How to Become a Plumber in the US: A 4-Year Roadmap From Helper to Journeyman License
8 min read ยท 2026-10-15
How to become a plumber in the US comes down to four steps. You finish high school or a GED, get into a plumbing apprenticeship, log the work hours and classroom hours your state requires, and pass the journeyman licensing exam. How long it takes depends on your state's required hours. This roadmap uses about four years as a planning example, so check your own state's numbers before you plan.
This guide follows the US system. If you live in another country, the steps will look similar, but the training, licenses and rules are different, so check with your national or regional trade authority first.
Your state or city licensing board sets the rules. It decides how many hours you need, which exam you take and which plumbing code you study. Some states license apprentices, some only license journeymen and masters, and some leave licensing to cities. Start by finding your board's page and keep it open. Every phase below points back to it.
The roadmap at a glance
Goal: Earn a journeyman plumber license and be able to work without direct supervision. Duration: About 4 years as a planning example, depending on your state's hour requirements
Get Ready (Months 1-3)
Meet the entry rules and show up to interviews already useful.
- Get your high school diploma or GED if you don't have one yet, and keep a copy ready to send.
- Brush up on fractions, basic algebra and measuring, since you'll use them for pipe lengths, slope and offsets.
- Get a valid driver's license and a clean driving record if you can, because many shops send apprentices out in work vans.
- Find your state or city plumbing board's page and write down its apprentice rules, hour totals and exam name.
- Buy basic safety gear: work boots, safety glasses and gloves.
Milestone: You have your diploma or GED, a driver's license and a written list of your state's licensing requirements.
Land an Apprenticeship (Months 3-6)
Start getting paid to learn under a licensed plumber.
- Apply to union programs (often run through a local of the United Association) and to non-union programs run by contractor associations.
- Contact local plumbing companies directly and ask if they hire helpers or apprentices.
- Look into a short pre-apprenticeship or trade school course if your applications get no replies.
- Register as an apprentice with your state if it requires it, before your hours start counting.
Milestone: You have a signed apprenticeship or a helper job with a licensed plumber, and your hours are officially being tracked.
First Year on the Job (Months 6-18)
Learn the tools, the safety rules and the basic tasks.
- Learn to cut, join and support copper, PEX, PVC and cast iron pipe.
- Take your OSHA safety training if your program offers or requires it.
- Attend every classroom session and keep your attendance records.
- Keep a simple daily log of the jobs you did and the skills you practiced.
Milestone: You can rough in a simple drain line and a water supply line while your supervisor checks your work.
Build Hours and Range (Months 18-36)
Work on as many kinds of jobs as you can.
- Ask to rotate between service calls, new construction and remodels.
- Learn drain, waste and vent systems, water heaters and gas piping where your license covers it.
- Read blueprints and isometric drawings until you can lay out a bathroom group yourself.
- Check your logged hours against the state total every three months.
Milestone: You can do a full residential rough-in and pass inspection with little help.
Prepare for the Exam (Months 36-45)
Turn your field experience into a pass on the licensing exam.
- Get the exact code book your exam uses, for example the International Plumbing Code or the Uniform Plumbing Code, in the edition your state names.
- Tab and highlight the code book if your exam is open book, and practice finding answers fast.
- Take timed practice tests every week and study the chapters where you miss the most questions.
- Practice the hands-on part if your state includes one.
Milestone: You score well above the pass mark on two full timed practice tests in a row.
Apply, Test and Get Licensed (Months 45-48)
Submit a clean application and pass on the first try.
- Collect your hour records, classroom certificates and supervisor signatures.
- Submit your application and fee to the board and book your exam date.
- Take the exam, then apply for your license card once you pass.
Milestone: You hold a journeyman plumber license.
What a Plumbing Apprenticeship Looks Like Day to Day
An apprenticeship is a job, not a class. You work full time for a plumbing contractor, under a licensed journeyman or master plumber, and you get paid while you learn. You also go to classroom training, usually in the evenings or in blocks, where you study code, safety, math and blueprint reading.
Expect the first months to be physical and simple. You'll carry material, dig trenches, clean job sites and hand tools to your journeyman. That isn't wasted time. Watching how an experienced plumber plans a job teaches you more than any textbook. Ask questions at the right moment, usually during breaks or the drive between jobs, not in the middle of a tricky repair.
The best apprentices keep good records. A notebook or phone notes with the date, job type and what you did will help you in three ways:
- It proves your hours if your paperwork gets lost.
- It shows you which skills you haven't practiced yet.
- It gives you real examples to talk about when you ask for a raise or apply for your license.
Union, Non-Union or Trade School First
There are three common ways in, and they can be combined. Union apprenticeships are run jointly by unions and employers. They usually have a set application period, an aptitude test and an interview, and they place you with contractors. Non-union apprenticeships are often run by contractor associations or directly by a company that hires you and registers you as an apprentice.
Whether trade school is required depends on your state, so check with your board. In many states the apprenticeship is the main path, and trade school is an option that can help if you have no contacts in the trade. A short program teaches safety, tools and basic code, so you show up to interviews able to talk about the work. Some schools also have links with local contractors. The risk is paying for school and then still having to start the apprenticeship from the beginning, so ask the school whether its hours count toward your state's total.
How to choose:
- Pick a union program if one near you is accepting applications and you're happy to wait for the next intake.
- Pick a non-union shop if you want to start working as soon as possible.
- Pick a trade school first only if your applications keep getting turned down or you want structure before you start.
How to Study for the Journeyman Plumber Exam
Journeyman exams usually test the plumbing code your state uses, plus practical knowledge like sizing pipes, venting rules and fixture units. Many are open book, which sounds easy but isn't. The time limit is tight, and people who don't know their way around the code book run out of time.
Start your exam prep about a year before you expect to qualify. That gives you time to study a little each week instead of cramming. A simple weekly rhythm works well, as shown below.
Use your job as a study tool. When you install a vent or a cleanout, look up the code section that covers it that evening. Linking code rules to work you did with your own hands makes them much easier to remember on exam day.
- Two short evenings reading one chapter of the code and summarizing it in your own words.
- One timed practice test at the weekend.
- One review session on the questions you got wrong, finding the exact code section for each.
After the Journeyman License
A journeyman license lets you work without someone watching over your shoulder, but it isn't the last step. Many plumbers keep going and specialize in service and repair, new construction, commercial work, medical gas or backflow testing. Each one has its own training and sometimes its own certificate.
The next license level is master plumber. Many states ask for more work experience as a journeyman and another exam that covers more complex systems and business rules. Your board's page lists the exact requirements. A master license is usually what you need to pull permits in your own name or run your own plumbing company. If that's your long-term goal, start keeping records of your journeyman hours from the first day, just like you did as an apprentice.
Common mistakes to avoid
- Starting work before you register as an apprentice. Those hours may not count, so check your state's rules and register first.
- Trusting your employer to track your hours. This can leave gaps at application time, so keep your own log and get it signed regularly.
- Doing only one kind of job for years. This leaves holes in your skills and your exam knowledge, so ask to rotate between service, new builds and remodels.
- Studying the wrong code book or edition. This wastes months, so confirm the exact code and edition with your board before you buy anything.
- Waiting until your hours are complete to start exam prep. This delays your license, so begin studying about a year early.
- Skipping safety gear on short jobs, which is when many injuries happen. Wear your glasses and gloves every time.
Frequently asked questions
How long does it take to become a plumber?
The length depends on your state's required hours and how steadily you work. This roadmap assumes about four years as a planning example. Read your state board's rules first, then adjust the phases to match its hour totals.
Do you need to go to trade school to become a plumber?
In many states, no. Check your board. The apprenticeship and the classroom hours that come with it are often the main path. Trade school can help you get hired if you have no experience, but check that its hours count toward your license.
Can you become a plumber with no experience?
Yes. Many plumbers start as helpers or first-year apprentices with no plumbing background at all. At the start, showing up on time, being physically ready for the work and knowing basic math matter more than past experience.
Do these steps apply outside the US?
Not exactly. This roadmap follows the US model of apprenticeship, state licensing and journeyman exams. Other countries train and license plumbers in their own ways, so check with your national or regional trade authority before you plan.
What is the difference between a journeyman and a master plumber?
A journeyman plumber is licensed to work on their own, without direct supervision. A master plumber has more experience and has passed a further exam. In many states, that's what you need to pull permits, supervise apprentices and run a plumbing business.