Los Angeles has thousands of home service contractors, and the quality varies enormously. California’s licensing system provides real protection for homeowners — but only if you use it. This guide shows you how to vet any contractor before letting them into your home or handing over a deposit.
The CSLB: Your First Stop
The California Contractors State License Board (CSLB) licenses and regulates all construction trades in the state, including plumbers, electricians, HVAC technicians, and general contractors. Checking a contractor’s license takes two minutes and tells you:
- Whether the license is current and active
- The license type (C-36 is plumbing, C-10 is electrical, C-20 is HVAC)
- Whether any disciplinary actions have been filed
- Worker’s compensation insurance status
Visit cslb.ca.gov and use the “Check a License” tool. Any contractor who can’t provide a license number or whose license doesn’t match their name should be disqualified immediately.
Verifying Insurance
Licensing alone isn’t enough. Before work begins, ask for certificates of insurance showing:
- General liability insurance: Covers damage to your property during the work
- Worker’s compensation insurance: Protects you from liability if a worker is injured on your property
If a contractor can’t provide these certificates, you assume the financial risk for any accidents or property damage during the job.
Getting Multiple Estimates
For any job over $1,000, get at least three written estimates. A wide spread in pricing often indicates either an overpriced incumbent or a dangerously low bid from someone cutting corners on materials or labor. The middle estimate — from a licensed, insured contractor with good reviews — is usually the right choice.
Be wary of contractors who:
- Demand large cash deposits upfront (more than 10% or $1,000, whichever is less, is illegal in California)
- Can only start “immediately” with no written contract
- Offer to do the job “off the books” to avoid permits
Understanding Permits
Most significant home repairs in LA require permits from the city or county. Plumbing replacements, electrical panel upgrades, HVAC installations, and structural work all typically require permits. Work done without permits creates problems when you sell — and can void your homeowner’s insurance coverage. Reputable contractors pull their own permits and include permit costs in their estimates.
Reading Reviews
Google reviews, Yelp, and the Better Business Bureau all provide useful feedback on local contractors. Look for:
- A pattern of responsiveness and communication across reviews
- Mentions of showing up on time and staying in scope
- How the contractor responded to negative reviews (reveals character)
Red Flags to Watch For
- No physical address or only a P.O. Box
- Unlicensed with a “handyman” qualification for work requiring a contractor license
- Pressure to decide immediately or lose the price
- Asks you to sign over insurance payments before work is complete
For plumbing-specific guidance on what to look for in a licensed plumber, our Home Plumbing Guide for LA Residents includes a detailed contractor vetting section with LA-specific considerations.