How to Become a Plumber: Apprenticeship, License

Most plumbers learn the trade through an apprenticeship that typically lasts four to five years, earning a wage while working under licensed plumbers and taking classes in plumbing code, math and blueprint reading. Then you pass a journeyman exam where your state or city requires one, and later you can earn a master license and run your own business. A college degree is not required.

Service, construction and commercial: three different jobs

People picture a plumber fixing a leaky sink, but the trade has distinct paths:

Service and repair: going into homes and businesses to diagnose leaks, clogs, water heaters and sewer problems. You explain the problem, quote the fix and do the work while the customer watches. Emergency and on-call shifts are common.
New construction: installing water supply, drain, waste and vent piping in new buildings before walls close, then setting fixtures at the end. More predictable hours, more outdoor and site work.
Commercial and industrial: larger systems in hospitals, schools and factories, sometimes including gas lines, medical gas or backflow prevention.

Across all three, plumbers read plans, measure and cut pipe, solder, glue or crimp joints, and test systems for leaks. The work happens in crawlspaces, trenches, attics and basements, and yes, around sewage.

How plumbers train

Union apprenticeship: run by a plumbers’ union with local contractors, usually with an application, aptitude test and interview, and a set pay scale that rises each year.
Open-shop apprenticeship: sponsored by contractor associations or individual plumbing companies.
Helper first: some people start as a plumber’s helper and get enrolled in an apprenticeship by their employer.
Trade school or pre-apprenticeship: a short program covering basics, safety and tools, which can make you a stronger applicant and in some places counts toward required hours.

Apprentices are paid from day one, which is a big reason people compare plumbing favorably in our trade school vs college guide.

Licensing in general terms

Most states license plumbers, though in some places cities or counties handle it. A common ladder: register as an apprentice, log required hours, pass a journeyman exam on the plumbing code and practical knowledge, then after more experience pass a master exam. Running your own company usually requires a contractor license and insurance. States adopt different model plumbing codes, and hour requirements differ, so check your state licensing board before you start.

A step-by-step path from high school

Take algebra and geometry; plumbers calculate slope, pipe sizes and pressure.
Take shop or construction classes if your school has them.
Get a driver’s license; service plumbers drive between jobs all day.
Finish a diploma or equivalent, which most apprenticeships require.
Apply to several apprenticeships and plumbing companies, and prepare for any aptitude test.
Show up early, keep your hours documented and pass your classes.
Take the journeyman exam, then decide on service, construction, a specialty or a master license.

Try the trade for a summer

Take a summer job as a helper. Carrying pipe and digging trenches is part of year one.
Ride along on service calls to see the customer side.
Fix things at home: a running toilet or a slow drain. Notice if you enjoy figuring it out.
Hold an informational interview with a plumber about what the first two years are like.
Compare trades with our guide on how to choose a trade.

Who makes a good plumber

Plumbers who do well like solving physical puzzles, do not mind getting dirty, show up reliably and can talk calmly with a stressed homeowner. Some leave because of wear on knees and backs, after-hours emergency calls or weather on construction sites. Many stay in the trade by moving into estimating, inspection, teaching, supervision or owning a business. Pay and demand differ by region; the Bureau of Labor Statistics Occupational Outlook Handbook has current national figures.

Starting as a career changer

Apprenticeships take adults, and people come from retail, restaurants, the military and offices. Starting pay may be lower than your current job, but it rises with each stage. Compare plumbing with electrical work and HVAC, which follow similar paths. Our guide on careers without a degree has more ideas.

Where a mentor helps

Getting an apprenticeship means tracking application windows, studying for aptitude tests and following up with contractors. Finishing one means four or more years of early starts, physical work and evening classes. A mentor helps with planning, accountability and the habits that make a first-year apprentice someone foremen want to keep. For teens, a parent is part of the plan. Mentors are not career counselors with credentials or licensing experts. See career and education mentoring and mentoring for high school students.

Common questions

How long does it take to become a plumber?

A typical apprenticeship lasts four to five years before the journeyman exam. A master license requires additional years of experience.

Do plumbers need to go to college?

No. Most plumbers train through paid apprenticeships after high school. A trade school or pre-apprenticeship program can help you get hired but is not always required.

Is plumbing a good trade for someone who likes working with people?

Yes, especially service plumbing, where you explain problems and options to customers every day. Construction plumbing involves more time with a crew and less with the public.

What is the difference between a journeyman and a master plumber?

A journeyman is licensed to work independently. A master plumber has more experience, has passed a more advanced exam and can usually supervise others and pull permits.

Get started

Considering a plumbing apprenticeship and want help with the plan? Call (888) 305 5422, email contact@blackburnmentoring.com or start with a short assessment. A member of our team reviews every assessment personally and sets up a free intro call.

How to Become a Plumber: Apprenticeship, Licensing and Getting Hired