If you’re planning to take the CSLB exam, you already know there are two tests: the trade exam for your specific classification and the Law & Business exam that every contractor must pass. But many first-time test takers are surprised by how different these two exams feel. Here’s what to expect.
The Trade Exam
Your trade exam tests knowledge specific to your classification — whether that’s electrical (C-10), plumbing (C-36), HVAC (C-20), or any of the 43 other specialties. Key facts:
- Questions: 100 multiple choice
- Time limit: 2.5 hours (150 minutes)
- Passing score: 72%
- Content: Codes & standards, safety, trade knowledge specific to your classification
The trade exam is open-book for some classifications — you can bring approved reference materials. Check the CSLB website for your specific classification’s reference list.
The Law & Business Exam
Every contractor takes the same Law & Business exam regardless of classification. This test covers:
- Questions: 115 multiple choice
- Time limit: 2.5 hours (150 minutes)
- Passing score: 72%
- Content: California contractor law, business management, safety regulations, project management, estimating
The Law & Business exam is closed-book. No reference materials allowed.
Which One Should You Take First?
You can take them in any order, and they don’t need to be taken on the same day. Most successful candidates recommend:
- Take the trade exam first — you likely already have 4+ years of hands-on experience in your trade, so this builds on existing knowledge
- Then tackle Law & Business — this requires more memorization of specific code sections, dollar amounts, and timelines that may be less familiar
What If You Fail One?
If you fail either exam, you can retake it after 18 days. You only need to retake the exam you failed — passing scores on the other exam remain valid for 18 months. There’s no limit on retakes, but each attempt costs a fee.
Study Strategy
Our exam prep courses include both a classification-specific study guide AND a free Law & Business guide. We recommend studying for 15-20 hours per exam — that’s about 2-3 weeks at 1-2 hours per day.