In short
A master plumber usually needs one or more years of experience as a licensed journeyman, sometimes more, plus a master exam that adds system design, sizing, code administration and sometimes business and law. In many states, masters pull permits, supervise journeymen and apprentices, and serve as the qualifying license for a plumbing contractor. Each state or city sets its own rules.
What changes at master
- You sign for permits and inspections
- You design and size whole systems
- You can supervise other plumbers
- You can usually qualify a plumbing business
Pay
Plumbers in the top 10 percent earned more than $108,420 in May 2025, and many of them are masters running service work or crews.
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Straight answers
How long does it take to become a master plumber?
Often six to eight years from the start of an apprenticeship, depending on the state.
Do I need a master license to start a plumbing business?
In many states, a plumbing business needs a master on the license. Check your state board.
Is a master plumber the same as a plumbing contractor?
Not always. Some states license contractors separately from individual plumbers.