If you’re planning to become a licensed contractor in California, passing the California State Contractors License Test is one of your biggest milestones. Whether you’re aiming for a General B license or specializing in trades like electrical or plumbing, understanding how the test works—and how to prepare for it—is key to your success.

This guide walks you through what’s on the CSLB exam, who needs it, how much it costs, and how to pass it on the first try.

What Is the California Contractor License Test?

The California State Contractors License Test is a two-part exam administered by the Contractors State License Board (CSLB). If you’re planning to take on projects where the labor and materials exceed $500, you’re legally required to be licensed by the state of California.

Who Needs to Take the CSLB Exam?

You must take the CSLB exam if you plan to:

• Operate as a general or specialty contractor in California
• Start or legitimize a construction business
• Qualify for government or large commercial projects
• Protect yourself legally and financially in the trade industry

What’s on the CSLB Exam?

Most applicants take two exams:

Law and Business Exam – Covers contractor law, employment law, business finances, contracts, safety codes, and legal responsibilities.

Trade Exam – Focuses on the hands-on knowledge and technical expertise for your specific classification, such as plumbing, HVAC, or general construction.

Some contractors may also be required to take an asbestos or hazardous substance certification exam depending on their scope of work.

CSLB Test Format and Structure

• Law and Business – 115 multiple choice questions
• Trade – Around 100–120 multiple choice questions depending on classification
• Time Limit – 3.5 hours per section
• Format – Computer-based, taken at a CSLB testing center
• Passing Score – Typically around 72%

Try our Sample Contractor’s License Exam Questions – California

How to Study for the California Contractors License Test

Here is what to study: CSLB Exam Study Guide – California General Contractor Exam

• CSLB Study Guides – The CSLB publishes free CA state contractor license exam study guides for all license types. Download them directly from cslb.ca.gov
• Prep Schools – Many contractors choose to enroll in license prep programs, which include live classes, flashcards, mock tests, and exam simulators.
• Online Practice Tests – Take multiple practice exams to get comfortable with the format and identify weak areas.
• Focus on Law & Safety – The Law and Business portion includes heavy coverage of OSHA standards, labor codes, liens, and contract law.
• Trade-Specific Prep – Your trade exam will focus on field-specific tasks. For example, Class B (general building) may cover framing, roofing, and codes, while C-10 (electrical) will involve wiring systems, diagrams, and NEC rules.

Costs to Take the CSLB Exam

• Application Fee – $450
• Initial License Fee – $200 (individual), $350 (corporation)
• Fingerprinting – $70 to $90
• Retest Fee – $100 per additional attempt

These fees are current as of 2025. Always check the CSLB site for the latest pricing.

What Happens If You Don’t Pass?

You can retake the test up to three times within 18 months of your application. If you fail, you’ll need to pay the $100 retest fee for each new attempt. You’ll receive a breakdown of your weak areas to focus your study efforts.

After You Pass – What’s Next?

Once you pass both exams, here’s what you’ll need to finalize your license:

• Get a Contractor’s Bond – Minimum $25,000 bond required
• Obtain Workers’ Comp – If you plan to hire employees
• Get Your License Number – Once everything is submitted and cleared
• Start Contracting – You’re now legally allowed to work on construction projects in California

Pro Tip

If you’re taking the Class C-27 Landscape Contractor exam, don’t just memorize materials—get familiar with California native plants, drip irrigation code requirements, slope grading, and soil types. These often show up in the test and can trip up even experienced landscapers.

Final Thoughts

Getting your California contractor’s license starts with passing the CSLB exam. It’s not easy—but with solid preparation, smart studying, and the right resources, you’ll set yourself up for long-term success in the trades. Whether you’re shifting careers or formalizing years of hands-on experience, the test is the gateway to bigger projects, better pay, and legal protection.