Quick Answer: To find a licensed contractor in California, visit CSLB.ca.gov and search by license number, business name, or contractor name. A valid California contractor license requires a written exam, 4 years of experience, a bond ($15,000 minimum), and insurance. Always verify before signing a contract — working with an unlicensed contractor voids your insurance and makes you liable for worker injuries.
How to Verify a Contractor’s California License
California’s Contractors State License Board (CSLB) regulates over 300,000 licensed contractors in the state. Before hiring any contractor for work over $500 (labor + materials combined), California law requires them to hold a valid license. Here’s how to check.
Step 1: Go to CSLB.ca.gov
Visit CSLB.ca.gov → “Check a License” → “Verify a License.” You can search by: license number, business name, individual name, or city/county.
Step 2: Check These Key Fields
- License Status: Must say “Active.” Expired or suspended licenses are invalid
- License Classification: Verify it matches the work being done (B = General Building, C-2 = Insulation, C-8 = Concrete, C-27 = Landscaping, etc.)
- Bond Amount: Must show a contractor’s bond ($15,000 minimum)
- Workers’ Compensation: Verify insurance is on file (if the contractor has employees)
- Expiration Date: License must be current through your project completion date
- Disciplinary Actions: Scroll to the bottom — any citations, fines, or revocations appear here
What “B” General Building License Means
A Class B (General Building Contractor) license — like Quartz Construction’s CSLB #1003436 — allows the contractor to take on projects that combine multiple trades. A B-licensed contractor can manage framing, drywall, flooring, tile, cabinetry, and coordination of subcontractors (plumbing, electrical, HVAC). This is the license you want for kitchen remodels, bathroom remodels, room additions, and full home renovations.
Red Flags to Avoid
- Contractor can’t produce a license number immediately
- Asks for 50%+ deposit upfront (California law limits initial deposits to 10% or $1,000, whichever is less)
- No physical address — only a P.O. Box or cell phone
- Offers a price significantly lower than all other bids (unlicensed, uninsured, or planning to cut corners)
- Asks you to pull the permits yourself (licensed contractors pull their own permits)
- Insists on cash-only payment
Quartz Construction is CSLB #1003436 (Class B General Building), BBB A+ rated, 4.9⭐ with 65+ verified reviews. Verify our license on CSLB.ca.gov. Call (650) 749-7436.
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What Our Bay Area Clients Say
4.9 ★ average rating across Google, Yelp, and Houzz from 150+ Bay Area homeowners.
"Quartz Construction did an amazing job on our kitchen remodel. The team was professional, on time, and the results exceeded our expectations. Highly recommend to any Bay Area homeowner!"
— Michael T. |
"We hired them for a bathroom remodel in our San Jose home. From permitting to final walkthrough, everything was handled perfectly. The tile work is stunning. 5 stars without hesitation."
— Sarah L. |
"Just finished our ADU garage conversion. The project came in on budget and on schedule — rare in the Bay Area! The rental income already started. Could not be happier with Quartz Construction."
— David R. |
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Quartz Construction & Remodeling | CSLB #1003436 | Licensed, Bonded & Insured
Phone: (650) 749-7436
Address: 1777 Hamilton Ave #1080, San Jose, CA 95125
Hours: Mon–Sat 7am–7pm | Free Estimates
Service Area: San Jose, Santa Clara, Sunnyvale, Mountain View, Los Gatos & Bay Area
