To become a licensed plumber, you usually register as an apprentice, complete a 4 to 5 year apprenticeship that combines paid work with classroom training, pass your state's journeyman exam, and later, with more experience, take the master exam. The exact hours, exams and license names are set by your state or city, so your state plumbing board is the final word.
The BLS Occupational Outlook Handbook page on plumbers, pipefitters and steamfitters, checked as of October 2026, describes the typical apprenticeship as 4 to 5 years, with about 2,000 hours of paid on-the-job training each year plus technical instruction. It also notes that most states and some localities require plumbers to be licensed, usually after 2 to 5 years of experience and an exam.
This page explains the usual path. It doesn't replace your board's rules, which change, and which this page won't try to list state by state.
Why plumbing is licensed so tightly
Plumbing carries drinking water and sewage, and gas piping in many jurisdictions. A bad cross-connection can contaminate a water supply. That public health risk is why states license plumbers more consistently than many other trades, and why permits and inspections are routine.
The usual three steps
1. Apprentice
You start by getting hired by a plumbing contractor or accepted into an apprenticeship program (union or non-union), and in many states you register as an apprentice with the board. You work under licensed plumbers, log your hours and go to classes on code, drawings, pipe systems and safety.
The BLS says that 4 to 5 years at roughly 2,000 hours a year is typical. That's 8,000 to 10,000 hours of field time by the end, plus classroom hours. Your own state might count differently, so ask your board exactly what it accepts and how you document it.
The U.S. Department of Labor's Apprenticeship Finder lists registered apprenticeship openings by trade and location.
2. Journeyman (or journey-level)
After the apprenticeship, you apply to take the journeyman exam. It typically covers your state's plumbing code and practical knowledge. A journeyman can do the work without direct supervision but often can't pull permits or contract with the public alone.
3. Master
A master license usually requires more years as a journeyman and another, harder exam. The BLS notes that some states require a master plumber license to get a contractor license. In those states, the master is the person who can run a business, pull permits and take responsibility for other plumbers' work.
Some states have extra tiers. The Texas State Board of Plumbing Examiners, for example, lists apprentice registration, tradesman plumber-limited, journeyman, master and responsible master plumber among its license types, as of October 2026. Other states use different names. That's the reason to read your own board's pages rather than a generic list.
| Step | What you can usually do | How you usually get there |
|---|---|---|
| Apprentice | Work under a licensed plumber | Hired or accepted into a program, registered with the state |
| Journeyman | Work without direct supervision | Apprenticeship hours plus an exam |
| Master | Pull permits, supervise, often contract | Years as a journeyman plus an exam |
How to find your state's rules
- Search for your state plumbing board. In some states it's a dedicated plumbing board; in others plumbing sits under a contractor licensing board or a department of labor or health.
- Check your city and county. Some cities license plumbers separately from the state.
- Ask four questions. How many hours for each level? Do classroom hours count, and which schools? What's on the exam and how is it scheduled? Does my out-of-state license transfer (reciprocity)?
- Keep your own records. Log hours, employers and supervisors as you go. Reconstructing five years of hours for an application is painful.
Renewals and continuing education
Many states require license renewal and some require continuing education to keep the license active. Track your renewal date. Working on a lapsed license can carry penalties, and contractors who check credentials before sending work won't offer it to you.
What licensing does to your pay
Each step changes what you can legally do on your own, which is why pay tends to rise at each one. The full BLS pay range is in how much plumbers make. The plumbing industry page shows how service plumbing companies run their day, which is where many journeymen work.
Going out on your own
A master license is often the step before starting your own shop. Before you do, read how to start a field service business and 1099 vs W-2 for technicians, because insurance, permits, taxes and getting paid all become your job.
What to take away
- The usual path is apprentice, journeyman, master. Names and hours vary by state.
- The BLS describes a 4 to 5 year apprenticeship with about 2,000 paid hours a year plus classroom work.
- Most states and some cities license plumbers. Your state board is the authority.
- Log your hours as you go, and track renewals and continuing education.
Common questions
How long does it take to become a licensed plumber?
The BLS describes apprenticeships as typically 4 to 5 years, and most states require 2 to 5 years of experience before a license exam. A master license takes longer. Your state board sets the exact numbers.
Can I get a plumbing license without an apprenticeship?
Some states accept documented work experience under a licensed plumber in place of a formal apprenticeship program, and some give credit for trade school. Ask your board what experience it accepts and how it must be documented.
Does a plumbing license transfer to another state?
Sometimes. Some states have reciprocity agreements, and others require you to take their exam. Check with the board in the state you're moving to before you go.
What's the difference between a journeyman and a master plumber?
A journeyman can work without direct supervision. A master has more experience, has passed a harder exam and, in many states, can pull permits, supervise others and hold or qualify a contractor license.