Work on the tools | Sign contracts, pull permits in your name, hire plumbers |
This split is why a licensed plumber going out on their own still has paperwork left. Your master license makes you the qualifier, but the company itself needs its own registration, insurance, and whatever bond your state asks for before you can legally take a customer's deposit.
Once the licenses are sorted, the next document most new owners face is the plan itself. Our plumbing business plan guide walks through what belongs in each section and why a lender asks for it.
Does a plumbing license transfer to another state?
Sometimes, and only the two boards involved can tell you. Some states have reciprocity agreements that let a journeyman or master license carry over with little more than an application. Others make you re-test no matter how long you have held a license. Reciprocity lists change, and they are often one-directional, so before you move or bid work across a state line, call the board in the new state and ask exactly what they will accept.
What happens if you do plumbing work without a license?
Unlicensed plumbing work is treated more seriously than in most trades because the pipes carry drinking water and gas. Depending on the state, consequences range from fines to criminal charges, and the practical fallout hurts just as much: a customer often has no obligation to pay for unlicensed work, an inspector can order it torn out, insurance will not stand behind it, and permits get refused. If you are on the ladder, stay on it. Supervised work counts toward your hours; unlicensed side work can cost you the license you are working toward.
What comes after the license?
Most plumbers who go out on their own start as a one-truck service operation, because service and repair calls are what one licensed plumber with a stocked van can deliver on day one. That first stretch is also when being findable matters most. A homeowner with a leak searches Google, asks ChatGPT for a recommendation, scans the map results, and calls the company that looks real and picks up the phone.
Fast Digital Marketing's day-one kit exists for exactly that stretch. The AI Website is $297 per month with everything included: the website written and built for you, an AI receptionist that answers calls around the clock while you are under a house, online booking, and review requests sent automatically after each job. It is month-to-month, and you can cancel anytime (see pricing).
None of that installs a water heater or passes an exam for you, and no tool decides how the business goes; that part is on you. What it gives a newly licensed plumber is a better shot at getting found while the reviews and the reputation are still being built.
- ✓The ladder is apprentice, journeyman, master: documented hours, then an exam, at each rung
- ✓Hour counts, exam content, fees, and reciprocity vary by state; only your state board's published rules count
- ✓A trade license lets you do the work; a contractor license lets you sell it and pull permits in your own name
- ✓Keep your own log of supervised hours from the first day of your apprenticeship
- ✓Skip unlicensed side work; it can cost you the license you are working toward