How to Verify a Contractor Is Licensed and Insured Before Signing

Why a License Alone Won't Protect Your Altadena Build

A valid contractor's license tells you one thing and one thing only: the contractor met the state's requirements to hold a license. It tells you nothing about whether that contractor carries insurance today — and regulators are blunt about this. As the New Hampshire Insurance Department puts it, "a valid license doesn't guarantee they're properly insured," and licensing and insurance are entirely separate matters that must be verified independently.

The same gap applies to paperwork. A printed certificate of insurance is a summary document, not a guarantee — policies can be canceled or lapse between the day the certificate is printed and the day work begins. That's why regulators warn homeowners to never accept a printed certificate at face value and to request confirmation directly from the insurer instead.

For an Eaton Fire rebuild on a hillside lot, the exposure is real. Crews work on slopes, heavy materials move across your property daily, and the project timeline stretches across many months. If your contractor lacks workers' compensation and a worker is injured on your land, you could be responsible for medical expenses, lost wages, and legal costs. Worse, many standard homeowner policies exclude or limit coverage for damage caused by contractors — meaning your own insurer may not step in when you need it most.

The financial scale of bad actors makes this diligence urgent. Home improvement fraud costs consumers over $3 billion annually according to an FTC figure, and post-disaster rebuild zones are precisely where underinsured operators tend to show up. A contractor's license number on a bid means little if the coverage behind it has quietly expired.

Before you sign anything, understand what a standard license lookup does not tell you:

• Whether general liability coverage is active — or lapsed since the certificate was printed
• Whether the workers' comp account is current and paid-to-date, not just nominally open
• Whether subcontractors carry coverage equal to or greater than the primary contractor's
• Whether you are named as an additional insured with written cancellation notice

That last item matters more than most Altadena homeowners realize. An additional insured endorsement ensures the contractor's insurance responds first and provides legal defense, and a written 30-day cancellation notice protects your coverage for the full length of the project. Regulators note that verbal assurances that a contractor is "insured" are not sufficient — you need the endorsement in writing.

At Altadena Custom Home Builder, we treat these verification steps as baseline diligence for any ground-up home or tear-down rebuild, not optional extras. A license number is where the conversation starts; it is never where it ends.

The Verification Framework: Four Checks Most Owners Skip

Most homeowners never actually verify a contractor's insurance — they accept a folder of paperwork and a handshake. The New Hampshire Insurance Department puts it bluntly: verbal assurances that a contractor is "insured" are not sufficient, and a printed certificate can change if a policy is canceled or allowed to lapse before work even begins. That's why a structured, four-check verification process matters — especially for high-stakes projects like a ground-up custom home or an Eaton Fire rebuild in Altadena.

Check 1: Confirm the license with the issuing authority — not the contractor. A contractor can show you a license number that is expired, suspended, or simply wrong. Use the official state lookup tool and confirm the status is active, the expiration date extends through your project timeline, and no disciplinary actions exist. In California, that means checking the CSLB's record directly. JMB Builders LLC, the licensed general contractor featured in our guide, holds CSLB license #1103479 — a number any homeowner can and should confirm on the state board's site rather than taking anyone's word for it.

Check 2: Call the insurer directly. A certificate of insurance is a helpful summary, not a guarantee. Policies can lapse between the time a certificate is printed and the day work begins, so request the certificate, then phone the insurer or agent listed on it to confirm the policy is active and adequate. The NH Insurance Department also recommends confirming coverage minimums: $1 million per occurrence and $2 million aggregate for general liability, plus $1 million in commercial auto liability.

Check 3: Request an additional insured endorsement with 30-day cancellation notice. This is the step most owners never ask for. Being named as an additional insured on the contractor's general liability policy ensures the contractor's insurance responds first and provides legal defense if something goes wrong on your property. Pair it with a written commitment to 30 days' notice if the policy is canceled or materially changed mid-project — otherwise coverage could quietly disappear while your build is half-finished.

Check 4: Verify subcontractors separately. Your general contractor's credentials don't cover the electricians, plumbers, and other trades on site. Each subcontractor should hold the appropriate trade license, and per regulatory guidance, should carry coverage equal to or greater than the primary contractor's. Ask for the license numbers and verify each one yourself.

The stakes are real: if an uninsured worker is injured on your property, you could be responsible for medical expenses, lost wages, and legal costs — and many homeowners' policies exclude or limit damage caused by contractors. Keep copies of every certificate, endorsement, and confirmation email in one file. If a contractor balks at any of these four checks, treat it as a red flag, not a negotiation.

Planning a custom build, tear-down, or fire rebuild in Altadena? Our free build consultation walks you through contractor vetting, permitting with LA County, and what to expect on hillside and SB 9 lots — before you sign anything.

Verifying Contractors in California: The CSLB Check

In California, the verification process starts with one number: the contractor's CSLB license. Every legitimate contractor in the state has one, and if a builder hesitates to share it, that hesitation is itself an answer.

Ask for the license number, then look it up yourself through the Contractors State License Board's public license lookup — never rely on the contractor's word alone. Regulators consistently warn that a valid license doesn't guarantee proper insurance, and that licensing and insurance are separate matters that must be checked independently.

When the record comes up, confirm four things:

• Status is "Active" — an expired license functions the same as no license from a legal standpoint, according to licensing experts.
• The classification matches your project — a custom home or rebuild requires a general contractor classification (B), not a specialty trade license.
• The expiration date extends past your expected completion date, since hillside builds and fire rebuilds can run long.
• The bond and workers' comp status show as current and paid-to-date — an active policy behind on premiums can leave you liable for injuries on your property.

The workers' comp point deserves emphasis. If a worker is injured on your lot and the contractor lacks coverage, the homeowner can be responsible for medical expenses, lost wages, and legal costs — and many standard homeowners' policies exclude or limit contractor-caused damage. For an Eaton Fire rebuild on a slope lot, that's an exposure you cannot carry yourself.

Here's what a transparent contractor looks like in practice. JMB Builders LLC, an Altadena-based general builder we feature on this site (disclosed paid placement), publishes its CSLB license number — #1103479 — openly, and its custom home, ADU, and rebuild work is documented on jmb-builders.com. You can take that number, run it through the state lookup, and independently confirm the classification, bond, and workers' comp status before you ever pick up the phone.

That's the standard to hold every builder to, whether you found them here or through a neighbor's referral. If a contractor's documentation isn't verifiable through the state board and its insurer, no bid — however attractive — is worth the risk. Home improvement fraud costs consumers over $3 billion annually, and consumer protection agencies recommend never paying more than a quarter to a third of total cost upfront, precisely because unverified contractors are where losses concentrate.

Ready to put this checklist to work on your lot? Altadena Custom Home Builder offers a free build consultation to walk through your ground-up, tear-down, or rebuild project — bring your questions, and we'll help you vet every builder you're considering.

Red Flags and Your Pre-Signing Checklist

Even careful homeowners get caught by the same handful of warning signs — and they almost always surface before the contract is signed, if you know what to watch for.

Refusal to provide proof of insurance is the clearest red flag across every source. As the New Hampshire Insurance Department puts it, verbal assurances that a contractor is "insured" are not sufficient — a contractor who won't produce documentation is telling you something. The same source warns against contractors who ask the homeowner to pull permits in their own name, which shifts legal responsibility for code compliance onto you.

Be equally wary of anyone who suggests insurance or permits are unnecessary. As one licensing guide notes, if a contractor suggests skipping permits, that is a major red flag. And watch bids that seem too good to be true: the Georgia Attorney General's consumer office cautions that "cheaper is not necessarily better." Home improvement fraud costs consumers over $3 billion annually — low bids are often the bait.

Before you sign anything, run through this checklist:

• Verify the license with the issuing authority — confirm it is active, matches your project type, and won't expire mid-project.
• Confirm insurance with the insurer — a printed certificate is a summary, not a guarantee; policies can lapse between issuance and project start.
• Secure an additional insured endorsement and request written notice (ideally 30 days) if the policy is canceled or materially changed.
• Check subcontractors — each trade sub needs the appropriate license and coverage equal to or greater than the primary contractor's.
• Confirm workers' comp is active and paid-to-date, and keep records of every certificate, endorsement, and correspondence.

The stakes are real: without workers' compensation coverage, an injured worker's medical expenses, lost wages, and legal costs can fall on you — and many standard homeowners' policies exclude or limit contractor-caused damage.

If you're planning a ground-up custom home, tear-down, or rebuild in Altadena, Altadena Custom Home Builder can help you pressure-test contractors before you commit. Book a free build consultation and bring your bids — we'll help you make sure the builder you choose is one you can verify.