Becoming a licensed plumber takes four to six years from your first day as an apprentice to holding a journeyman card, and longer if you’re aiming for a master plumber license. The path is regulated at the state and sometimes city level, so exact requirements vary, but the general structure is consistent across most of the United States: education or pre-apprenticeship, a registered apprenticeship with paid on-the-job hours, an exam, and then additional years of experience before you can pursue higher license tiers.
Step 1: Get Into an Apprenticeship
Most plumbers start through a registered apprenticeship program, either through a union local (like a UA-affiliated plumbers and pipefitters union) or a non-union contractor association such as the ABC (Associated Builders and Contractors) or PHCC (Plumbing-Heating-Cooling Contractors association). These programs combine paid work hours with classroom instruction.
Entry requirements typically include:
- Being at least 18 years old
- A high school diploma or GED
- Passing basic math and reading assessments (algebra and fractions come up often on entrance tests)
- A clean-ish background check, though this varies by program
- Sometimes a physical or drug screening before placement
Union apprenticeships are competitive. Some locals only accept 20-40 new apprentices per year out of several hundred applicants. Non-union routes through trade schools or contractor associations tend to have lower barriers to entry but also less standardized pay progression.
Step 2: Complete Apprenticeship Hours and Classroom Training
A standard apprenticeship runs 4-5 years and requires around 8,000-10,000 hours of on-the-job training, plus 500-1,000 hours of classroom instruction depending on the state. You’ll work under a licensed journeyman or master plumber the entire time, rotating through residential, commercial, and sometimes industrial work.
Apprentice pay starts low and increases on a schedule. A first-year apprentice might earn $16-19 an hour, while a fourth or fifth-year apprentice can be making $28-34 an hour before becoming a journeyman. Union apprenticeships usually have fixed wage scales tied to a percentage of journeyman pay (50% in year one, rising to 80-90% by the final year). Non-union pay varies more by region and employer.
Classroom instruction covers plumbing code (usually the International Plumbing Code or Uniform Plumbing Code, depending on your state), blueprint reading, pipe sizing, backflow prevention, gas line work, and safety certifications like OSHA 10 or OSHA 30.
Step 3: Pass the Journeyman Exam
Once you’ve logged your required hours, you’re eligible to sit for the journeyman plumber exam. This is a state-administered test (or in some cases, city-level, like in Chicago or New York) that covers code knowledge, math, and practical application.
Exam costs typically run $50-200 for the application and testing fee, though some states charge more if you need to submit documentation or retake sections. Pass rates vary widely, but most apprentices who complete their hours and study the code book pass within one or two attempts. Study materials specific to your state’s adopted code edition cost $75-150, and many people also pay $200-400 for a prep course, though this isn’t required.
Once you pass, you receive your journeyman plumber license, which allows you to work independently (though usually still under a licensed contractor’s business) without direct supervision.
Step 4: Decide Whether to Pursue a Master Plumber License
A journeyman license lets you do the work. A master plumber license lets you pull permits, run your own plumbing business, and legally supervise apprentices and journeymen. Most states require 2-5 years of experience as a journeyman before you’re eligible to test for master status.
The master exam is more comprehensive and often includes business and law components (contracts, liability, workers’ comp requirements) alongside advanced technical code questions. Fees run similarly to the journeyman exam, $75-250 depending on the state, and some states require proof of liability insurance and a surety bond before issuing the license.
Not every plumber pursues a master license. Many spend an entire career as a journeyman, especially those who prefer working for an established contractor rather than running their own business. The master license mainly matters if you want to be the person of record on permits or open your own shop.
Total Costs Add Up, But Slowly
Unlike a four-year college degree, becoming a licensed plumber rarely puts you into debt. You’re earning wages throughout the process rather than paying tuition. Rough cost breakdown across the full path:
- Application and enrollment fees for apprenticeship programs: $0-150
- Tools (a basic starter set, which grows over time): $500-1,500 in year one, with ongoing purchases
- Classroom materials and textbooks: $300-600 total across the apprenticeship
- Journeyman exam fees and prep: $150-450
- Master exam fees, bond, and insurance (if pursued): $500-1,500
Total out-of-pocket cost across four to six years typically lands between $1,500 and $4,000, spread out over that entire period, not paid upfront. Compare that to trade school-only routes (without an apprenticeship), which can run $10,000-15,000 in tuition but shorten the classroom portion.
Realistic Timeline Summary
Year one is spent applying, testing into a program, and starting as a first-year apprentice. Years two through four or five involve steadily increasing responsibility, pay raises, and classroom hours. Around year four or five, you sit for your journeyman exam. If you want to run your own business or supervise crews, expect another two to five years of journeyman experience before testing for master status. Total time from zero experience to master plumber license: 7-10 years for most people, though some states allow faster progression with documented experience.
If you’re considering this path, start by contacting your state’s licensing board (often under the Department of Labor or a dedicated contractor licensing board) to get the exact hour requirements and exam structure for your state, since these details shift year to year and vary more than people expect.
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