The timeline depends on your state and whether you start as an apprentice or journeyman
Most states require between four and five years of on-the-job training before you can sit for a journeyman plumber exam. That clock starts when you register as an apprentice with your state's plumbing board or a local trade union. The exact length varies: some states count 8,000 hours of work (roughly four years full-time), others require 10,000 hours (five years), and a few accept two years if you already hold a related license like gas fitter or HVAC technician.
After you complete the required hours and classroom instruction, you then take a written exam. Most states give you the exam results within two to four weeks. Once you pass, you can explore for your journeyman license, which typically arrives by mail within one to two weeks. The entire process from apprentice registration to holding a journeyman card usually takes four to six years.
If you want to become a master plumber — which lets you run your own business and supervise apprentices — add another two to five years of journeyman experience on top of that, plus another exam. Some states let you skip straight to master if you have a four-year degree in plumbing or engineering, but this is rare.
Key Takeaways
- Apprenticeship takes four to five years depending on your state, measured in work hours (8,000 to 10,000) plus classroom time.
- You must register with your state's plumbing board or a local union before your hours count toward licensure.
- The journeyman exam takes two to four weeks to score, and your license arrives one to two weeks after you pass.
- Master plumber status requires two to five additional years as a journeyman, plus a separate exam and process.
- Some states accept related licenses (HVAC, gas fitter) as credit toward apprenticeship hours, shortening the total time.
How apprenticeship hours are tracked and what counts
Your state's plumbing board or your union local keeps the official record of your hours. You cannot straightforward work for a plumber and count the time yourself — your employer must report your hours to the board, usually quarterly or annually. If you work for a non-union shop, the board tracks you directly. If you join a union apprenticeship program, the union reports on your behalf.
Not all plumbing work counts equally. Most states require a mix: some hours must be spent on residential plumbing, some on commercial, some on service calls, and some on new construction. A few states also require a minimum number of hours on specific tasks like water heater installation or backflow prevention. Your apprenticeship coordinator or union steward can tell you which hours count and which do not.
If you change employers or take time off, the clock does not reset — only the hours you actually worked count. If you stop working as a plumber for more than a year or two, some states may require you to repeat part of your apprenticeship or take a refresher course before sitting for the exam. Check your state's rules before taking a long break.
Classroom and exam requirements that run parallel to work hours
While you are working your apprenticeship hours, you must also complete classroom instruction. Most states require 400 to 600 hours of classroom time spread across your apprenticeship — roughly 100 to 150 hours per year. This is usually taught at a community college, trade school, or union training center, often in evening or weekend classes so you can work during the day.
The classroom covers plumbing code, blueprint reading, math, safety, and the theory behind the work you are doing on the job. You typically need to pass each year's classes to stay in good standing, and some states require a minimum grade (often 70 percent). If you fail a class, you usually retake it the next time it is offered, which can delay your progress by a year.
Once you have completed all your hours and classroom work, you sit for the journeyman exam. This is a written test administered by your state's plumbing board or a testing company they contract with. The exam covers plumbing code, safety, materials, and installation methods. Most states allow you to take it once you have logged your final hours, even if your classroom work is not quite finished — but you cannot receive your license until both are done.
State-by-state variation in length and requirements
California requires 10,000 hours (five years) plus 432 hours of classroom instruction. Texas requires 8,000 hours (four years) plus 600 hours of classroom work. Florida requires 10,000 hours but allows some credit for related experience. New York requires 10,000 hours but lets you count some classroom time as work hours, which can shorten the total calendar time slightly.
Some states have a faster track if you hold a related license. Colorado, for example, lets you count HVAC or gas fitter hours toward your plumbing apprenticeship, potentially cutting one to two years off the timeline. A few states also offer a "combination license" that covers plumbing, gas fitting, and heating in one credential, which can be faster than getting them separately.
Union apprenticeships sometimes move faster than non-union because union programs are structured and funded to move apprentices through on schedule. Non-union apprenticeships depend on your employer having enough work to keep you busy, so the timeline can stretch if work is slow. Check with your local plumbing board and any union locals in your area to understand your state's specific rules and what programs are available.
What happens after you pass the journeyman exam
Once you pass the journeyman exam, you submit your license process to your state's plumbing board along with proof of your hours, classroom completion, and exam score. The board reviews your paperwork — this usually takes one to two weeks. If everything is in order, they issue your journeyman license and mail it to you, which takes another week or two.
Your journeyman license lets you work as a plumber for someone else, but not run your own business or hire apprentices. You can now work without direct supervision on most jobs, though some states require a licensed master or journeyman to sign off on certain high-risk work like gas line installation or backflow prevention systems.
If you want to become a master plumber, you must work as a journeyman for a set number of years (usually two to five, depending on your state) and then pass a master exam. The master exam is harder than the journeyman exam and covers business law, estimating, and advanced code. After you pass, you can explore for your master license, which follows the same review and mailing process as the journeyman license.
How to speed up or slow down the timeline
You can shorten your apprenticeship if you already hold a related license. If you are a licensed HVAC technician, electrician, or gas fitter, some states will credit you with one to two years of plumbing hours. You still have to complete the plumbing-specific classroom work and pass the plumbing exam, but you skip part of the on-the-job time.
Working full-time as an apprentice is the fastest route. If you work part-time, your hours accumulate more slowly, and your apprenticeship will take longer. Some apprentices work full-time for a few years, then switch to part-time or seasonal work, which extends the timeline by months or years.
Classroom delays can also slow you down. If you fail a class or miss enrollment in a required course, you may have to wait until the next school year to retake it. Some trade schools offer accelerated or online classroom options that let you move faster, but not all states accept online instruction for plumbing apprenticeship.
Renewal and continuing education after you get your license
Once you hold a journeyman or master license, you must renew it periodically — usually every one to three years, depending on your state. Renewal involves paying a fee (typically $50 to $300) and sometimes completing continuing education hours. Most states require 8 to 24 hours of continuing education per renewal cycle, covering new code changes, safety updates, or specialized topics.
Continuing education is usually offered by trade schools, unions, or online providers. Many states allow you to count work-related training or conferences toward your hours. If you let your license lapse by not renewing on time, you may have to retake the exam or complete additional training before you can work again.
Frequently Asked Questions
Can I count hours from a plumbing job before I registered as an apprentice?
No. Your hours only count from the date you officially register with your state's plumbing board or union. Work you did before registration does not count toward your apprenticeship, even if you were doing plumbing tasks. This is why registering early matters — it starts your clock.
What if I fail the journeyman exam?
You can retake it. Most states let you try again within a few months, though some require you to wait 30 to 90 days between attempts. You do not have to repeat your hours or classroom work — only the exam. However, if you fail multiple times, some states may require you to take a refresher course before your next attempt.
Do I have to join a union to become a plumber?
No. You can apprentice through a non-union shop and register directly with your state's plumbing board. Union apprenticeships are often structured and may move faster, but they are not required. Both paths lead to the same journeyman and master licenses.
Can I work as a plumber while I am still an apprentice?
Yes, that is the whole point of an apprenticeship — you learn by working. As an apprentice, you work under the supervision of a journeyman or master plumber. You cannot run your own jobs or work unsupervised until you pass your journeyman exam and get your license.
How much does it cost to get a plumbing license?
Costs vary widely. Union apprenticeships are often free or low-cost because the union funds training. Non-union apprenticeships may charge tuition for classroom instruction, typically $1,000 to $3,000 per year. Exam fees are usually $100 to $300, and your first license process fee is typically $50 to $200. Budget $5,000 to $15,000 total over four to five years if you go non-union.