How to Verify a California Solar Contractor Before You Sign

The licenses that can legally do solar work

Three classifications cover almost every residential solar job in California.

C-46 Solar is the classification built for this exact work. CSLB's own scope language: a C-46 contractor "installs, modifies, maintains, and repairs thermal and photovoltaic solar energy systems," and is barred from performing other building trades except when required to install the solar system itself (cslb.ca.gov, Licensing Classifications, checked 2026-09-05). If the crew is only doing solar, this is the classification you'd expect to see.

C-10 Electrical also covers it directly. The official scope names "solar photovoltaic cells" among the things a C-10 contractor is licensed to place, install, erect, or connect. A licensed electrician doing your solar tie-in under a C-10 is not a red flag by itself.

B General Building is where it gets more conditional. Under Bus. & Prof. Code § 7057(a), a B contractor's business has to involve construction using at least two unrelated trades or crafts, and § 7057(b) explicitly won't let framing or carpentry count toward that two-trade minimum — the B contractor either holds the specialty license for any other trade on the job or subcontracts it out. CSLB's consumer-facing Solar Smart page lists B among classifications "authorized for solar installations," but nothing in the primary sources confirms a B contractor can pull a standalone, solar-only permit. The practical rule: if you're being sold under a B license and there's no accompanying trade (a re-roof, a structural addition) bundled into the job, ask directly which classification and which trades the permit will actually be filed under. Get the answer in writing.

A handful of other classifications show up for specific solar applications rather than rooftop PV: A (General Engineering), C-4 (boiler/hot water/steam), C-36 (plumbing) for solar water heating, and C-53 (swimming pool) for solar pool heating. None of those substitute for C-46 or C-10 on a standard PV install.

Look the license up yourself before the second visit

CSLB's lookup tool lives at cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx. You can search by license number, business name, the individual's name, or a Home Improvement Salesperson (HIS) registration number — use whichever one is on the business card in front of you.

The tool returns license status and complaint disclosure. Don't stop at the company. California also requires the individual doing the in-home selling to carry a separate HIS registration, and that name or number runs through the same lookup tool. A licensed company with an unregistered salesperson at your door is still a problem — verify the person, not just the letterhead.

The bond behind the license — and what it doesn't cover

Every active CSLB license carries a contractor's bond, currently set at $25,000 under Bus. & Prof. Code § 7071.6(a). That figure is a genuine increase, not a renumbering: the bond stood at $15,000 before SB 607 (Stats. 2021, ch. 367) raised it to $25,000, effective January 1, 2023 — a 67% jump in required coverage. If you see a contractor's paperwork or marketing citing the old $15,000 figure, that's stale information, not a typo.

A bond is not insurance for you personally, and it's not a guarantee of restitution. CSLB is explicit on its complaint-filing page that an investigation into a contractor doesn't guarantee you get money back — for financial recovery, the state points you to small claims court or private counsel. Treat the bond as evidence the contractor is currently in good standing with the state, not as a fund you can draw against if the install goes bad.

The disclosure document you're legally owed before you sign

Bus. & Prof. Code § 7169 required CSLB and the CPUC to jointly build a Solar Energy System Disclosure Document, live since July 1, 2018, and the contractor must hand it to you before completing any sale, financing agreement, or lease — not after.

The statute requires the front page, in bold 16-point type, to spell out the total cost and total payments for the system including financing costs, the complaint procedure, and your cancellation rights under § 7159. It can also include (at CSLB's discretion) financing sources, panel output estimates, utility fee information, rebate terms, the contractor's license number, and lease-versus-purchase comparisons. The whole document has to be in the same language the salesperson used to pitch you. One exemption: solar installed as a standard feature on new-construction homes doesn't trigger this requirement.

We can confirm the legal requirement with confidence from the statute itself. We can't confirm, as of this writing (2026-09-05), that the specific PDF template CSLB and CPUC published in 2018 is still the current live version without amendment — treat the requirement as settled law and ask to see the actual document, rather than assuming its current layout matches any sample you've seen online.

Down payment caps and what a compliant contract looks like

California home improvement contracts, solar included, are capped on the front-end deposit. The statutory notice required in the contract itself reads, verbatim: "THE DOWNPAYMENT MAY NOT EXCEED $1,000 OR 10 PERCENT OF THE CONTRACT PRICE, WHICHEVER IS LESS" (Bus. & Prof. Code § 7159). A $40,000 system caps the legal down payment at $1,000 — 10% of $40,000 is $4,000, and the statute takes the lower of the two figures, not the higher.

A written contract under § 7159 also has to specify the work, not leave it vague. If the paperwork in front of you doesn't name the equipment, the exact panel count, system size, and an install timeline, that's not a formality gap — it's the same specificity the law requires, missing.

Your right to cancel comes from two overlapping laws

Most in-home solar sales trigger two separate cancellation statutes at once, and a contractor only telling you about one of them isn't giving you the full picture.

Bus. & Prof. Code § 7159 gives home improvement contract customers 3 business days to cancel, extended to 5 business days for senior citizens, and to 7 business days for contracts tied to declared-emergency or catastrophic-event repairs. Civil Code § 1689.7 separately covers home solicitation contracts — any contract signed somewhere other than the seller's regular place of business, which covers the overwhelming majority of in-home solar sales calls. Its language is specific: "You, the buyer, may cancel this transaction at any time prior to midnight of the third business day after the date of this transaction," extended to the fifth business day for seniors.

Both statutes require the cancellation notice in bold type (minimum 10-point under § 1689.7, 12-point for certain contractor repair contracts under § 7159) positioned right next to your signature line, in the same language as the sales pitch, with a detachable Notice of Cancellation form attached. Civil Code § 1689.7 goes one step further: the seller has to orally explain your cancellation right at signing, not just hand you paperwork and let you find it yourself. If nobody said the words out loud, that's a compliance gap worth noting before your clock even starts.

Red flags in the sales pitch itself

CSLB's own consumer guidance (Solar Smart page, cslb.ca.gov, checked 2026-09-05) lines up with what shows up in complaint filings: verbal-only savings or production promises that never make it into the written contract, pressure to sign same-day with no review period, and contracts missing the specifics — equipment brand and model, exact panel count, system size, install timeline. Ask for all of it in writing before you sign anything.

Two further practices worth doing regardless of how the pitch goes: get at least three competing bids before committing to any solar contract, and get signed mechanics lien release forms from the contractor, subcontractors, and suppliers once the job is paid — that protects your home from a lien if the contractor doesn't pay a vendor downstream.

One financing structure deserves its own warning: PACE/HERO-style tax-lien financing. These programs can carry above-market interest rates, attach to your property as a tax lien rather than a personal loan, and require full payoff before you can refinance or sell the home. That's not a knock on solar financing broadly — it's a specific, CSLB-flagged caution about one structure. Ask exactly how any financing is secured before you sign, whether it's PACE, a loan, a lease, or a PPA.

If something's already gone wrong

CSLB maintains a dedicated Solar Complaint Form, separate from its general contractor complaint form, plus a Lead Referral form for problems on an active or ongoing project and a Building Permit Violation Referral form for unpermitted work (cslb.ca.gov, Filing a Complaint, checked 2026-09-05). Complaints can be filed against licensed or unlicensed contractors for conduct up to four years old.

CSLB is explicit that filing a complaint doesn't guarantee you get money back — an investigation can lead to license discipline, but for financial recovery the agency points you to small claims court or your own attorney. If you're chasing a refund or damages rather than a regulatory action against the contractor's license, plan for that as a separate track from day one, not something CSLB's complaint process resolves on its own.