In California, the Contractors State License Board (CSLB) lets anyone look up a contractor's license for free. Here's how to do it, what the results mean, and a few contract rules that are specific to swimming pools.
A pool is a big project with a lot of money paid out in stages, so it's worth five minutes to confirm you're dealing with a properly licensed and insured contractor. California makes this easy. Every licensed contractor is listed with the Contractors State License Board, and the lookup is public.
Step 1: Get the license number
Licensed California contractors are required to include their license number on contracts and bids and in their advertising. If a builder can't or won't give you a license number, that's your answer. Write it down along with the exact business name on the bid.
Step 2: Look it up on the CSLB website
Go to cslb.ca.gov and use the "Check a License" tool. You can search by license number, business name or personnel name. Searching by number is the most reliable, because similar business names are common.
Step 3: Read the results carefully
The license detail page shows several things worth checking:
- License status. It should say active. Expired, suspended or revoked licenses are a stop sign.
- Business name and address. These should match the bid and the company you're talking to.
- Classifications. Pool builders typically hold a C-53 (Swimming Pool) license. Some larger backyard projects are run by a Class B general building contractor. Make sure the classification fits the work.
- Bonding. The listing shows the contractor's bond. A bond is not insurance for your project, but an active bond is a basic requirement.
- Workers' compensation. If the company has employees, it should show workers' comp coverage. If the listing says the contractor is exempt because they have no employees, ask who will actually be doing the digging, steel and plaster.
- Legal actions and complaints. Disclosable complaints and disciplinary actions appear on the page. One old issue isn't necessarily a deal breaker, but a pattern is worth asking about.
Step 4: Check the salesperson too
If the person selling you the pool isn't the license holder, they may need to be registered with CSLB as a Home Improvement Salesperson (HIS). You can look them up on the same site by name.
Step 5: Ask for proof of insurance
California doesn't require general liability insurance for most contractors, so the license lookup won't tell you whether a builder carries it. Ask for a certificate of insurance and check that the dates cover your project. For a pool, with heavy equipment in your yard, you want to see it.
Contract rules that protect you
California has specific rules for home improvement contracts, and some apply only to swimming pools. CSLB publishes these in its consumer guides, and they're worth knowing before you sign:
- The contract must be in writing and include the contractor's license number.
- For swimming pools, the down payment is limited to 2% of the contract price or $200, whichever is greater. Anyone asking for a large deposit up front is a red flag.
- Progress payments shouldn't get ahead of the work that's actually been completed.
- If you sign a home improvement contract in your home, you generally have a right to cancel within three business days (five if you're 65 or older). The contractor must give you a cancellation notice.
Rules change from time to time, so check the current version on the CSLB website or ask CSLB directly if anything in a contract looks unusual.
Questions to ask any pool builder
- Who will be on site each day, and who is my point of contact?
- Which parts of the job do you subcontract (excavation, steel, gunite, plaster, electrical)?
- Who pulls the permit, and who handles HOA approval?
- What's the payment schedule, tied to which milestones?
- What warranty do you give on the shell, the finish and the equipment, and is it in writing?
- Can I talk to two or three recent customers in my area?
Red flags worth walking away from
- No license number, or a number that belongs to a different business name.
- Pressure to sign the same day, or a big 'today only' discount.
- A request for a large deposit before any work starts.
- Reluctance to pull a permit, or a suggestion that you pull it as the owner.
- Cash-only payment with no written contract.
How we handle this
Coastline Pools does weekly cleaning with our own team on routes that start in the Inland Empire; elsewhere we match you with a vetted local pro. Repairs, remodels and new pool construction are done by independently licensed, insured contractors we partner with. Before any work starts, you get the contractor's name and license number in writing, and we encourage you to look it up using the steps above. We'd rather you check than take our word for it.
Ready to start with a price instead of a sales pitch? Design your pool in 3D and see an estimate for your own yard, check the ranges in our pool cost guide, or read what's in a pool quote, line by line. If you're in Murrieta, our Murrieta new-pool page covers local notes.
Free 3D designer. Estimate before you share your number.
By the Coastline Pools team · Published November 12, 2026 · Last reviewed November 12, 2026. General information, not legal or financial advice.