California’s contractor licensing laws are designed to protect consumers, but they also protect you as a licensed contractor. Understanding these laws isn’t just about passing the Law & Business exam — it’s about running a compliant, profitable business. Here are the 10 laws every California contractor must know in 2026.
1. The $500 Written Contract Rule (B&P Code §7159)
Any home improvement project over $500 requires a written contract. The contract must include your license number, project description, total price, payment schedule, start and completion dates, and a 3-day right-to-cancel notice. Failing to provide a written contract is one of the most common CSLB violations.
2. Down Payment Limits (B&P Code §7159.5)
You cannot collect more than $1,000 or 10% of the contract price (whichever is less) as a down payment for home improvement work. Progress payments must be tied to work actually completed. Violating this is a misdemeanor.
3. The $25,000 Contractor Bond (B&P Code §7071.6)
Every licensed contractor must maintain a $25,000 surety bond. This protects consumers — if you violate licensing laws, consumers can make claims against your bond. Annual premiums typically run $100-$500 depending on your credit score.
4. Workers’ Compensation Insurance (Labor Code §3700)
If you have employees, you must carry workers’ compensation insurance. Period. Sole proprietors with no employees can file a Certificate of Exemption with the CSLB. Operating without workers’ comp when required triggers automatic license suspension.
5. The 20-Day Preliminary Notice (Civil Code §8200)
Subcontractors and material suppliers must serve a 20-day preliminary notice to preserve mechanics’ lien rights. Even if you’re the prime contractor, understanding this law protects you from unexpected lien claims on your projects.
6. License Renewal Every 2 Years (B&P Code §7076)
Your contractor license must be renewed every 2 years. Late renewal incurs penalty fees. If your license expires, you cannot legally contract or bid on work until it’s renewed. Set a calendar reminder 60 days before expiration.
7. Contracting Without a License Penalties (B&P Code §7028)
Operating without a valid license is a misdemeanor. First offense: up to $15,000 fine and/or 6 months jail. Second offense: up to $30,000 fine and/or 1 year. Plus, under B&P Code §7031, an unlicensed contractor cannot sue to collect payment for work performed.
8. Change Order Requirements
Any changes to the original contract scope must be documented in a written change order signed by both parties before the extra work begins. Verbal change orders are not enforceable. Include the additional cost, revised timeline, and detailed scope description.
9. Prevailing Wage on Public Works (Labor Code §1720)
All public works projects exceeding $1,000 require prevailing wages. You must register with the Department of Industrial Relations (DIR), submit certified payroll records, and comply with apprenticeship requirements. Non-compliance carries serious penalties.
10. The 4-Year CSLB Complaint Statute (B&P Code §7091.1)
Consumers have 4 years from the date of the alleged violation to file a CSLB complaint. The CSLB can investigate, issue citations with civil penalties up to $5,000 per violation, and take disciplinary action including license suspension or revocation.
Bottom Line
These 10 laws form the foundation of legal compliance for California contractors. They’re also heavily tested on the CSLB Law & Business exam. If you’re preparing for your exam, our free Law & Business study guide (included with every classification purchase) covers all of these in detail with practice questions.
Questions about contractor law? Contact us or chat with Maria, our licensing advisor, using the chat widget on this page.