Check a Contractor's License in California Before Any Deposit

Why Altadena Homeowners Are a Target Right Now

If a contractor knocks on your door in Altadena promising a fast ADU or rebuild, the LA County District Attorney's Office has a message for you: the person holding that bid might be the target of a sting operation. In the Palisades Fire disaster zone, investigators posed as homeowners seeking bids for — of all things — an accessory dwelling unit and demolition work. The bait worked: six unlicensed contractors were charged with felony contracting without a license during a natural disaster, after placing roughly $1.27 million in illegal bids.

That sting was the second of its kind. In December 2025, five unlicensed contractors were charged in the Eaton Fire zone — the same disaster area that covers much of Altadena. With more than 16,000 homes and structures destroyed by the LA County wildfires, regulators know the rebuild is a magnet for operators who can't legally pull a permit.

District Attorney Nathan Hochman put the stakes plainly: "Hiring an unlicensed contractor is never a good deal, leaving you at risk of illegal down payments, fraud, unsafe construction and an inability to sell your home down the line." CSLB Registrar David Fogt added that protecting wildfire survivors from unlicensed contractors as they rebuild is a top priority for the board.

Why Altadena homeowners are especially vulnerable right now:

• Rebuild demand is enormous, and insurance money creates a pool of homeowners under pressure to hire fast.
• Contractor fraud, unfinished work, and insurance disputes have risen since late 2024, with "deposit and disappear" schemes among the most common patterns.
• Unlicensed or unpermitted work typically isn't covered by homeowners insurance — and can block a future sale entirely.
• Penalties are steep on the contractor side too: unlicensed contracting in a declared disaster area carries up to three years in state prison and a $10,000 fine.

The uncomfortable truth is that rushing is the biggest mistake homeowners make — the exact behavior disaster zones encourage. Many victims, as insurance industry guidance notes, discover the fraud only when the city denies a permit, an insurer rejects a claim, or safety hazards surface months later.

That's why Altadena ADU Builder's first piece of advice for any Eaton Fire rebuild or backyard ADU project is the same: verify the CSLB license before a dollar changes hands. It takes minutes, and it's the single highest-leverage protection you have.

Why a License Number on a Bid Isn't Proof

Seeing "CSLB #123456" printed neatly at the top of a bid feels reassuring — but it shouldn't. That number could belong to someone else entirely, and in California, copying one is a crime.

Here's the uncomfortable truth: the CSLB's license database is public, which means anyone can look up an active number and paste it onto a bid. That's not hypothetical — one documented case involved an unlicensed roofer who lifted a legitimate number and attached it to a $25,000 bid. The homeowner had no way to know unless they verified it themselves.

Fraudulent use of a license number is what California calls a "wobbler" offense under Business & Professions Code 7027.3 — prosecutable as either a misdemeanor or a felony, carrying up to 3 years in state prison and a $10,000 fine, with mandatory restitution either way (per legal analysis of the statute). That severity tells you how seriously the state takes it.

Even a genuinely valid number can mislead you in two ways. The person handing you the bid may not be the person the license actually belongs to. And a licensed contractor can still commit fraud by using someone else's number to bid work outside their own classification — so an active "C-20" HVAC license doesn't authorize a custom home or ADU build.

The licensing threshold itself is lower than most homeowners assume: California requires a contractor's license for nearly all home improvement work valued at $500 or more in combined labor and materials (under BPC 7028). For an ADU or garage conversion — projects that run into six figures — there's no gray zone. A license is required, full stop.

The downstream consequences extend well beyond the build itself:

• Homeowners insurance typically does not cover work by unlicensed or uninsured contractors, defective workmanship, or unpermitted renovations (according to insurance industry guidance).
• LA County DA Nathan Hochman warns that unlicensed hiring leaves homeowners at risk of "illegal down payments, fraud, unsafe construction and an inability to sell your home down the line" (per the DA's office).
• Many homeowners discover the fraud only when the city denies a permit, their insurer rejects a claim, or safety hazards surface months later.

This matters acutely in Altadena right now. In the Palisades Fire disaster zone sting, investigators posing as homeowners solicited bids for — of all things — an accessory dwelling unit, and six unlicensed contractors collectively placed roughly $1.27 million in illegal bids (the LA County DA reported). ADU projects are exactly the kind of work fraudsters target.

So don't take the number on faith. Look it up at cslb.ca.gov yourself, confirm the status is "Active," confirm the classification matches your project, and confirm the name on the license matches the name on your contract. At Altadena ADU Builder, we encourage every homeowner to verify every builder's CSLB number — including our featured builder, JMB Builders LLC (CSLB #1103479), a licensed general contractor handling Eaton Fire rebuilds and ADUs in the area — before any money changes hands.

Book your free ADU feasibility consultation and take our cost quiz to see a concept render for your property — then verify whoever you hire, starting with their license.

The 5-Minute CSLB Verification Checklist

Before you hand a contractor a single dollar, run their license through the state's own database — it takes about five minutes and it's the fastest, highest-leverage protection step you can take for a project the size of an ADU. In Altadena right now, the stakes are real: investigators posed as homeowners seeking ADU bids in a sting that charged six unlicensed contractors with roughly $1.27 million in illegal bids in the Palisades Fire zone, following earlier Eaton Fire zone charges.

Start with the license number itself. A legitimate contractor gives you their number without being asked twice — it's usually printed on the bid, contract, business card, or website footer. JMB Builders LLC, for example, lists CSLB #1103479 openly. If someone hesitates or claims their "partner" holds the license, treat that as a red flag.

Then run the number at cslb.ca.gov and confirm these details:

• Status is "Active" — expired or suspended licenses mean no legal authority to contract.
• Classification matches your project — an ADU needs B general building; a valid number in the wrong classification is still a problem.
• The contractor's bond is current on file.
• Disciplinary actions, if any, are disclosed and explainable.
• Workers' compensation coverage is on record for employees.

Don't skip the classification check. Fraudsters have copied active license numbers directly from the CSLB's public database onto bids — one unlicensed roofer used a stolen number on a $25,000 bid — and even licensed contractors sometimes borrow someone else's number to bid outside their classification. Fraudulent use of a license number is a criminal offense in California, prosecutable as a misdemeanor or felony. If a digit looks off, raise it with the contractor first; a simple transposition error isn't fraud.

Why does this matter so much before a deposit? California caps down payments at $1,000 or 10% of the contract price, whichever is less, and hiring unlicensed exposes you to what the LA County District Attorney calls "illegal down payments, fraud, unsafe construction and an inability to sell your home down the line." Your insurance adds another layer of risk: homeowners policies typically don't cover work by unlicensed or uninsured contractors, defective workmanship, or unpermitted renovations.

A few minutes at cslb.ca.gov — before any money changes hands — protects your deposit, your permit, and your resale. When you're comparing builders for an Altadena ADU, we recommend running every license you're considering, including any featured on this site, through the state database yourself.

Deposit Rules That Protect Your Money

A contractor asking for half the project cost up front isn't just being pushy — in California, that request is a red flag written into law. State CSLB guidance caps your down payment at $1,000 or 10% of the contract price, whichever is less, a limit confirmed by both legal guidance on contractor stings and insurance industry sources.

For a typical ADU project, that means a contractor legally can't demand more than $1,000 before work begins. If someone quotes you a $150,000 garage conversion and asks for $15,000 to "get on the schedule," the deposit itself is illegal — and it's often the first move in what investigators call a "deposit and disappear" scheme, a pattern that rose alongside contractor fraud and unfinished-work complaints through 2024 and 2025.

The deposit cap matters here in Altadena for a specific reason. LA County DA Nathan Hochman tied unlicensed hiring directly to "illegal down payments, fraud, unsafe construction and an inability to sell your home down the line" when his office charged six unlicensed contractors who placed roughly $1.27 million in illegal bids in the Palisades Fire disaster zone — following five earlier charges in the Eaton Fire zone. The bait in the Palisades sting was an ADU bid, the exact project many Altadena homeowners are pricing right now.

Beyond the cap itself, CSLB consumer guidance adds four payment rules that protect your money:

• Don't pay cash — you need a check or credit card trail if disputes arise.
• Don't let payments get ahead of the work actually completed.
• Pay only for completed, visible progress, not for "upcoming" phases.
• Withhold the final payment until you're satisfied with the finished work.

A legitimate contractor structures payments around milestones and won't blink at these rules. As one practitioner puts it, "The biggest mistake homeowners make is rushing" — and many homeowners discover fraud only when a permit is denied, an insurer rejects a claim, or safety hazards appear months later.

When Altadena ADU Builder walks homeowners through ADU budgets, we tell everyone the same thing: verify the CSLB license first, then apply the payment rules — including to our featured builder, JMB Builders LLC (CSLB #1103479, disclosed paid placement), which we encourage you to confirm yourself at cslb.ca.gov. A builder who welcomes that check is one you can safely write a deposit check to.

How We Vet Builders in Altadena — and How to Vet Us

Here's the part most guides won't tell you: anyone can print a license number on a bid. In Los Angeles County, investigators have caught unlicensed contractors using stolen numbers copied straight from CSLB's public database — including one roofer who put a lifted number on a $25,000 bid. That's why we hold every builder in this guide to the same standard we'd tell a neighbor to apply.

At Altadena ADU Builder, our featured builder is JMB Builders LLC (CSLB #1103479 — a disclosed paid placement), an Altadena-based licensed general contractor that handles ADUs, custom homes, whole-home remodels, and Eaton Fire rebuilds. Disclosure is one thing; verification is another. We expect you to check us — and them — the same way.

Here's how that looks in practice, using the same checklist from earlier in this article:

• Pull the license number from the bid, contract, or business card — a legitimate contractor shares it without being asked twice.
• Look it up at cslb.ca.gov and confirm the status reads "Active" and the classification fits the project (B — General Building covers ADUs).
• Confirm the bond is current, scan for disciplinary actions, and verify workers' comp coverage.
• Type the number yourself rather than clicking a link the contractor sends — that's how copied-number fraud slips through.

The local stakes are real. The LA County DA's Office charged six unlicensed contractors who placed roughly $1.27 million in illegal bids in the Palisades Fire disaster zone — after five earlier charges in the Eaton Fire zone. The sting used ADU bids as bait, which means Altadena homeowners planning backyard units are exactly the target profile.

DA Nathan Hochman's warning applies to every rebuild and ADU project here: unlicensed hiring risks "illegal down payments, fraud, unsafe construction and an inability to sell your home down the line." CSLB caps down payments at $1,000 or 10% of the contract price, whichever is less — any builder asking for more before you've verified their license is waving a red flag.

If you're weighing whether an ADU makes sense on your lot, start with our ADU cost quiz — it pairs real Altadena permit and cost context with a concept render of what could fit your property. From there, book a free ADU feasibility consultation to talk setbacks, garage conversions, and builder selection. Bring your shortlist — we'll walk through verifying each one at cslb.ca.gov together, including JMB Builders LLC, before anyone asks you for a deposit.