When a California plumbing contractor license is required
Within CSLB contractor licensing, C-36 is the classification for a plumbing contractor. (Title 16, section 832.36) If you bid, contract, or operate a plumbing company, that is normally the relevant CSLB classification. For CSLB experience purposes, 16 CCR section 825 defines a journeyman as a fully qualified trade worker who can perform without supervision, or someone who completed an apprenticeship program. (16 CCR section 825) This contractor-license guide does not establish that every worker is exempt from separate local credential, registration, apprenticeship, or permit rules; check the city, county, project, and employer requirements that apply.
Under Business and Professions Code section 7048, California’s minor-work exemption applies only when the work is casual, minor, or inconsequential, aggregate labor, materials, and all other project items are less than $1,000, and the work does not require a building permit. The exemption also disappears if the person advertises as a contractor or employs someone to help perform the work. A larger project cannot be split into smaller contracts to evade licensing.
For the broader career sequence, see our plumbing license guide.
What C-36 covers
California’s C-36 classification is broader than fixtures. Title 16, section 832.36 defines a plumbing contractor as providing safe water supplies and proper disposal of fluid waste. The listed scope includes waste systems; piping, tanks, and vents for gases and liquids; gas appliances and connections; piping from the owner’s side of the meter; water-heating equipment; and maintenance of covered systems and safety devices.
Confirm permits locally. CSLB’s building-permit guidance says code requirements vary among California cities and counties and directs users to the local building department.
Experience, qualifier, and exams
The license belongs to an individual or business entity, but a qualifying individual supplies the required experience and knowledge. Under 16 CCR section 825, an applicant generally must document at least four years of experience within the 10 years immediately before applying as a journeyman, foreman, supervising employee, or contractor in the requested classification. A former qualifier in the same classification may compute experience without the 10-year limit, and protected armed-forces service time may be added to that period. Approved training may count, but no more than three years.
Section 7065 provides for a written examination covering trade knowledge, California laws, and the contracting business, subject to statutory waiver situations. Section 7068.1 makes the qualifier responsible for supervision and control of construction operations, including technical and administrative decisions and checking workmanship.
How to apply
- Choose the licensed entity and qualifier.
- Generally, document at least four years of qualifying experience within the 10 years before applying. Approved training may count for up to three years; the former-qualifier and protected military-service timing exceptions described above may also apply.
- Submit the CSLB application and fee.
- Complete fingerprinting. Business and Professions Code section 7069 requires contractor-license applicants to furnish fingerprints for criminal-history checks.
- Take required trade and law-and-business exams unless CSLB approves a statutory waiver.
- After approval, pay the initial-license fee, file the contractor bond, and provide workers’ compensation proof or a valid exemption as applicable.
Verify the license is active before contracting.
Fees, bond, insurance, and renewal
The CSLB fee schedule lists a $450 original application fee for one classification, followed by a $200 initial-license fee for a sole owner or $350 for a non-sole-owner entity. Fingerprinting adds state and federal processing charges plus a Live Scan rolling fee set by the operator.
Business and Professions Code section 7071.6 requires a $25,000 contractor bond for an active license. The bond amount is not the premium; see contractor bonds vs. insurance.
For workers’ compensation, CSLB says a no-employee licensee may file a signed exemption only when no disqualifying condition applies. An exemption cannot be filed when the license is qualified by a Responsible Managing Employee (RME). CSLB’s mandatory-coverage list names C-8, C-20, C-22, C-39, and C-61/D-49, not C-36; however, a C-36 license using an RME still cannot use the ordinary no-employee exemption. Once the business employs someone subject to California workers’ compensation law, proof of coverage is required.
Business and Professions Code section 7140 says contractor licenses run on a two-year cycle. The official sources reviewed do not establish one fixed end-to-end application timeline; review, exam scheduling, fingerprinting, and issuance steps vary.
Reciprocity is not license transfer
An out-of-state plumbing license does not authorize California contracting. Business and Professions Code section 7065.4 allows CSLB to accept qualifications from a reciprocating state case by case when standards are comparable. The registrar may waive the trade exam if the applicant provides certification that the reciprocal license has been in good standing for the previous five years.
This is an exam-waiver path, not a license transfer. The applicant still must apply and satisfy remaining California requirements.