How to Hire a General Contractor in California: The Full Checklist

Why License Verification Is the First — and Most Consequential — Step

Hiring an unlicensed contractor in California doesn't just expose your project to risk — it can expose your wallet to legal consequences that cut both ways. Before you compare bids or sign anything, license verification is the single step that determines whether you're protected under state law or on your own.

California runs one of the most structured licensing systems in the country. The Contractors State License Board, established in 1929, currently licenses approximately 285,000 contractors across 45 classifications, from general builders to electricians, plumbers, and pool contractors. And the bar for needing a license is low: per LA County's Department of Consumer and Business Affairs, licensing is required for home improvements costing $500 or more, while CSLB requires a valid license for any work valued at $1,000 or more in combined labor and materials, or any job requiring a building permit. In practice, almost every real remodel or rebuild crosses these thresholds.

The legal stakes are spelled out in Business and Professions Code §7031. Under this statute, an unlicensed contractor cannot sue to collect payment for work requiring a license — and a homeowner who hired one may recover all compensation already paid, even if the work was completed satisfactorily, a remedy courts have upheld in cases like Ahdout v. Hekmatjah. As California attorneys at Etehad Law put it, this makes checking a contractor's license far more than a formality. One nuance matters: what counts is whether the contractor held a valid license during the actual work period, not just today.

Verification takes minutes, and the state gives you two easy channels:

• Use CSLB's free online license lookup, which covers contractors and Home Improvement Salesperson registrations and includes complaint disclosure information.
• Call CSLB directly at (800) 321-CSLB (2752) to verify by phone.
• Confirm the license classification actually matches your project scope — multi-trade jobs like kitchen remodels generally require a licensed "B" General Building contractor.
• Check the license status across your full project timeline, not just the current date.

This is also where independent resources earn their keep. The Altadena Builder Directory, a free registry of Altadena contractors — including ADU builders, remodelers, and fire-rebuild specialists — verifies every listing against CSLB data and displays a verification seal once a license match is confirmed, with ratings drawn only from real attributed public sources. Its featured listing, JMB Builders LLC (CSLB #1103479), is a labeled paid placement, and the directory's free lookup tool lets you verify any California contractor yourself, whether or not they appear in the registry.

CSLB's own warning sums it up: don't take the chance to save a few dollars, because you'll probably end up paying more in the long run.

Matching the Right License to Your Project: General vs. Specialty Contractors

A valid license number isn't enough — the classification on that license determines whether your contractor can legally touch your project at all. California's Contractors State License Board licenses roughly 285,000 contractors across 45 classifications, and hiring the wrong type can void your protections entirely.

Here's the distinction that trips up most homeowners. A general building contractor may only perform specialty work — plumbing, electrical, roofing — if they hold that specialty license or subcontract to someone who does. But CSLB's rules carve out an exception known as the "two trades" rule: when a project involves more than two types of work on a building, a licensed "B" General Building contractor should oversee the entire job.

What does that mean in practice? Consider the most common home project in California:

• A kitchen remodel combining plumbing, electrical, and carpentry under a single contract requires a licensed "B" General Building contractor — CSLB uses exactly this example.
• A single-trade job, like re-piping a bathroom, can go to a specialty contractor holding that specific classification.
• Hiring a specialty contractor for a multi-trade project leaves you exposed under B&P Code §7031 — an unlicensed or misclassified contractor cannot sue for payment, and you may recover everything you already paid.

An active license today doesn't prove the contractor was licensed during your project. That nuance carries real legal weight. Under §7031(b), a homeowner may recover all compensation paid — even for work performed satisfactorily — if the contractor lacked proper licensure during the actual work period, per California legal analysis. A license suspended mid-project, or one activated after the work began, changes your legal position dramatically.

Verification, then, is more than a checkbox. CSLB's own license lookup includes complaint disclosure, and the agency recommends reviewing its hiring guidance before signing anything.

The Altadena Builder Directory makes this step easier for local homeowners: its free CSLB license-lookup tool lets you verify any California contractor, with license data attributed directly to CSLB, and listings display a verification seal only after a license match is confirmed. Every listing in the registry — including featured firms like JMB Builders LLC (CSLB #1103479, labeled paid placement) — carries that license-verified status, so you're never starting from an unverified name.

Before you sign, confirm two things: the license classification matches your project scope, and the license was continuously active across your entire work period. Both take minutes to check — and both protect you when it matters most.

Vetting Bids, References, and Permits Before You Sign

The cheapest bid is rarely the best bid — and in California, the bid-and-reference stage is where smart homeowners separate true professionals from smooth talkers. Los Angeles County's Department of Consumer and Business Affairs recommends collecting three bids with three references each, then actually visiting past clients to see finished work firsthand (LA County DCBA).

When you sit down with those bids, resist the urge to compare only the bottom line. Look at what each bid actually includes:

• A detailed scope of work — vague, one-line bids make change-order disputes almost inevitable
• Specific materials and brands, not generic allowances
• A realistic timeline with start and completion dates
• A payment schedule tied to completed work, not calendar dates

Permits deserve equal attention before you sign. DCBA advises homeowners to check with the local building department about permit requirements before work begins — and to confirm in writing who is responsible for pulling them. This matters enormously in Altadena right now, where ADU additions, whole-home remodels, and fire-rebuild projects each carry distinct permitting paths. A contractor who asks you to pull an owner-builder permit to save money is shifting liability onto you; make permit responsibility an explicit contract term, not a handshake assumption.

Reference checks should go beyond a quick phone call. Ask past clients whether the project finished on budget, how the contractor handled surprises behind the walls, and whether they would hire the same crew again. For fire-rebuild work specifically, ask for examples of completed rebuilds — experience with insurance coordination and current Los Angeles County rebuild standards is not universal among licensed builders.

Before any of this, every bid should come from a contractor whose license you have verified. The CSLB's free online license lookup shows license status, classification, and complaint history, and you can also verify by phone at (800) 321-CSLB. Remember that a contractor must have been licensed during the actual work period — an active license today does not guarantee coverage for a past project, a point California attorneys stress when advising homeowners on unlicensed contractor disputes.

Every listing in the Altadena Builder Directory is license-verified against the CSLB, and each verified listing displays a verification seal once the license match is confirmed — so you can start your three-bid process with a shortlist you already trust. Featured listing: JMB Builders LLC (CSLB #1103479), a labeled paid placement.

Contracts and Payments: California's Legal Guardrails

The moment you sign a contract in California, the law starts working for you — but only if that contract is complete and your payments follow the rules. Understanding these guardrails before you sign can save you thousands of dollars and months of headaches.

A legally sound written contract must specify the scope of work, full price, timeline, and materials. According to LA County's Department of Consumer and Business Affairs, you should never sign a blank or partially blank contract — all promises the contractor makes verbally belong in writing.

California also caps how much money changes hands before work begins. The maximum legal down payment is $1,000 or 10% of the total project cost, whichever is less. After that, keep payments aligned with completed work rather than paying ahead of schedule.

Here's what the payment rules protect you from, and how to stay within them:

• Never pay cash — you won't have proof of payment if a dispute arises.
• Never sign a completion certificate or make the final payment until you are fully satisfied with the work.
• Cap your down payment at $1,000 or 10%, whichever is less.
• Exercise your three-business-day right to cancel by sending certified written notice before midnight of the third day after signing.

Working with a licensed contractor adds another layer of protection: every licensed contractor in California must post a $12,500 bond with the Contractors State License Board, which homeowners can claim against if problems arise. This is one reason license verification matters so much — and why every listing in the Altadena Builder Directory is verified against CSLB records, with a verification seal shown once a license match is confirmed.

If you change your mind after signing, act quickly. You have the right to cancel within three business days, but the cancellation must arrive as certified written notice before midnight of the third day — a phone call won't suffice.

Before you sign anything, take a few minutes to confirm the contractor's license status using a free CSLB license lookup, which also discloses complaint history. For example, JMB Builders LLC (CSLB #1103479), a featured — and labeled paid — listing in our Altadena registry, can be verified directly through that state database.

The contract and payment stage is where careful homeowners separate themselves from costly mistakes. Insist on a complete document, respect the down payment cap, and hold final payment until the work truly meets your standards.

If Something Goes Wrong: Complaints, Bonds, and Recovery Options

Even the most carefully vetted project can hit a snag, so it pays to know your recovery options before you sign anything. California does maintain a post-hire safety net — but it works very differently depending on how much money is at stake.

The Contractors State License Board accepts complaints for up to four years from the date of the act, covering both licensed and unlicensed contractors, according to the CSLB's complaint process. But there's a catch: the CSLB states plainly that its investigations do not guarantee restitution, and the agency's limited authority means money recovery often falls back on you.

Your recovery path scales by dollar amount. Here's how the tiers break down:

• Under $12,500: small claims court or a license bond claim — but note the CSLB does not process surety bond claims, so you must file directly with the surety company.
• Up to $25,000: mandatory arbitration through CSLB's dispute process.
• $25,000–$50,000: voluntary arbitration, if both parties agree.
• Serious violations: citations can carry civil penalties up to $30,000.

The bond itself is a key protection — licensed contractors must post a $12,500 bond with CSLB, which homeowners can claim against for problem work, per LA County's consumer guidance. One timing detail matters: if a bond is canceled, it stays in effect for 30 days after CSLB receives notice, and the license is suspended if no replacement arrives within that window — another reason to keep checking license status during your project, not just before it.

Before filing anything, notify the contractor formally in writing first; CSLB provides a sample letter for this step. Also keep California's statutes of limitations in mind, since they run separately from the CSLB's four-year complaint window — four years for written contract breaches, and up to ten years from substantial completion for latent construction defects.

This is why front-loading your diligence is the cheapest insurance you'll ever buy. A license-verified contractor with an active bond gives you multiple avenues of recovery; an unlicensed one gives you almost none. The Altadena Builder Directory's free CSLB license-lookup tool lets you verify any California contractor in seconds, and every listing in the registry carries a verification seal once a license match is confirmed against CSLB data. Ten minutes of verification now beats four years of arbitration later.