How to Get a Plumbing License in California: Journey-Level Work and the C-36 License

Do you need a license to be a plumber in California?

Not to work as an employee. CSLB's journeymen FAQ says a journey-level person "does not have a license" and can't contract jobs that require a building permit, use employee labor, or go over $1,000 in labor and materials (CSLB). In practice, plumbers in California work for a licensed contractor until they qualify for their own C-36. We found no separate state certification for plumbers comparable to California's electrician certification; some cities may have their own requirements, so ask the building department where you work.

What CSLB calls journey-level experience: "Journey-level experience applies to a person who has completed an apprenticeship program or is an experienced worker" able to do the trade without supervision (CSLB).

What does a C-36 plumbing contractor do?

CSLB's C-36 classification opens: "A plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature." It goes on to cover waste removal and on-site waste disposal systems, gas and liquid piping (including medical gases and compressed air), gas appliances and flues (but not forced warm-air units), piping from the owner's side of the meter, water heating equipment including solar, and devices like earthquake gas valves, backflow preventers and water conditioning equipment.

Heat pump water heaters are shared territory: CSLB says they can be installed by a C-36, whose scope includes "any type of equipment to heat water," or a C-20 HVAC contractor. HVAC system heat pumps are C-20 only (CSLB fast facts).

What are the C-36 license requirements?

How do you become a licensed plumbing contractor in California, step by step?

1. 1

   Learn the trade through an apprenticeship or on the job

   CSLB notes "A plumbing apprenticeship is normally five (5) years," and that applicants then add four years of journeyman time (CSLB). Keep apprenticeship certificates; they're the written proof CSLB wants for training credit.

2. 2

   Document four full years at journey level

   CSLB wants you to show you "performed plumbing every day for four (4) full years." Foreman, supervisor and owner-builder time count too (CSLB).

3. 3

   Apply with the $450 fee

   Once the application is accepted, the 18-month clock to pass both exams starts (CSLB exam FAQ).

4. 4

   Pass Law and Business and the C-36 exam

   The C-36 exam covers Planning and Estimating (22%), Underground and Rough Systems (22%), Finish Plumbing (20%), Service, Repair and Remodel (19%) and Safety (17%), including fuel gas piping and water conservation (C-36 study guide). No books allowed. A failed exam can be retaken after 21 days (CSLB exam FAQ).

5. 5

   Post your bond, file workers' comp and pay the license fee

   Post the $25,000 contractor bond and pay $200 (sole owner) or $350. A contractor with no employees can generally file a workers' comp exemption; C-36 isn't on CSLB's list of classifications barred from exemption, but a license qualified by a Responsible Managing Employee can't use one (CSLB).

Can you use an out-of-state plumbing license in California?

Arizona is the main route. CSLB's reciprocal list maps Arizona's C-37 plumbing licenses (and related K and L classes) to the C-36; Nevada has no listed plumbing match. Under reciprocity CSLB may waive the trade exam but you still take Law and Business (CSLB reciprocity).

Starting your own plumbing company in California

• Under $1,000 isn't a business plan: the minor-work exemption disappears the moment a job needs a permit or you hire help (CSLB). Get the C-36 before you take real work.
• Gas and water heaters: gas appliance connections and water heaters are in C-36 scope; forced-air furnaces are C-20.
• Taxes: California sales and use tax on fixtures and materials, and entity filing, are in California contractor taxes and licensing.
• Business setup: entity, trucks, pricing and first customers are in how to start a plumbing business.