How Do You Get a Plumbing License in California?

Only for contract work.

Any California construction job of $1,000 or more in labor and materials, or any job needing a building permit, requires a CSLB license — the $500 figure still printed in CSLB's Get Licensed to Build guide was raised to $1,000 by AB 2622, effective January 1, 2025.

For individuals, our research found no state journeyman or master plumber license: no state agency issuing individual plumber licenses turned up in the sources we read, so confirm with CSLB before you rely on that absence.

What the statute does say plainly is who needs no license at all: the employee.

In our research, California has one plumbing credential, and it sits at the contractor level: CSLB's C-36 Plumbing Contractor classification.

In CSLB's definition, a plumbing contractor provides the means for a safe water supply, ample in volume and of suitable temperature, and the proper disposal of fluid waste from the premises in all structures and fixed works — the full scope of the trade in one classification, not a specialty slice.

There is no journeyman rung and no master rung in our research: a plumber either works as an employee of a licensee, needing no license, or holds — or backs as the qualifier of — a C-36.

Because the C-36 is a contractor license, the experience requirement attaches to the qualifier — the person whose background backs the license.

The qualifier must be at least 18 and have at least four years of journey-level experience in the classification within the 10 years before applying; journeyperson, foreperson, supervising employee and contractor work all count.

The qualifier can be the owner, as a Responsible Managing Officer, or a qualifying employee, as a Responsible Managing Employee.

Before CSLB issues any license, the applicant is fingerprinted and passes an open-book asbestos exam.

Fees (2026): $450 to apply in one classification, then $200 for the initial license for a sole owner or $350 for a non-sole owner; replacing a qualifier costs $230.

PSI Exams administers CSLB's licensing exams at test centers throughout California.

A C-36 applicant takes two computer-based exams — the law and business exam and the C-36 trade exam — unless a waiver applies, which for out-of-state licensees means the reciprocity route below.

Our research does not describe what either exam covers; CSLB's exam guidance and the PSI candidate information it points to are the place to check the current content outline.

CSLB licenses run on two-year cycles: a license is issued for two years, and active licenses renew every two years (inactive ones every four).

Renewal fees run $450 for a sole owner and $700 for a non-sole owner.

On continuing education, our research did not confirm a general CE requirement for CSLB renewals — the fee schedule we read lists none — but an absence that hard to prove is not a promise, so ask CSLB before you count on renewing without CE hours.

There is no journeyman or master plumbing license to transfer into California in the first place — the state credential is the C-36 contractor license.

What CSLB does offer is a set of contractor reciprocity agreements: with Arizona, Louisiana and Nevada, the trade exam may be waived case by case, while the law and business exam is still required.

So an out-of-state journeyman moving to California plans around the same qualifier experience requirement as anyone else, rather than a license swap.

CSLB's site links a Check a License service for looking up its licensees; our research recorded the link but did not open the tool page itself, so start from cslb.ca.gov and follow the board's current Check a License path.

A lookup answers two questions before you rely on a license: whether the firm's C-36 classification is active, and who the qualifier behind it is.

Our research did not find a state-level gas fitter license or backflow tester certification for plumbers, and it did not check city, county or water-agency credentials at all — treat that as an open question, not a confirmed absence.

Ask the water supplier or the building department where the work will be done what certification they require before you bid this kind of job.