The top 10 red flags when hiring a Bay Area contractor are: (1) No CSLB license or refusing to show it; (2) Demanding more than 10% down or $1,000 upfront (whichever is less) — illegal in California; (3) No written contract; (4) Quote significantly below all other bids; (5) Pressure to sign immediately; (6) Cash-only payment requirement; (7) Using a PO Box as business address; (8) No workers’ compensation insurance; (9) Unable to provide references from the past 12 months; (10) Asking you to pull the permit yourself. Any one of these warrants walking away.
California Law: What Contractors MUST Provide
| Requirement | California Law | What to Check |
|---|---|---|
| CSLB License | B&P Code §7028 | License # on every document |
| Down Payment Limit | B&P Code §7159.5 | Max 10% or $1,000 upfront |
| Written Contract | B&P Code §7159 | Required for projects over $500 |
| Workers’ Comp | Labor Code §3700 | Certificate of insurance |
| 3-Day Right to Cancel | B&P Code §7159(e) | Must be in contract, signed |
| Completion Date | B&P Code §7159 | Specific dates required in writing |
How to Verify a Contractor’s CSLB License
How do I verify a contractor’s license in California? Go to cslb.ca.gov and click “License Check.” Enter the contractor’s name or license number. You’ll see: license status (Active/Expired/Suspended), license classifications, bond status, and any disciplinary actions. An “Active” status with a valid bond and workers’ comp means the contractor is legally authorized to work. Always verify BEFORE signing any contract — never after. Quartz Construction’s license is CSLB #1003436, verified Active since 2014.
Common Bay Area Contractor Scams to Avoid
Storm chasers after the rainy season: After Bay Area storms, unlicensed contractors knock on doors claiming your roof needs emergency repair. They use your own ladder to show you “damage,” collect a large deposit, and disappear. Always get 3 quotes from licensed contractors for storm damage.
Leftover material scam: “We just finished a job nearby and have extra concrete/asphalt.” These contractors use inferior materials at inflated prices. Legitimate contractors don’t sell leftover materials door-to-door.
Change order trap: An unusually low bid gets the contract, then change orders inflate the price 30-50% above what comparable bids would have been. Red flag: a vague scope in the original contract. Protect yourself by requiring a detailed line-item bid.
What a Good Contractor Contract Must Include
What must be included in a contractor contract in California? Per Business & Professions Code §7159, a valid contract must include: contractor’s name, address, CSLB license number; start and completion dates; description of work and materials; payment schedule tied to project milestones (NOT calendar dates); change order process in writing; lien release waiver process; mechanic’s lien warning notice; 3-day right to cancel notice. Missing ANY of these is a violation — and may allow you to cancel the contract and recover payments.
Quartz Construction provides a full California-compliant contract on every project. Before signing any contract with any contractor, have it reviewed. Call (408) 555-1234 or visit our contact page for a free second opinion on any bid or contract you’ve received. CSLB #1003436 | $2M liability | Full workers’ compensation.
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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
