How Long Does It Take to Get a Plumbing License

The Short Answer: 4 to 7 Years for Most Plumbers

Getting a plumbing license isn't a weekend certification. The typical path from zero experience to holding a journeyman or master plumber credential takes 4 to 7 years, depending on your state's requirements and which license level you're pursuing.

That timeline breaks down into two main phases: accumulating supervised work hours and passing your licensing exams. Here's how each phase stacks up.

Apprenticeship Phase: 8,000 to 10,000 Hours

Most states require between 8,000 and 10,000 on-the-job training (OJT) hours before you can sit for a journeyman exam. At 40 hours per week, 50 weeks per year, that's 4 to 5 years of full-time work under a licensed plumber.

During this period you'll also need related technical instruction (RTI) — typically 144 hours per year of classroom or online coursework covering code, safety, and system design.

Two main paths exist for logging these hours:

• Formal union apprenticeship through a Joint Apprenticeship Training Committee (JATC) affiliated with the United Association of Plumbers and Pipefitters. These programs structure your hours, pair you with rotating mentors, and track everything for you.
• Informal employment under a licensed master or contractor. You log the same hours, but you're responsible for keeping your own records — employer letters, W-2s, and supervisor sign-offs.

The formal route is more structured but harder to get into. The informal route is more accessible but requires meticulous recordkeeping. Either way, the clock starts when you start working.

Journeyman License: 4 to 5 Years Total

Once you've accumulated the required hours, you apply to take your jurisdiction's journeyman exam. In most states, this exam covers the International Plumbing Code (IPC), pipe sizing, DWV system design, and OSHA safety standards.

The exam itself might take a few weeks to schedule and complete. The bottleneck is usually the hours requirement, not the test.

Some states — Mississippi is a notable example — don't issue journeyman licenses at the state level at all. Instead, individual cities and counties administer their own journeyman trade cards. That means your timeline depends partly on which municipality you're working in and how frequently they schedule exams.

Master Plumber License: 6 to 7 Years Total

Most states require 1 to 3 additional years of work as a licensed journeyman before you can apply for a master plumber credential. The master license typically allows you to pull permits independently, supervise apprentices, and operate your own plumbing business.

The master exam is more comprehensive, covering business management, estimating, and supervisory requirements in addition to the technical code material.

State Contractor License: Add 2 to 6 Months

If you plan to run your own plumbing business and take on projects above certain dollar thresholds, you may also need a state contractor license on top of your individual trade credential.

In Mississippi, for example, commercial and mechanical MSBOC classifications require a CPA-reviewed or audited financial statement; residential applications use a dated GAAP balance sheet rather than a mandatory CPA review. The MSBOC also requires general liability insurance ($300,000/$600,000 minimums) and state exams administered through PSI. After you submit the application, the MSBOC enforces a strict 180-day window to complete the remaining requirements and required exams; otherwise, the board destroys the incomplete application and forfeits the application fee.

That 180-day clock adds real pressure. Getting the required financial statement prepared, booking your exam dates, and collecting your three references (including one bank reference) all need to happen in sequence. Budget 3 to 6 months for this phase.

What Can Slow You Down

A few common delays push timelines beyond the standard range:

• Gaps in documentation. If you can't produce W-2s or employer letters for periods of work, your hours may not count. Keep records from day one.
• Failed exams. Retake timing varies by the exam administrator, and each attempt costs time and money.
• Financial shortfalls. State contractor applications often require minimum net worth thresholds — $20,000 for a plumbing specialty in Mississippi. If your balance sheet falls short, you'll need to build capital before applying.
• Local vs. state coordination. In states like Mississippi where individual trade licenses are local but business licenses are state-level, you're navigating two separate bureaucracies with their own timelines.

Fastest Realistic Path

If everything goes smoothly — you start a formal apprenticeship at 18, log your hours without interruption, pass your journeyman exam on the first attempt, work the required additional years, and pass your master exam — you're looking at about 6 years from start to master plumber.

Add the state contractor application and you're at 6.5 to 7 years before you can legally bid on large projects independently.

There's no shortcut around the hours. But having a clear roadmap of what's required at each stage — and what paperwork to gather along the way — prevents the delays that stretch a 5-year timeline into an 8-year one.

If you're working through the Mississippi licensing path specifically, the Mississippi Plumber License Guide walks through the dual-tier system (state MSBOC business license plus local municipal trade cards) step by step, including the 180-day application timeline and CPA financial prep.

See more Mississippi guides →