Join as a Pro
California Plumbing

California plumbing license guide

California plumbing contracting is licensed through CSLB under the C-36 Plumbing Contractor classification. This page explains the official classification and the general CSLB experience path.

The short answer

California plumbing contractors should review CSLB's C-36 Plumbing Contractor classification before bidding covered plumbing work. CSLB generally requires four years of qualifying experience in the classification before an applicant qualifies for the exam.

Who this applies to

  • Contractors contracting for covered plumbing work in California should confirm whether C-36 is the right CSLB classification.
  • A qualifying individual must have the experience and skills CSLB requires for the plumbing classification.
  • Businesses should also verify bond, insurance, local permit, and business-license steps before taking jobs.

Requirement snapshot

Authority California Contractors State License Board
Classification CSLB lists C-36 as Plumbing Contractor.
Scope snapshot CSLB says C-36 covers a means for safe water supply and proper disposal of fluid waste from premises in structures and fixed works.
Experience CSLB says applicants generally need at least four full years of journey-level or higher experience in the classification, within the 10 years before filing.
Education credit CSLB says some technical training, apprenticeship training, or education may receive credit toward the experience requirement.
Application path Follow CSLB's original contractor license exam application process for the C-36 classification.

Practical application path

  1. Review CSLB's C-36 classification description.
  2. Confirm the qualifying individual and gather certification of work experience.
  3. Use CSLB's application materials for the original contractor license exam path.
  4. Complete the exam, fingerprinting, bond, and issuance steps as instructed by CSLB.
  5. Before advertising plumbing work, confirm local permit and business-operation requirements.

Watchouts before you sell the work

  • Do not confuse California contractor licensing with local plumbing permits or inspections.
  • Drain, gas, water-heater, and mechanical-adjacent work can raise scope questions; verify the correct classification before bidding.
  • If a company relies on a qualifier, understand the qualifier relationship before using the license to sell jobs.

Official source links

CSLB C-36 Plumbing classification https://www.cslb.ca.gov/about_us/library/licensing_classifications/Licensing_Classifications_Detail.aspx?Class=C36 CSLB before applying https://www.cslb.ca.gov/contractors/applicants/contractors_license/exam_application/before_applying_for_license.aspx CSLB qualifying experience https://www.cslb.ca.gov/contractors/applicants/contractors_license/exam_application/experience_for_exam.aspx

FAQ

What is the California plumbing contractor classification?

CSLB lists plumbing contracting under the C-36 Plumbing Contractor classification.

What experience does CSLB require for plumbing contractors?

CSLB says applicants generally need at least four full years of qualifying experience in the classification they apply for, within the 10 years before filing.