Contractor Red Flags: 20 Warning Signs California Homeowners Should Know

Updated October 23, 2026 · General information, not legal or professional advice.

Most California contractors are honest professionals, but the CSLB receives thousands of complaints each year, and many involve problems that homeowners could have spotted early. This guide lists common warning signs, explains the California rules behind them, and tells you what to do if a job goes wrong. It is general information, not legal advice.

License and identity red flags

1. No license number, or reluctance to share it. California requires a CSLB license for most construction work above a small-job threshold, and licensed contractors must include their license number on contracts, bids and advertising. Check it on the CSLB website. See our license check guide.
2. The license belongs to someone else. The name on the license should match the business on the contract. Using another contractor's license number is a common scam.
3. Wrong classification. A painting (C-33) contractor should not be rewiring your kitchen. Check that the classification fits the work.
4. Suspended or expired license. A suspended license often means a lapsed bond or workers' compensation policy.
5. Workers' comp exemption with a crew. If the license says the business has no employees but a crew shows up, you may face risk if a worker is injured.
6. Unregistered salesperson. In-home salespeople must be registered with CSLB as Home Improvement Salespersons.

Money red flags

7. Large down payment demands. California limits the down payment a contractor can request on home improvement jobs. A demand for more than the legal limit is itself a warning sign. CSLB's consumer pages explain the rule.
8. Cash only. Paying in cash leaves you without a record. Pay by check or card.
9. Payments ahead of work. Progress payments should match work completed and materials delivered, not run ahead of them.
10. "Special price if you sign today." High-pressure, today-only pricing leaves no time to check licenses or compare bids.
11. A bid far below the others. It may leave out permits, demolition or finish work, or signal plans for change orders later.

Contract and permit red flags

12. No written contract. Home improvement contracts in California must be in writing and include required details and notices.
13. No notice of your right to cancel. Many in-home contracts must include a notice of your right to cancel within three business days, or five for homeowners aged 65 or older.
14. Vague scope. "Remodel kitchen" is not a scope of work. The contract should list materials, brands or allowances and who does what.
15. "You don't need a permit." Or a request that you pull an owner-builder permit for work the contractor will do. Owner-builder permits make you legally responsible as the builder. See our permit guide.
16. Verbal change orders. California requires change orders on home improvement contracts to be in writing and signed.

Behavior red flags

17. Door-to-door "leftover materials" offers. A classic scam, especially for driveways and roofs.
18. Unsolicited storm or fire damage inspections. After disasters, out-of-area crews appear quickly. Contracting without a license in a declared emergency area is a felony in California. Read hiring a roofer for storm-season tips.
19. No physical address or only a cell number. You need a way to reach the business if problems arise.
20. Bad communication before you sign. If calls go unanswered while they are trying to win your business, it rarely improves later.

Elder fraud

Older homeowners are frequent targets of home repair scams. California provides extra protection, including a longer cancellation period for homeowners aged 65 and older. Family members can help by checking licenses and reviewing contracts. Suspected elder financial abuse can be reported to your county's Adult Protective Services.

How to protect yourself

• Get at least three written bids based on the same scope.
• Check every license, including subcontractors, before you sign and before major payments.
• Read the whole contract and keep a copy.
• Get conditional and unconditional lien releases as you pay.
• Make sure permits are pulled and finaled.
• Keep records: photos, texts, emails, invoices and receipts.

If something goes wrong

1. Talk to the contractor first, in writing. Describe the problem and give a reasonable deadline to fix it.
2. File a complaint with CSLB. The board investigates complaints against licensed and unlicensed contractors and offers mediation and arbitration programs in some cases. Complaints can be filed online at cslb.ca.gov.
3. Consider the contractor's bond. A claim against the bond may provide limited recovery.
4. Small claims court. The California Courts Self-Help Guide explains small claims limits and procedures.
5. Get legal advice for large losses or if a lien has been recorded against your home.

Find licensed contractors

Every contractor in our directory links to its CSLB license record. Browse general contractors, roofers, painters, stucco contractors and pool builders in Ventura, Oxnard, Simi Valley, Santa Barbara, Santa Maria and more. Planning a bigger project? Start with ADU basics or our kitchen remodel timeline.

Green flags: signs of a good contractor

Red flags are only half the picture. Good contractors tend to share some habits. They give you their license number up front and expect you to check it. They visit the site before giving a detailed written bid. They explain trade-offs between materials honestly and tell you when something you want is not a good idea. They explain which permits are needed and include permit work in the schedule. They provide references from recent jobs similar to yours and are happy for you to call them. Their contract is complete, readable and includes the required California notices. They tie payments to progress, provide lien releases without being asked, and put every change in a written change order. They communicate on a predictable schedule and tell you about problems early rather than after the fact.

Checking references properly

When you call references, ask specific questions: Was the job finished on time? Were there change orders, and were they explained? Did the crew clean up each day? How were problems handled? Would you hire them again? If possible, look at a finished project in person. A reference from several years ago tells you less than a recent one, because crews and ownership change.

Online reviews

Reviews can help, but read them critically. Look for detail about the type of project you are planning, and pay attention to how the business responds to complaints. Use reviews alongside, not instead of, the CSLB license record.

Quick checklist before you sign

• License active, name matches, classification fits the work, bond and workers' comp current.
• Salesperson registered with CSLB if someone other than the owner sold the job.
• Written contract with scope, dates, payment schedule, and required notices, including the right to cancel.
• Down payment within the legal limit and payments tied to completed work.
• Permits included in scope and schedule; contractor pulls them in their own name.
• References checked, recent and similar in scope.
• Plan in place for lien releases with each payment.
• Everything in writing, including every change order.

If you can tick every box, you have done more than most homeowners do, and you have greatly reduced the chance of a costly dispute.

Bookmark this page and share it with relatives, especially older family members who may be approached by door-to-door contractors.

Official sources: CSLB consumer resources; California Courts Self-Help Guide; California Department of Social Services, Adult Protective Services.

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