Thinking about getting your California contractor license but not sure which classification to choose? With 45 different CSLB classifications available, it’s one of the most important decisions you’ll make in your contracting career. Here’s how to pick the right one.
Understanding the Classification System
The CSLB divides contractor licenses into three main categories:
- A — General Engineering: Projects that require specialized engineering knowledge (highways, bridges, dams, utilities)
- B — General Building: Projects involving two or more unrelated building trades (residential and commercial construction)
- C — Specialty: 42 specific trade classifications (C-2 through C-61) for focused expertise
Key Factors in Choosing Your Classification
1. Your Work Experience
The CSLB requires 4 years of journey-level experience in the classification you’re applying for. Your experience must be verifiable — think about which trade you have the most documented time in. W-2s, tax returns, and employer certifications all count.
2. The Work You Want to Do
Match your license to the projects you want to bid on. A C-10 Electrical license won’t let you do plumbing work, and a C-36 Plumbing license won’t cover electrical. If you want to do full home remodels, you might need a B General Building license instead of a specialty.
3. Market Demand in Your Area
Some classifications have more demand than others in California:
- High demand: C-10 Electrical, C-20 HVAC, C-36 Plumbing, C-8 Concrete, B General Building
- Growing demand: C-46 Solar, C-27 Landscaping, C-33 Painting
- Specialized/niche: C-11 Elevator, C-57 Well Drilling, C-22 Asbestos Abatement
4. Exam Difficulty
Some trade exams have lower pass rates than others. According to CSLB data, classifications like C-10 Electrical and C-20 HVAC tend to have more challenging exams due to the technical depth of codes and regulations involved. That doesn’t mean you should avoid them — just plan for more study time.
Can You Hold Multiple Classifications?
Yes. Many contractors hold multiple C classifications or combine a B license with specialty classifications. Each additional classification requires passing the trade exam for that classification. You don’t need to retake the Law & Business exam.
B License vs. C License: Which Is Better?
It depends on your business model:
- B General Building lets you do projects involving two or more trades, but you must subcontract specialty work to licensed C contractors or self-perform if you hold the C classification too.
- C Specialty licenses focus on one trade but let you do all work within that scope without subcontracting.
Many successful contractors start with a C license in their core trade, then add a B license later as their business grows.
Next Steps
Once you’ve chosen your classification, the path to licensing involves:
- Verify your 4 years of experience
- Study for and pass the trade exam + Law & Business exam
- Submit your CSLB application ($450 fee)
- Get your $25,000 contractor license bond
- Obtain workers’ compensation insurance (or file an exemption)
Need help preparing for your exam? Browse our study guides and practice exams for all 45 classifications — we’re the only platform that covers every single CSLB classification.