Helping Riverside County homeowners navigate SCE rates and solar options since 2020
California has more residential solar installations than any other state. It also has an active CSLB enforcement division that publishes license data publicly so homeowners can check any contractor in seconds. Most people never run the check. That gap is where unlicensed solar contractors operate, and the consequences for homeowners are serious: denied permits, voided warranties, and no legal recourse when work fails.
Bottom line up front: Every solar company doing business in California must hold an active C-46 Solar Contractor or C-10 Electrical Contractor license from the CSLB. You can verify any license in under two minutes at CSLB.ca.gov. Do this before you sign anything.
Required California Licenses for Solar Installation
California law requires contractors who install solar photovoltaic systems to hold one of two specific CSLB license classifications. The company selling you the system and the company physically installing it both need to be licensed. These are separate requirements from any permit your city or county issues.
C-46 Solar Contractor License
The C-46 classification was created specifically for solar photovoltaic installation. It covers the complete scope of residential and commercial PV work: panel mounting, racking systems, DC wiring, inverter connections, and system commissioning. A contractor with a C-46 license has demonstrated experience and passed a trade exam specific to solar. This is the most direct credential for a solar installer.
C-10 Electrical Contractor License
The C-10 is a general electrical contractor license. Because solar installation is fundamentally an electrical project, California also accepts a C-10 license for solar work. Many established electrical contractors expanded into solar using their existing C-10. A C-10 holder is a licensed electrician, but has not necessarily taken a solar-specific trade exam. Both C-46 and C-10 are legally valid for solar. If you see a C-10, that is not a red flag by itself.
Note on subcontractors: Many solar companies you interact with are primarily sales and project management organizations. The actual roof crew installing the panels is often a licensed subcontractor. Both the general contractor and the subcontractor must be licensed. See the subcontractor verification section below for how to check both.
Any other license classification is not legally sufficient for solar work. If a contractor shows you a B General Building Contractor license and claims it covers solar, that is incorrect under California Business and Professions Code. A B license permits two or more unrelated building trades but does not substitute for a specific trade license when the work is predominantly electrical.
How to Look Up Any Contractor at CSLB.ca.gov
The CSLB Instant License Check is a free, public tool. You do not need to create an account or provide any personal information. Here is the exact process:
Tip: If a solar salesperson says they cannot provide their license number until after you sign a preliminary agreement, do not sign. No legitimate contractor withholds a public license number. The CSLB number is not proprietary information.
What CSLB License Status Means
The status field on a CSLB lookup result carries specific legal meaning. Here is what each status indicates and what you should do:
The license is current, the bond is active, and the contractor is in compliance with CSLB filing requirements. This is what you want to see. Active status does not mean a clean record. Review the disciplinary history separately.
The CSLB has suspended the license. This typically happens when the bond lapses, workers' comp insurance is not renewed, a judgment has not been paid, or the contractor has been cited for serious violations. A suspended contractor cannot legally take on new work. Do not hire.
The contractor did not renew their license before the expiration date. An expired license is not valid for new contracts. The contractor may be able to renew it, but until they do, they cannot legally do licensed work in California. Do not hire on an expired license.
The license was voluntarily canceled or administratively terminated. A canceled license cannot be used for any work. Do not hire.
The CSLB permanently revoked the license as a disciplinary action. This is the most serious status and indicates a significant history of violations or fraud. Do not hire. The contractor may not apply for a new license for a specified period.
If you are mid-contract and the contractor's license status changes, contact the CSLB immediately. California law provides remedies for homeowners who hired contractors who were not properly licensed at the time of contract.
Bond and Insurance Requirements
A CSLB license is not the only protection you need to verify. Two additional financial protections matter: the contractor's license bond and their general liability insurance.
Contractor's License Bond
California requires all licensed contractors to carry a $25,000 contractor's license bond. This bond is not insurance. It is a financial guarantee that protects homeowners if the contractor fails to complete work, abandons a job, or causes financial harm. The CSLB license lookup shows the bonding company and whether the bond is current.
A $25,000 bond is a floor, not a ceiling. For larger projects ($40,000 to $80,000 solar installations), a $25,000 bond provides limited protection. Ask the contractor if they carry additional surety bonds.
General Liability Insurance
General liability insurance is separate from the bond. It covers property damage and bodily injury caused by the contractor during the installation. If a crew member drops a panel and breaks your skylight or damages your roof, general liability pays for it. The bond does not.
Ask the contractor for a certificate of insurance (COI) showing their general liability limits. A minimum of $1 million per occurrence is reasonable for a residential solar project. The COI should name your project and address or be issued to you as a certificate holder.
Workers' Compensation Insurance
Workers' comp is covered separately in the workers' comp section below. For now: the CSLB license lookup shows whether the contractor has workers' comp on file or has filed a valid exemption (typically for sole proprietors with no employees). If the workers' comp field shows a lapse, request a current COI before any crew arrives.
Why an Unlicensed Installer Voids Permits and Warranties
Unlicensed solar work creates a chain of problems that surfaces slowly, often years after installation when you are trying to sell your home, file an insurance claim, or exercise a panel warranty.
Related: See our guide to solar red flags and how to avoid scams in California for a broader look at the warning signs that appear before licensing becomes an issue.
NABCEP Certification: A Credential, Not a License
NABCEP stands for North American Board of Certified Energy Practitioners. It is the most recognized professional certification for solar installers in North America. You will see it listed on contractor websites as a quality signal. It is worth understanding what it is and what it is not.
What NABCEP Is
- +A voluntary professional certification from an independent board
- +Requires documented installation experience (hours)
- +Requires passing a written technical exam
- +Requires ongoing continuing education to maintain
- +The PV Installation Professional (PVIP) is the most relevant for residential solar
- +A positive signal that an installer takes technical knowledge seriously
What NABCEP Is Not
- -Not a government-issued license
- -Not a requirement to legally install solar in California
- -Not a substitute for a CSLB C-46 or C-10 license
- -Not issued by any California state agency
- -Not verifiable through CSLB.ca.gov
- -Not something that protects you if the contractor is unlicensed
If a sales rep mentions NABCEP certification but cannot provide a CSLB license number, the certification is irrelevant. Verify the CSLB license first. If the license is active and NABCEP-certified installers are doing the work, that is a strong combination.
Checking BBB Rating and Complaints
The Better Business Bureau is not a government agency and a BBB accreditation is not a license. However, the BBB complaint database is publicly searchable and provides useful signal about how a company handles disputes after the sale.
Reading Yelp and Google Reviews Critically
Online reviews for solar companies require a more careful read than reviews for a restaurant. The buying experience and the installation experience can be separated by months. The most important information in solar reviews usually appears a year or more after the initial install.
High-Signal Review Content
- +Warranty service experience (especially after 12+ months)
- +Permit and inspection process details
- +How quickly they responded to a problem
- +Whether the crew showed up as scheduled
- +Actual system production vs. promised production
- +Experience with the utility interconnection process
- +Post-install customer service responsiveness
Low-Signal Review Content
- -Generic sales rep praise with no specifics
- -Five-star reviews posted within the first week of signing
- -Reviews mentioning savings amounts that sound too specific
- -Review clusters of similar writing style posted around the same date
- -Responses from the company that do not address the complaint
- -Reviewers who have only one review total on their profile
For large national solar brands, sort reviews by Most Recent and read the most recent 50. Brands with fast growth sometimes have customer service quality that lags behind their sales volume. The most recent reviews reflect current operations more accurately than the overall star average.
For local installers with fewer than 50 total reviews, try calling two or three of the five-star reviewers directly. Most review platforms show first name and last initial. A quick Google search sometimes surfaces their contact information. Homeowners who had a good experience are usually willing to talk.
Verifying Workers' Compensation Insurance
This is the single most financially dangerous gap in most homeowners' solar contractor checks. Workers' compensation insurance is required for any contractor who employs workers. If a crew member falls off your roof and the company does not carry workers' comp, your homeowner's insurance becomes the primary payer, and you face potential liability for the injured worker's medical expenses and lost wages.
Important:"We have insurance" is not sufficient. Ask for a Certificate of Insurance (COI) for workers' compensation specifically. The COI shows the insurer name, policy number, and expiration date. Verify the expiration date has not passed before any crew arrives on your property.
Freedom Forever Bankruptcy: A Due Diligence Case Study
Freedom Forever was one of the largest residential solar installers in the United States, with significant volume in California. In 2025, the company filed for Chapter 11 bankruptcy protection. The case illustrates why license verification alone is not sufficient due diligence.
What This Case Teaches Homeowners
For more detail on this case and what it means for your installer selection, see our dedicated article on the Freedom Forever bankruptcy and what to do if they installed your system.
Practical step: Before signing with any installer, ask: "If your company closes its doors five years from now, how is my workmanship warranty protected?" A company that cannot clearly answer this question is not prepared to back its warranty long-term.
Red Flags During the Sales Process
Licensing problems often show up in the sales process before you have a chance to run the CSLB check. These are the most consistent red flags that signal an unlicensed or under-qualified contractor:
See also: Full guide to solar red flags and scams in California for an expanded list covering door-to-door tactics, PPA misrepresentation, and permit fraud.
Questions to Ask Before Signing Any Contract
These are the specific questions to ask every solar company before you agree to anything. Write down the answers or ask for them in writing. Inconsistent or evasive answers tell you what you need to know.
For a complete guide on evaluating and comparing quotes from multiple companies, see how to compare solar quotes in California.
How to Verify Subcontractors
Most large solar companies operate as a sales and project management layer. The crew that arrives on your roof is often employed by a separate installation subcontracting company. This is a normal industry structure, but it adds a verification step that most homeowners skip.
Under California law, if a licensed general contractor hires an unlicensed subcontractor, the general contractor is jointly liable for any harm caused by the subcontractor. The homeowner is protected in that scenario. However, verifying the sub independently protects you against situations where the general contractor misrepresents the sub's credentials.
The CSLB Complaint Process if Things Go Wrong
If you hire a licensed contractor and the work is defective, the job is abandoned, or the contractor violates California law, the CSLB has an enforcement process that gives you options beyond small claims court.
File a Complaint with the CSLB
Go to CSLB.ca.gov and use the complaint filing system. You will need the contractor's license number, the contract dates, a description of the issue, and documentation (photos, correspondence, contracts). The CSLB investigates licensed contractor complaints and can cite, fine, suspend, or revoke licenses.
Contractor's State License Bond Claim
If the contractor caused financial harm, you can file a claim against their $25,000 license bond directly with the bonding company. The CSLB license detail page shows the bonding company name. Contact them with documentation of your damages. Bond claims do not require a court judgment in all cases.
CSLB Arbitration Program
The CSLB operates an arbitration program for disputes involving licensed contractors. This is often faster and less expensive than civil litigation. Both parties must agree to binding arbitration. The CSLB provides a list of approved arbitrators.
Small Claims Court
California small claims court handles disputes up to $12,500. For defective solar work, document everything: photos of defects, written communications with the contractor, independent inspection reports, and a cost estimate to repair the defective work from a second licensed contractor. Small claims does not require an attorney.
If the contractor is unlicensed: CSLB enforcement applies. Report the unlicensed contractor to the CSLB at 1-800-321-CSLB. Unlicensed contracting is a misdemeanor. Additionally, California Business and Professions Code Section 7031 may allow you to recover all payments made to an unlicensed contractor.
Related Reading
Frequently Asked Questions
What license does a solar installer need in California?
California requires solar installers to hold either a C-46 Solar Contractor license or a C-10 Electrical Contractor license issued by the Contractors State License Board (CSLB). A C-46 covers the full scope of solar photovoltaic work. A C-10 covers electrical work and is also accepted for solar installations. Both must be active and in good standing before any work begins.
How do I verify a solar contractor's license in California?
Go to CSLB.ca.gov and use the Instant License Check tool. Enter the contractor's license number, business name, or owner name. The result shows the license classification (C-46 or C-10), current status (active, suspended, expired, or canceled), bond amount, workers' compensation status, and any disciplinary history. Always verify before signing any contract.
What does 'Active' status mean on a CSLB license?
An Active license means the contractor is currently licensed, bonded, and in compliance with CSLB requirements. It does not mean they have a clean record. Always click through to the disciplinary history tab to check for citations, accusations, or judgments. A license can be Active while also having unresolved complaints filed against it.
What happens if a solar installer is not licensed in California?
If an unlicensed contractor installs your solar system, you lose several legal protections: the city will likely deny a building permit, your homeowner's insurance may not cover damage caused by the installation, manufacturer panel and inverter warranties can be voided, and you have limited legal recourse if the work is defective. Unlicensed solar work is a misdemeanor in California under Business and Professions Code Section 7028.
Is NABCEP certification a license?
No. NABCEP (North American Board of Certified Energy Practitioners) certification is a voluntary professional credential, not a government license. NABCEP-certified installers have demonstrated technical knowledge through testing and documented experience. It is a positive signal about installer quality, but it does not replace a CSLB contractor license. You need both: a valid CSLB license to operate legally, and NABCEP certification as an optional quality indicator.
What bond is required for a solar contractor in California?
California requires licensed contractors to carry a contractor's license bond of $25,000 as of 2025. This bond protects homeowners if the contractor fails to complete work or causes damage. You can verify the bond amount and the bonding company directly on the CSLB license lookup page. If the bond is expired or canceled, the license should show Suspended status.
What is workers' compensation insurance and why does it matter for solar?
Workers' compensation insurance covers medical bills and lost wages if a worker is injured on your property. If a solar installer does not carry workers' comp and an employee is hurt on your roof, you as the homeowner could be sued for damages. CSLB license lookup shows whether a contractor has workers' comp on file or has filed a valid exemption. Verify this before any crew arrives.
What is the Freedom Forever bankruptcy and what does it mean for verification?
Freedom Forever, one of the largest solar installers in California, filed for Chapter 11 bankruptcy protection in 2025. This illustrates why due diligence extends beyond checking a license at signing. A company can have an active CSLB license today and file for bankruptcy before your 25-year warranty period ends. Best practice: verify the license, check BBB complaints, research the company's financial standing, and ask about who specifically backs the equipment warranty versus the workmanship warranty.
Pre-Signing Verification Checklist
Print or save this list. Complete every item before you sign any solar contract.
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