How to Start a Solar Installation Business in California: C-46 License, Bond and Experience Rules

If you want to install solar in California and get paid for it, you need a license from the Contractors State License Board (CSLB) before you take your first job. Solar sits where several license classes overlap, it has a disclosure form that is unique to the industry, and its contract rules are stricter than most home improvement work. This guide covers the CSLB license route first, then the consumer contract rules that apply to solar, then the entity, tax and local requirements you handle with other agencies.

Informational notice: This article is informational content, not legal or tax advice. Fees, deadlines and rules change, and some items below need confirmation from the agency named. For your specific situation, consult a licensed California attorney and a certified public accountant.

What You Need Before You Start

• Documentation of four years of journey-level experience within the last ten years, such as job records, permits and references from employers or supervisors
• Funds for the $450 application fee and the initial license fee of $200 (sole owner) or $350 (other entities such as LLCs and corporations)
• Money for the exam fees, which you pay to the testing vendor (confirm the amount with CSLB)
• A $25,000 contractor bond, plus a $100,000 bond and at least $1,000,000 of liability insurance if an LLC holds the license
• An entity, or a plan for one, with Articles of Organization (Form LLC-1, $70) or Articles of Incorporation ($100)
• A California agent for service of process, and a California office for an LLC
• Bookmarks for the CSLB, Secretary of State, CDTFA, Franchise Tax Board and EDD websites

Step 1: Confirm Which License Class Covers Your Work

The C-46 Solar class is the license built for solar. It covers installing, modifying, maintaining and repairing thermal and photovoltaic (PV) solar energy systems. A C-46 holder may not perform other building trades beyond what is required to install the system. If a job pulls in electrical work, roofing or plumbing beyond that scope, you need the right additional license or a subcontractor who holds it.

Battery storage is where many new installers get tripped up. CSLB's regulations say battery energy storage is not part of a C-46 license, except as incidental and supplemental to a PV installation when the battery is rated at or under 80 kilowatt-hours. Those battery rules were listed as temporarily stayed in the 2026 edition, so check with CSLB before you quote any storage work.

Other license classes can also install solar. Confirm which one fits your work with CSLB:

• C-10 Electrical covers photovoltaic systems.
• C-36 Plumbing covers solar equipment that heats water.
• C-20 covers heating and air-conditioning systems that use solar energy.
• Class A General Engineering and Class B General Building contractors can do active solar work.

The $1,000 small-job exemption does not settle the licensing question for most solar work. Under Business and Professions Code 7048, the exemption does not cover work that needs a building permit, and solar systems generally do. You also lose the exemption by advertising for the work or employing helpers. Check with your local building department on whether a particular job needs a permit.

Step 2: Meet the Experience Requirement

CSLB requires four years of journey-level experience gained within the last ten years. Journey-level generally means you performed the work as a skilled worker, not as a helper. Keep records that show your role, the dates and the types of systems you worked on. Permits, signed job logs, pay stubs and written references all help. Ask CSLB what documentation it accepts before you assemble the file, because gaps in your paperwork can delay the application.

Step 3: Post the Bond and Arrange Insurance

Every applicant must post a $25,000 contractor bond (BPC 7071.6). A bond is a surety guarantee, not money sitting in an account. The surety company charges a premium, which usually depends on your credit and financial profile, so get quotes early. If an LLC holds the license, add a $100,000 bond and carry at least $1,000,000 of liability insurance.

Step 4: Pass the Exams

You take a law and business exam and the C-46 trade exam. Every applicant in every class also takes the open-book asbestos exam. You pay the exam fee to the testing vendor, not to CSLB. Confirm the current amount and scheduling with CSLB, and study from the exam information CSLB provides. Passing all required exams is needed before the license can issue.

Step 5: Submit the Application and Fees

Submit the application with the $450 application fee and the initial license fee ($200 for a sole owner or $350 for other entities). The CSLB contractor license guide on cslb.ca.gov explains the shared mechanics for every contractor class, including exam scheduling and what happens after you pass.

Once licensed, check whether you, or anyone who sells home improvement contracts for your company, must register as a home improvement salesperson. CSLB lists a $200 application fee for that registration. Check with CSLB on who must register, because the answer depends on the role the person plays.

Step 6: Handle Workers' Compensation and Payroll

If you have no employees, an owner may be able to file a workers' compensation exemption through December 31, 2027. The exemption does not apply to the five license classes that must carry coverage. C-46 is not one of those five, but check with CSLB, because the rule changes on January 1, 2028.

When you hire, register with the Employment Development Department (EDD) at edd.ca.gov. The state minimum wage is $16.90 in 2026 and $17.40 starting January 1, 2027. That 2027 figure comes from a secondary source, so verify it with the state before you set pay rates.

Step 7: Follow the Solar-Specific Contract Rules

Solar has two layers of consumer protection, and both apply to every sale, financing arrangement or lease you write.

The solar energy system disclosure document. CSLB and the California Public Utilities Commission publish a solar energy system disclosure document. You must give it to the customer before the sale, financing or lease is completed. It must also be printed on the front page of every solar contract in 16-point boldface. The document shows the total cost and payments, including financing, explains how to file a complaint, and states the consumer's cancellation right under Business and Professions Code 7159 (BPC 7169).

The home improvement contract rules. These also apply. The contract must be written and show the price in dollars and cents. The down payment is capped at the lesser of $1,000 or 10 percent of the contract price. You may not collect payments ahead of the work you have completed (BPC 7159.5).

Step 8: Form Your Entity With the Secretary of State

A California business registers its entity with the Secretary of State. The Secretary of State issues no general business license, so entity filing is the first government step. For an LLC:

• File Articles of Organization (Form LLC-1) for $70 through bizFile Online. Online filings are normally processed within about 5 business days or less. Expedited options are $350 for 24-hour processing, $750 for same-day processing (received by 9:30 a.m.) and $500 for 4-hour drop-off with precleared service. Paper filings take 10 or more business days.
• Your name must include "limited liability company," "L.L.C." or "LLC" ("Limited" may be "Ltd." and "company" may be "Co."). It may not include "bank," "trust," "trustee," "incorporated," "inc.," "corporation" or "corp." You can reserve a name for $10 for 60 days.
• Appoint a registered agent who is either an individual residing in California or a corporation holding a Corporations Code 1505 certificate. An LLC must also keep an office in California.
• File a Statement of Information (Form LLC-12) for $20 within 90 days of filing the articles, then every two years during the six-month window ending on the last day of the anniversary month. The Franchise Tax Board assesses a $250 penalty if you miss it after a Secretary of State notice.
• Plan for the franchise tax. Every LLC organized or registered in 2024 through 2026 owes the $800 minimum annual franchise tax from its first year. The first-year exemption covered only LLCs formed 2021 through 2023. An LLC whose first taxable year begins in 2027, 2028 or 2029 pays $400 in year one under RTC 17941(g)(2), so confirm the amount with the Franchise Tax Board. The LLC fee is $900, $2,500, $6,000 or $11,790 once California-source total income reaches $250,000, $500,000, $1,000,000 or $5,000,000.

If you incorporate instead, Articles of Incorporation cost $100. The Statement of Information (Form SI-550) costs $25 every year, due within 90 days of filing. Corporate income tax is 8.84% (10.84% for banks). An S corporation pays 1.5% of net income with an $800 minimum. The first-year minimum tax is waived for newly formed or qualified corporations and S corporations. Confirm how it applies to you with the Franchise Tax Board.

Step 9: Register a Fictitious Business Name if You Need One

If you operate under a name other than your legal entity name, such as Sample Solar Works, file a Fictitious Business Name Statement with the county clerk-recorder in the county of your principal place of business. File within 40 days of starting, then publish the statement in a newspaper once a week for four weeks. The statement expires after five years. The statutory fee is $10 plus $2 per additional name or owner (Business and Professions Code 17929), but counties charge more, and publication is a separate cost. Details are at sos.ca.gov.

Step 10: Register for Sales Tax and Payroll

The CDTFA seller's permit is free, but it is not a business license. Register with the California Department of Tax and Fee Administration at cdtfa.ca.gov if you sell taxable goods. Solar contracts often bundle equipment and labor, so check with CDTFA how the equipment portion of an installation contract is treated. The statewide base sales tax rate is 7.25%, and district taxes push city rates to between 7.25% and 11.75%. A resale certificate has no required form. Register with EDD if you have employees.

Step 11: Check Local Taxes, Permits and Utility Rules

California has no general statewide business license. Most cities charge a local business tax or registration certificate. Of the 483 cities, 445 report revenue from one. There is no common formula, so the answer depends on the city. Counties license only regulated activities. Contact your city's business license office before you advertise.

Permit fees and timelines come from your local building department, so call before you bid. Interconnection with the utility, the net billing tariff and current credit rates should be confirmed directly with your utility and the California Public Utilities Commission. This guide does not state credit rates, because they change and are not uniform.

What to Expect When You Finish

Once your license, entity and tax registrations are in place, you can bid on C-46 solar work and sign contracts that meet the disclosure and payment rules above. New installers often find that paperwork and permitting take longer than expected, so plan your cash flow for the months before your first installation. Results depend on your experience, your local market and your permit timeline. Nothing in this guide guarantees licensing approval or any particular amount of work.

Common Mistakes to Avoid

• Assuming the $1,000 exemption covers a solar job that needs a building permit.
• Advertising solar work or hiring helpers before you hold a license, which costs you the exemption.
• Quoting battery storage without checking CSLB, since the battery rules were listed as temporarily stayed in the 2026 edition.
• Printing the disclosure document anywhere other than the front page, or in type smaller than 16-point boldface.
• Taking a down payment above the lesser of $1,000 or 10 percent, or taking payments ahead of the work.
• Missing the Statement of Information filing, which can bring a $250 penalty for an LLC.
• Forgetting that the workers' compensation exemption rules change on January 1, 2028.
• Skipping the local business tax because the state has no general business license.

Practical Tips

• Start your experience file early. You cannot easily rebuild job records from memory years later.
• Get bond and insurance quotes before you choose an entity, because the LLC requirements are higher.
• Search the name you want in the bizFile business search before you reserve it.
• California does not allow a domestic series LLC, so you cannot use one entity with separate series to split up different lines of work.
• For planning help beyond this guide, the California Small Business Development Center network is a useful starting point.

Before you commit money to a license, bond or entity, confirm each figure above with the agency named, and have an attorney and a CPA review your plan.