California C-46 Solar Contractor License: Scope, Verification, and Spotting Solar Scams

The C-46 classification covers installing, modifying, maintaining, and repairing thermal and photovoltaic solar energy systems — the panels, mounting, and related components that convert sunlight to heat or electricity.

Solar isn't exclusive to C-46: a project can legally be installed under a C-10 (electrical), C-53 (solar pool heating), C-4/C-36 (solar thermal), or a B general building license, per CSLB's authorized-classifications list. What matters is that whoever signs your contract holds a current license that covers the work.

The key limit: a C-46 solar contractor may not install battery energy storage (BESS) unless it also holds a C-10 electrical license. If your quote includes a home battery, confirm the contractor carries the C-10, or that a properly licensed electrical contractor is doing that portion.

NABCEP (the North American Board of Certified Energy Practitioners) is a respected voluntary certification — but it is not a CSLB license and does not authorize contracting on its own. Verify the CSLB license first.

Any project where combined labor and materials total $1,000 or more must be performed by a CSLB-licensed contractor — the threshold rose from $500 to $1,000 on January 1, 2025 under Assembly Bill 2622 (Business & Professions Code §7048). Below $1,000, a narrow minor-work exemption can apply only if the job isn't part of a larger project and the worker discloses, in advertising and bids, that they aren't licensed.

A residential solar installation is virtually always well above $1,000, so it must be done by a licensed contractor — and the installation requires permits and utility interconnection that a licensed contractor handles. There is no DIY-scale exemption for a real rooftop system.

Confirm the license is Active and the C-46 (or C-10/B) classification is listed — on the CSLB "Check a License" tool or on the contractor's profile in this directory. Match the license to the exact business on your contract. Check that the $25,000 contractor bond is on file (Business & Professions Code §7071.6) and that workers' compensation coverage — or a valid exemption — is shown.

Solar draws high-pressure sales: a legitimate company will let you verify the license before signing. Be wary of 'today only' pricing, large upfront deposits, vague company names that don't match the license, and promises that gloss over permits or interconnection. Verifying the CSLB record is the single fastest way to separate a real installer from a scam.

A solar contractor must carry workers' compensation insurance for any employees. A contractor that genuinely works alone can currently file a no-employee exemption, so the CSLB record may show an exemption rather than a policy — confirm one or the other before you hire.

Senate Bill 1455 will extend that requirement to every CSLB licensee — regardless of employees — on January 1, 2028, with CSLB's exemption-verification process live by January 1, 2027. Five high-risk classifications already carry no exemption at all — C-8 (concrete), C-20 (HVAC), C-22 (asbestos abatement), C-39 (roofing), and D-49 (tree service) — and must hold coverage regardless of employees.