Contractor Vetting

    How to Verify a Contractor's License, Insurance, and Bonding in California

    Verify a contractor's California license at cslb.ca.gov using their license number. This is free, takes under 2 minutes, and tells you everything about their legal standing. Never skip this step.

    Keystone Connect Advisory Team·Los Angeles, CA·Updated 2026

    Step-by-Step: How to Verify a California Contractor License

    Go to cslb.ca.gov → Click "Check a License" → Enter the contractor's license number or name → Review the result:

    FieldWhat to Look For
    License StatusMust say "Active" — not Expired, Suspended, or Revoked
    Expiration DateMust not expire during your project
    ClassificationMust match your project type (see below)
    Bond StatusMust say "Current"
    Workers' CompMust show current coverage or legitimate exemption
    Disciplinary ActionsAny citations, suspensions, or revocations are serious flags

    California Contractor License Classifications

    ClassificationPermitted Work
    B – General BuildingCombination of two or more trades; most renovation GCs hold this
    C-10 – ElectricalAll electrical work
    C-36 – PlumbingAll plumbing work
    C-20 – HVACHeating, ventilation, air conditioning
    C-29 – MasonryBrick, stone, concrete block
    C-33 – PaintingInterior and exterior painting
    C-54 – Ceramic & Mosaic TileTile installation

    How to Verify Insurance

    The right way: Ask the contractor for their insurance broker's contact information. Call the broker directly and request: a certificate of insurance naming you as Additional Insured on the general liability policy; confirmation that the policy is currently active through your project's expected completion; and the policy limits (minimum: $1M per occurrence / $2M aggregate).

    Do not accept: A certificate the contractor sends directly (it may be outdated); a verbal assurance; or a certificate that expires before your project completes.

    General Liability Insurance

    Covers damage to your property and third parties caused by the contractor's work. Minimum: $1,000,000 per occurrence / $2,000,000 aggregate. You should be named as Additional Insured.

    Workers' Compensation Insurance

    Required for any contractor with employees in California. Without it, injured workers may have a legal claim against your homeowner's policy or against you personally. If a contractor claims to have no employees (sole proprietor using independent subs), verify this claim carefully — misclassification is common.

    How Bonding Works in California

    California requires licensed contractors to be bonded through the CSLB. The contractor's license bond provides up to $25,000 for homeowners harmed by contractor fraud or misconduct. This is a baseline protection, not comprehensive coverage — the GL policy is where real financial protection comes from.

    Red Flags in Verification

    SituationWhat It Means
    License shows "Suspended"Cannot legally perform work in CA
    License shows "Revoked"Serious prior misconduct; do not hire
    License expires before project completionAsk them to renew first
    Workers' comp shows "Exempt"Must be a sole proprietor with no employees — verify
    Insurance certificate from contractor, not brokerVerify independently with broker
    Can't provide any insurance documentationDo not hire

    What Keystone Connect Does Differently

    Keystone Connect uses TrustLayer for real-time, ongoing insurance verification on every contractor in our network. Insurance is verified before any contractor introduction, and certificates are monitored for expiration — if a policy lapses, we know immediately. You never have to ask for, store, or verify an insurance certificate yourself.

    Want a second opinion before you sign anything?

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