How to Check a Contractor’s License in California: Step-by-Step Homeowner Guide

If you’re planning a renovation, electrical upgrade, or CCTV installation in California, one of the most important things you can do is verify your contractor’s license before any work begins. Checking a contractor’s license ensures you’re working with a qualified, legitimate professional — not someone operating without proper credentials. This simple step can save you time, money, and stress in the long run. Working with licensed low voltage professionals in California ensures your project complies with state requirements and safety standards.

Why Checking a Contractor’s License Matters

California has strict laws to protect consumers from unqualified or fraudulent contractors. The California Contractors State License Board (CSLB) oversees licensing for professionals in construction, electrical, plumbing, and other trades.

A valid license means the contractor has:

Passed trade and law exams
Met insurance and bonding requirements
Proven experience in their field
Agreed to follow state safety and labor regulations

When you verify a license, you can see the contractor’s business details, bond information, and whether there have been complaints or disciplinary actions.

Step-by-Step: How to Check a Contractor’s License in California

1. Visit the Official CSLB Website

Go to the California Contractors State License Board (CSLB) website at www.cslb.ca.gov. This is the official and most reliable source for license verification.

2. Use the “Check a License” Tool

Once on the site, click on “Check a License.” You can search by:

License number
Business name
Personal name (owner or qualifier)

This search provides real-time licensing information directly from CSLB’s database.

3. Review License Details

When results appear, you’ll see important details like:

License status (active, expired, suspended)
Classification (e.g., C-7 Low Voltage Systems, C-10 Electrical, B General Contractor)
Bonding and insurance information
Workers’ compensation coverage (if applicable)
Business address and contact info

Be cautious if a license shows as “expired,” “inactive,” or “suspended.” Work should never begin until the issue is resolved.

4. Check for Disciplinary Actions or Complaints

Scroll down to see if there are any citations, disciplinary actions, or unresolved complaints. This can reveal whether the contractor has had legal or ethical issues in the past.

5. Verify Company and Owner Match

Make sure the business name on the CSLB record matches the company or person you’re hiring. Some unlicensed operators use legitimate license numbers that belong to other companies. Always confirm that names, addresses, and contact details align.

6. Contact CSLB for Confirmation (Optional)

If something seems off, call CSLB directly at 1-800-321-CSLB (2752). They can verify the information or explain details not shown online.

Common License Classifications in California

Here are a few examples of license types you might encounter when hiring for technical or construction work:

C-7: Low Voltage Systems Contractor – Installs CCTV, networking, and alarm systems
C-10: Electrical Contractor – Handles electrical wiring and panels
B: General Building Contractor – Oversees residential and commercial construction
C-20: HVAC Contractor – Installs and services heating and cooling systems
C-39: Roofing Contractor – Specializes in roofing installations and repairs

Understanding these classifications helps ensure you’re hiring the right professional for your project. Before hiring anyone, it’s important to understand the rules — find out whether California requires a low voltage license for your type of project.

Red Flags to Watch Out For

Be wary of contractors who:

Ask for large upfront payments (over 10% or $1,000, whichever is less)
Refuse to provide a license number
Can’t show proof of insurance or bonding
Pressure you to make quick decisions
Only accept cash payments

These are signs that a contractor might not be properly licensed or trustworthy.

Why Licensed Contractors Are Worth It

Hiring a licensed contractor protects you legally and financially. If something goes wrong — such as property damage or incomplete work — you have legal recourse through CSLB. Licensed professionals are also more likely to follow safety standards, provide warranties, and maintain liability coverage.

In California, doing business with an unlicensed contractor is risky and could even void your homeowner’s insurance.

Stay Protected — Verify Before You Hire

Before signing any agreement or paying a deposit, take five minutes to verify the contractor’s license on the CSLB website. It’s fast, free, and can help you avoid scams or unqualified workers. If you’re unsure about a contractor’s scope, here’s a guide explaining whether general contractors can perform electrical work in California.

Whether you’re hiring for CCTV installation, electrical wiring, or home renovation, always make sure your contractor is properly licensed and insured in California.

Visit www.cslb.ca.gov today to check your contractor’s credentials and protect your investment.