To get licensed as a plumber, most states make you log 4,000 to 8,000 hours of supervised work, pass a trade exam covering plumbing code, and carry a surety bond plus liability insurance. The path runs in tiers — apprentice, then journeyman, then master — and each tier widens what you can legally do and charge for.
The catch is that there is no single national plumbing license. Requirements are set state by state, and a few states hand it down to the city or county. Below is the structure that holds in most places, plus the exact things you should confirm with your own state board before you spend a dollar on exam prep.
In most states you register as an apprentice and work under a licensed plumber. Some states require nothing more than registration and a sponsoring employer; others want you enrolled in a related-instruction program. This is where you bank the 4,000–8,000 hours that qualify you for the journeyman exam.
After the required hours, you sit for a journeyman exam built on your state's plumbing code (most are based on the UPC or IPC). Passing lets you do plumbing work independently on the job, though you typically still work under a master's license or a licensed company.
Usually one to two more years as a journeyman, then a harder exam covering code, design, and business law. A master can pull permits, open a plumbing business, and supervise apprentices and journeymen. This is the tier you need to legally own and run a plumbing company in most states.
Beyond hours and the exam, the paperwork side is where new plumbers get tripped up. Have these ready:
A quick honesty check, because we would rather you spend your money in the right order:
The single source of truth is your state's plumbing or contractor licensing board. Treat every "national requirement" list, including this one, as a starting map, not the final word.
A master license lets you pull permits and run a company — but customers still have to find you. The fastest way to turn a fresh license into booked calls is a site that shows your license number, lists the work you do, and lets a homeowner call or message you in one tap. We build that, and we run it on our own home-service companies first.
See how it works for plumbers on our plumber website design page, what monthly content does on SEO for plumbers, and the after-hours AI receptionist that catches the leak call at midnight. New to all of it? Start with whether local SEO is worth it.
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Most states require 4,000 to 8,000 supervised hours — about two to five years as an apprentice — before the journeyman exam. A master license usually adds one to two more years of journeyman experience.
No. Most license at the state level, but some leave it to cities and counties, and a few have no statewide plumbing license. Reciprocity between states is limited, so check the board where you actually work.
Exam and application fees usually run $100 to $400. The bigger ongoing costs are the surety bond ($5,000–$20,000 in coverage) and liability insurance, which together run a few hundred to a couple thousand dollars a year.
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