California General Contractor License: What a B License Allows
Updated November 1, 2026
When people say "general contractor license" in California, they usually mean the B General Building license, which CSLB calls its most common classification. It does not let you take any construction job. It comes down to the two-trade rule.
The two-trade rule
A B contractor can take a prime contract or subcontract for:
- A framing or carpentry project on its own.
- A project with at least two other unrelated trades. Framing and carpentry do not count toward the two.
For anything else, you need the right specialty license. On a prime contract, you can instead subcontract the work to a properly licensed specialty contractor. On a subcontract, that second option is not available.
Examples from CSLB's rules
| Work | Can a B contractor take it? |
|---|---|
| Framing only | Yes |
| Roofing inside a home build, addition, or remodel | Yes, as part of the larger project |
| Standalone roofing contract | Must subcontract to a C-39 roofer |
| Fire protection (C-16) or well drilling (C-57) | Only with that license or a licensed subcontractor |
| Solar energy system on a structure | Yes. CSLB says installation counts as two or more unrelated trades |
| Asbestos abatement | Only with C-22, or an asbestos certification and registration with the state Division of Occupational Safety and Health, or a licensed subcontractor |
| Hazardous substance removal | Only with the Hazardous Substance Removal Certification |
A, B, or B-2?
- A General Engineering is for fixed works needing specialized engineering knowledge, such as highways, bridges, and pipelines.
- B General Building is for structures that shelter people, animals, or property.
- B-2 Residential Remodeling is narrower: nonstructural improvements to existing residential wood frame buildings, with at least three unrelated trades on one contract. It generally cannot install or extend electrical, plumbing, or mechanical systems, though it can install or replace fixtures as part of such a contract.
See the full classification list.
How to qualify
The qualifier needs four years of journeyman-level or higher experience in the classification within the last 10 years. The B is the only classification where owner-builder experience on your own property can count, with a separate project form and verifiable records such as permits. Most applicants then pass the Law and Business exam and the trade exam. Here are all the steps.
What it costs
CSLB charges a $450 application fee and an initial license fee of $200 for a sole owner or $350 for other entities. Exam fees go to PSI, and you also need a $25,000 contractor bond and workers' comp or an exemption.
Sources
- CSLB Fast Facts: What Jobs B General Building Can and Cannot Perform
- CSLB: Description of Classifications
- CSLB: Application for Original Contractor License
- CSLB: List of All CSLB Fees
This guide is general information, not legal advice. CSLB rules and fees change; always confirm on cslb.ca.gov.