How do you get a California plumber license (CSLB)?
California does not issue a journeyman plumber licence. The state licenses contractors, and the plumbing classification is the CSLB C-36 Plumbing Contractor licence. To get it you need four years of journey-level (or higher) plumbing experience gained in the last ten years, passing scores on the Law & Business exam and the C-36 trade exam (administered for CSLB by PSI), a $450 application fee, a $200 initial licence fee, and a $25,000 contractor licence bond. A plumber employed by a licensed contractor needs no state licence at all.
- Work four years at journey level or above (within the last ten years).
- Apply to CSLB for an original C-36 licence and pay the $450 fee.
- Pass the Law & Business exam and the C-36 trade exam through PSI.
- File a $25,000 contractor licence bond and pay the $200 initial licence fee.
- Carry workers' comp (or an exemption), and renew every two years.
Governing law: California Contractors State License Law (California Business and Professions Code, Division 3, Chapter 9)
California plumber license at a glance
This guide is general information about California licensing, not legal advice. CSLBrules, fees and deadlines change — confirm your own position with the board, or with a licensed attorney, before you rely on anything here.
California plumber license types: the full CSLB ladder
There is no journeyman rung in California's state system, and that surprises plumbers moving from Texas or Florida. The state licenses contractors through CSLB; an employed plumber works under a licensed contractor with no state credential of their own, and journey-level standing comes from an apprenticeship rather than from Sacramento.
Employed plumber (no state licence)
California issues no licence to individual plumbers. As an employee of a licensed contractor you may legally perform plumbing work with no state credential of your own, which is why so many California plumbers never hold a licence.
Registered apprentice (DAS)
Register with the Division of Apprenticeship Standards, typically through a UA local or a state-approved programme. Roughly five years of paid on-the-job training plus classroom instruction, and the standard route to journey level.
Journey-level plumber (union or employer)
Journey standing is conferred by completing an apprenticeship, not by the state. It is what makes your years count toward the C-36 experience requirement, and it is what employers actually hire on.
C-36 Plumbing Contractor
The state licence. Lets you contract plumbing work to the public in your own name. Requires four years of journey-level experience, both PSI exams, the $25,000 bond and insurance.
C-4 Boiler, Hot Water Heating and Steam Fitting
A separate CSLB classification for boiler, hot-water heating and steam-fitting work. Held alongside a C-36 by contractors who take on that work.
Backflow prevention tester
A separate certification (issued through local water agencies and bodies such as AWWA or ABPA) required to test and certify backflow assemblies. Independent of the CSLB licence.
B General Building Contractor
The broader CSLB classification for projects involving two or more unrelated trades. Plumbing contractors sometimes add it, but it does not replace the C-36 for plumbing-only work.
Exact experience hours and fees vary by license type and can change, confirm current requirements on the CSLB Plumber program page.
Employed plumber vs C-36 contractor Plumber in California, what is the difference?
How do you get a California CSLB C-36 Plumber license?
- 1
Build four years of journey-level experience
CSLB requires four full years of experience at journey level or above (journeyman, foreman, supervisor or contractor), gained within the last ten years. Apprentice time does not count toward the four years. Register through the Division of Apprenticeship Standards or a UA local, and keep records: your experience must be certified by a qualified person with direct knowledge of your work.
- 2
File the Application for Original Contractor's License
Submit the application to CSLB naming yourself (or your business's qualifying individual) for the C-36 Plumbing classification, with the $450 application fee. CSLB reviews the application and your certified experience, then issues a notice to appear for examination, typically within several weeks.
- 3
Pass the Law & Business and C-36 trade exams
PSI administers both exams for CSLB. The Law & Business exam covers California construction law, contracts, licensing law, employment, safety and lien law. The C-36 trade exam covers plumbing systems, water supply and drainage, gas piping, fixtures, and the California Plumbing Code (Title 24, Part 5), which is derived from the Uniform Plumbing Code. Results are reported pass or fail; CSLB does not publish a fixed percentage.
- 4
File the $25,000 bond, pay the licence fee, and get insured
Within 90 days of passing you must file a $25,000 contractor licence bond and pay the $200 initial licence fee. If you have employees you must carry workers' compensation insurance; if you do not, file an exemption certificate. Once CSLB has all of it, your C-36 issues and appears in the public licence lookup.
Does a California plumber license transfer to other states?
CSLB has reciprocity agreements with Arizona, Nevada and Utah covering certain classifications, which can waive the trade exam for a contractor who has held an equivalent active licence in good standing in that state for the required period. The Law & Business exam is generally still required, and the agreements and covered classifications change. Confirm current terms with CSLB before relying on an out-of-state licence, and note that because California has no journeyman licence there is nothing to reciprocate at the individual tradesperson level.
States CSLB has recognized (confirm current status before relying on this):
Reciprocity agreements change, always confirm the current list and requirements on the CSLB Plumber program page before applying.
How much does a California plumber license cost, and how long does it take?
The C-36 costs $450 to apply and $200 for the initial licence, and both exam sittings are included in the application fee. The $25,000 contractor licence bond is the other mandatory cost, typically purchased for a few hundred dollars a year in premium depending on credit. From a complete application, most applicants are licensed within 2-4 months.
California C-36 exam details and license lookup
What is on the CSLB C-36 exams?
There are two exams, both administered for CSLB by PSI. The Law & Business exam covers California construction law, contracts, licensing law, employment, safety and lien law, and applies to every contractor classification. The C-36 trade exam covers water supply and distribution, drain, waste and vent systems, gas piping, fixtures and appliances, and the California Plumbing Code (Title 24, Part 5), which is derived from the IAPMO Uniform Plumbing Code. Both are closed book and computer-based. CSLB reports results as pass or fail and does not publish a fixed passing percentage.
How to verify a California plumber license
Anyone can confirm a licence for free using the CSLB 'Check a License' search at cslb.ca.gov. Enter the licence number or business name to see the classification (C-36 for plumbing), status, bond and workers' compensation coverage, and any disciplinary history. Homeowners and employers should always confirm an active C-36 before a contractor pulls a plumbing permit. GlobalCybers verifies every candidate's credentials before they reach your portal.
Does California have a journeyman plumber license?
No, and this is the single biggest misunderstanding about plumbing in California. The state licenses contractors, not individual tradespeople. There is no state journeyman plumber licence to apply for, no state journeyman exam, and no state card to carry. Journey-level standing is conferred by completing an apprenticeship, usually through a
UA local or a programme registered with the Division of Apprenticeship Standards, and it is your employer and the union, not the state, who recognise it.
Can I work as a plumber in California without a license?
Yes, as an employee. If you work for a licensed C-36 contractor, you may legally perform plumbing work with no state licence of your own. What you cannot do is contract plumbing work directly to the public: any job of $500 or more in combined labour and materials requires a
CSLB licence, and contracting without one is a misdemeanour that CSLB actively enforces through sting operations.
California Plumber licenses, Frequently Asked Questions
CSLB, C-36 Plumbing Contractor classification · CSLB, List of All Fees · CSLB, Application for Original Contractor's License · California Business and Professions Code, Contractors State License Law (Div. 3, Ch. 9) · California Plumbing Code (Title 24, Part 5), based on the IAPMO Uniform Plumbing Code · U.S. Bureau of Labor Statistics, OEWS May 2025 (47-2152). Fees and rules can change, confirm current details at www.cslb.ca.gov/about_us/library/licensing_classifications/Licensing_Classifications_Detail.aspx?Class=C36 before applying.
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