Yes, but only at the contractor level. California has no state journeyman or master plumber license, so a plumbing license in California means the C-36 Plumbing Contractor license from the Contractors State License Board (CSLB). You need it to contract for plumbing jobs worth $1,000 or more in labor and materials. Employee plumbers working for a licensed contractor don’t hold their own state plumbing license.
Who issues the license
The Contractors State License Board (CSLB), part of the California Department of Consumer Affairs, licenses all contractors in the state, including plumbing contractors. It handles applications, exams, bonds, renewals, and the public license lookup.
The C-36 scope is set out in the CSLB C-36 classification (Title 16 of the California Code of Regulations). It covers water supply and waste piping, on-site waste disposal connections, gas piping and gas appliances (but not forced warm air units), water and gas lines from the meter to the building, water heaters including solar, and the maintenance and replacement of all of it, including backflow preventers and earthquake valves.
A common mix-up: California’s Department of Industrial Relations certifies electricians, not plumbers. There’s no state plumber card. Cities and counties handle permits and inspections, and they generally expect permit work to be done by a CSLB-licensed contractor or by a property owner under their own permit.
Requirements change, so always confirm with the CSLB before you apply. This page is a plain-English guide, not legal advice.
License types
- C-36 Plumbing Contractor. The license you need to bid, contract, and run plumbing jobs on your own. It’s issued to a business (sole owner, partnership, corporation, or LLC) that is qualified by one person who meets the experience rule and passes the exams.
- Active vs. inactive. An active license lets you contract work and needs a bond. An inactive license keeps your license alive without a bond while you aren’t contracting.
- Employee plumbers. No state license. You work under the contractor who employs you.
- Apprentices. Not a license. Registered apprenticeships run through the state’s Division of Apprenticeship Standards and union or employer programs.
Related CSLB classifications exist if you only want part of the trade, such as C-42 Sanitation Systems, C-34 Pipeline, or C-4 Boiler, Hot Water Heating and Steam Fitting. Compare scopes on the CSLB site before you pick one.
How to become a plumber in California
Because there’s no state journeyman license, the path is really about building enough experience to qualify for the C-36. Here’s how it usually goes:
- Step 1: Get into the trade. Join a registered apprenticeship or get hired as a helper by a licensed plumbing contractor. You can do employee plumbing work without your own license.
- Step 2: Reach journey level. CSLB defines a journeyperson as an experienced worker, not a trainee, who can do the trade without supervision, or someone who finished an apprenticeship.
- Step 3: Log 4 years. The person qualifying the license needs at least 4 full years of journey-level experience (as a journeyperson, foreman, supervisor, or contractor) within the 10 years before applying.
- Step 4: Apply and test. Submit the application, get fingerprinted, pass the exams, then file your bond and fees.
CSLB may give credit toward the 4 years for a completed apprenticeship, technical training, or a degree from an accredited school, reviewed case by case. You still need at least 1 year of practical journey-level work. Someone other than you (an employer, coworker, contractor, union rep, inspector, or past client if you were self-employed) must sign a Certification of Work Experience. You must be at least 18.
Exams
Most first-time applicants take two computer-based, multiple-choice exams at PSI test centers:
- Law and Business. California construction law and business management.
- C-36 trade exam. Closed book. Per the March 2026 CSLB study guide, it covers planning and estimating (22%), underground and rough systems (22%), finish plumbing (20%), service, repair, and remodel (19%), and safety (17%).
You get 3½ hours for each exam. You have 18 months after CSLB accepts your application to pass both, and a passing score is good for 5 years, so if you fail one you only retake that one. Rescheduling costs a fee paid to PSI. Before licensing, you also complete an open-book asbestos exam.
CSLB can waive the trade exam in a few cases, such as if you’ve been the qualifier on a C-36 license in good standing within the last 5 years, or passed both exams for C-36 in that time. You still document your 4 years of experience either way.
Renewal
Your first license is good for 2 years. After that, active licenses renew every 2 years and inactive ones every 4 years. CSLB mails a renewal notice about 60 days before expiration, and your renewal has to reach CSLB before the expiration date to avoid a gap. Single-qualifier licenses can renew online.
CSLB’s renewal pages don’t list any continuing education requirement for C-36 contractors. Late renewals cost more (see below). If you renew within 90 days after expiration, CSLB’s renewal page says the license is reinstated retroactively.
Cost
From the CSLB fee list:
- Application: $450, nonrefundable.
- Initial license (2 years): $200 for a sole owner, $350 for a non-sole owner.
- Active renewal: $450 sole owner, $700 non-sole owner. Late: $675 and $1,050.
- Inactive renewal: $300 sole owner, $500 non-sole owner.
- Adding a classification later: $230.
- Fingerprints: varies by Live Scan location.
Then the business costs. Since January 1, 2023, every active license needs a $25,000 contractor bond (or cashier’s check). If your qualifier is an RME, or an RMO owning less than 10% of the company, add a $25,000 bond of qualifying individual. LLCs also need a $100,000 LLC/worker bond plus liability insurance of $1 million aggregate for up to five listed personnel, $100,000 more per extra person, capped at $5 million.
Workers’ comp: if you have employees, or your qualifier is an RME, you need a workers’ comp certificate. If not, you file an exemption. Heads up: under SB 1455, all licensees must carry workers’ comp starting January 1, 2028, employees or not.
Reciprocity
CSLB has reciprocity agreements with Arizona, Louisiana, Mississippi, Nevada, and North Carolina, but only for matching classifications. On the CSLB reciprocal classifications list, plumbing (C-36) only matches Arizona’s plumbing classes (such as C-37, C-37R, K-37, K-77, L-37, and L-77). Nevada, Louisiana, Mississippi, and North Carolina have no plumbing match.
If you qualify, you need an active license in good standing in that state for the previous 5 years. CSLB may waive the trade exam but can still require it, and you still have to pass the Law and Business exam. Utah is not on CSLB’s list. See our plumbing license reciprocity guide for how other states compare.
How to apply
- Pick your structure. Sole owner, partnership, corporation, or LLC. It changes your fees, bonds, and insurance.
- Fill out the application. Use the Application for Original Contractor’s License, including the Certification of Work Experience, from the CSLB forms page. A fillable version is on the CSLB site.
- Pay $450. You can send the initial license fee at the same time to speed things up.
- Fix problems fast. If CSLB sends the application back, you have 90 days to correct it or it’s void.
- Fingerprint and test. Follow CSLB’s Live Scan instructions, then schedule with PSI.
- Finish issuance. After you pass, CSLB sends a bond and fee letter. Submit the bond, initial fee, asbestos exam, and workers’ comp certificate or exemption.
You can track your application and verify any contractor on the CSLB website.
FAQ
Does California have a journeyman plumber license?
No. California only licenses plumbing contractors (C-36) through the CSLB. Employee plumbers work under their employer’s license.
How much does a C-36 license cost?
$450 to apply plus $200 for a sole owner’s initial license, so $650 to start. Add your $25,000 bond premium, fingerprints, and insurance.
How long does it take to get a California plumbing license?
You need 4 years of journey-level experience first. After that, timing depends on CSLB processing times, which it posts on its website, and on how fast you pass the exams.
Can I do small plumbing jobs without a license?
Only if the whole job is under $1,000 in labor and materials, needs no permit, and you hire no one. That limit went up from $500 on January 1, 2025.
Next steps
Start your experience paperwork now, since the signed work verification is what slows most people down. Compare California with other states on our plumbing license by state page and the full plumbing license guide. If you hold an Arizona plumbing license, the Arizona plumbing license page explains your side of the reciprocity deal. Once your C-36 is active, read how to start a plumbing business.
