Every contractor applying for a California license must pass the CSLB Law & Business exam — no exceptions. Whether you are pursuing a B General Building, C-10 Electrical, C-36 Plumbing, or any other classification, this exam tests your knowledge of California contracting law, business practices, and safety regulations. This free study guide covers the key topics, study strategies, and tips you need to pass in 2026.
Why the Law & Business Exam Matters
The CSLB requires this exam because running a contracting business involves far more than technical skill. You need to understand contracts, lien law, employee safety regulations, insurance requirements, and financial management. Many experienced tradespeople fail this exam because they underestimate its difficulty — don’t make that mistake.
Exam Format
- Questions: approximately 115 multiple-choice
- Time limit: 2.5 hours
- Passing score: 72%
- Format: computer-based at PSI testing centers
- Open-book: No — this exam is closed-book
Unlike most trade exams, the Law & Business exam is closed-book. You must know the material — you cannot look anything up during the test.
Key Topics Covered
1. Business & Professions Code (25–30%)
This is the core of the exam. The California Business & Professions Code governs contractor licensing. Key areas include:
- Licensing requirements: who needs a license, exemptions, license classifications
- Advertising rules: license number in all ads, prohibited claims
- Disciplinary actions: grounds for suspension or revocation, complaint process
- Home Improvement Contracts: three-day right to cancel, contract requirements, down payment limits (10% or ,000, whichever is less)
- Penalties: contracting without a license (misdemeanor, up to ,000 fine)
2. Mechanics Lien Law (15–20%)
Mechanics liens protect contractors, subcontractors, and suppliers who are not paid. Exam questions focus on:
- Preliminary notice: must be sent within 20 days of first furnishing labor or materials
- Mechanics lien deadlines: 90 days after completion for direct contractors, 90 days for subcontractors
- Stop-payment notices: when and how to serve them on construction lenders
- Payment bond claims: requirements for public works projects
- Lien release forms: conditional vs. unconditional, progress vs. final
3. OSHA and Cal/OSHA Safety (10–15%)
Safety regulations are tested heavily. Know:
- Cal/OSHA requirements: Injury and Illness Prevention Program (IIPP), required for all employers
- Fall protection: required at 6 feet in construction
- Excavation safety: shoring, sloping, and benching requirements for trenches over 5 feet
- Hazard communication: Safety Data Sheets (SDS), labeling, employee training
- Penalties: serious violations, willful violations, repeat violations
4. Contract Law (10–15%)
Understand the basics of construction contracts:
- Elements of a valid contract (offer, acceptance, consideration, legal purpose)
- Types of contracts: fixed-price (lump sum), cost-plus, time-and-materials
- Change order procedures and documentation
- Breach of contract and remedies
- Arbitration and mediation clauses
5. Insurance and Bonding (10–15%)
- Contractor bond: ,000 required, protects consumers
- Workers’ compensation: required if you have employees, penalties for non-compliance
- General liability insurance: not required by CSLB but essential for business
- Bond of qualifying individual: ,500, required when the license qualifier is someone other than the sole owner
6. Financial Management and Estimating (10–15%)
- Markup and profit margin calculations
- Job costing and overhead allocation
- Basic bookkeeping and accounting principles
- Payroll taxes and employee classification (W-2 vs. 1099)
- Bid preparation and estimating methods
Study Tips That Work
Memorize the Numbers
The Law & Business exam loves specific numbers and deadlines. Create flashcards for:
- Down payment limit: 10% or ,000 (whichever is less)
- Preliminary notice: 20 days
- Mechanics lien: 90 days after completion
- Right to cancel: 3 business days
- License threshold: (projects under don’t require a license)
- Contractor bond: ,000
Focus on Lien Law
Mechanics lien questions are some of the most detailed on the exam. Understand the timeline from preliminary notice through lien recording and enforcement. Draw it out as a timeline and review it daily.
Take Practice Tests
Because the exam is closed-book, repetition is essential. Our Law & Business exam prep course includes hundreds of practice questions covering every topic area, along with detailed explanations that teach you the reasoning behind each answer.
Don’t Skip Safety
OSHA questions are often straightforward if you know the regulations. Memorize the key thresholds (fall protection at 6 feet, trench shoring at 5 feet) and understand the IIPP requirement.
Common Mistakes to Avoid
- Studying only the trade exam: Many candidates spend all their time on trade material and run out of time for Law & Business.
- Guessing on lien law: The deadlines and procedures are specific — there is no room for approximation.
- Ignoring financial questions: Markup calculations and employee classification questions are straightforward points if you prepare.
Get Started Today
The Law & Business exam is passable with focused preparation. Start early, use flashcards for key numbers, and practice with realistic questions. Access our Law & Business exam prep course to study with confidence. And if you need help with the full licensing process, our license setup service is here to guide you every step of the way.