How to Choose a Bathroom Remodeling Contractor in California

The short answer: in California, check the license first, insist on a written contract, and refuse to pay a large deposit. Those three steps filter out most of the bad outcomes before design or tile ever comes up. Everything else — portfolio, communication, chemistry — matters, but it matters second.

Here is the order we would use if we were hiring a bathroom remodeler ourselves.

1. Verify the license yourself, on the state's own site

Anyone taking on a home improvement job in California worth more than $500 in combined labor and materials must hold a license from the Contractors State License Board. A license number printed on a truck or a website is not verification.

Look the number up directly at cslb.ca.gov. The free lookup shows you:

• Whether the license is active right now, not just issued at some point
• The classification — which trades that contractor is actually licensed to perform
• Workers compensation coverage status
• Bond status
• Any disclosed complaints or disciplinary history

Two minutes on that page tells you more than an hour of reading reviews. If the number does not resolve, or the name on the license does not match the business you are talking to, stop there.

2. Get the contract in writing, before any money moves

California requires a written contract for home improvement work. Read it before you sign, and make sure it actually describes your project rather than a generic scope.

A contract worth signing names the specific products going in — the fan model, the tile, the vanity, the valve — not "owner to select" on every line. Allowances are where budgets quietly drift. Every allowance is a number someone guessed, and you are the one who pays the difference.

It should also carry a real schedule with a start date and a completion date, a written change-order process, and the payment schedule tied to completed milestones rather than dates on a calendar.

3. Know the deposit rules

This is the single most useful consumer protection in California remodeling, and most homeowners have never heard of it.

On a home improvement contract, the down payment is capped at 10% of the contract price or $1,000 — whichever is less. Not whichever is more. A contractor asking for 30% up front on a $40,000 bathroom is asking for something the law does not allow.

You also generally have a three-business-day right to cancel a home improvement contract signed at your home.

Treat a large upfront demand as the red flag it is. Legitimate contractors have working capital and supplier accounts; they do not need your money to start your job.

4. Ask what happens behind the tile

A bathroom is the easiest room in the house to make look finished and build badly. Everything that fails later is hidden by the time you see it. So ask about the parts you will never see again:

• Waterproofing. What membrane system, and does it run continuously up the wet walls — or is it cement board and sealant at the seams?
• Slope and the drain. On a curbless shower especially, the slope has to be right before a single tile is set. Ask how they establish it.
• Ventilation. What fan, sized how, and ducted to where? "Into the attic" is not an answer. It has to terminate outside the building.
• What happens if the subfloor is rotten. It happens. The question is whether you get a photo and a price before they proceed, or a surprise invoice after.

Near the coast, this matters more. In the fog belt and anywhere salt air reaches, ventilation and material choice do more for the lifespan of a bathroom than the finish budget does. We go deeper on this in our guide to curbless walk-in showers and in 5 signs it's time to remodel your bathroom.

5. Make them own the permits

Most real bathroom remodels need a permit once the work touches plumbing, electrical, or ventilation. The contractor should file, schedule the inspections, and attend them.

Be wary of anyone who suggests skipping the permit to save time. Unpermitted work surfaces at resale, can complicate an insurance claim, and leaves you holding the liability — not them. Our Bay Area remodel permit guide covers the usual triggers.

Note that permit fees should be a line item in the quote, not folded into an allowance.

6. Compare quotes on scope, not on the bottom number

Three quotes at wildly different prices usually are not three prices for the same job. They are three different jobs.

Put them side by side and compare what is actually specified: the waterproofing system, the fan, the valve brand, whether the electrical is being brought up to current code, whether the quote includes demolition, disposal, protection of the rest of the house, and final clean. The cheapest quote is often the one that left the most out — and the difference reappears later as change orders.

7. The questions that tell you the most

• Who is actually on my job each day — your employees, or subcontractors you have not met?
• What is your workmanship warranty, in writing, and what voids it?
• How do you handle a change order? Do I approve cost before work proceeds?
• Can I talk to a client whose project went sideways, not just one that went well?

That last one is the most revealing question on the list. Every contractor has a project that went wrong. The ones worth hiring will tell you about it.

Bathroom remodeling contractor FAQ

How do I check if a California contractor is licensed?

Use the Contractors State License Board's free lookup at cslb.ca.gov. Enter the license number to see whether it is active, which classifications it covers, workers compensation and bond status, and any disclosed complaints.

How much deposit can a contractor ask for in California?

On a home improvement contract, the down payment is limited to 10% of the contract price or $1,000, whichever is less. A larger upfront demand is a reason to pause and ask why.

Do I need a permit for a bathroom remodel?

Usually yes, once the work touches plumbing, electrical, or ventilation. A cosmetic swap may not. Your contractor should file the permit, schedule inspections, and attend them, with the fees itemized in your quote.

How many quotes should I get?

Enough to compare scope meaningfully — usually two or three. The value is not in finding the lowest number; it is in seeing where the quotes disagree about what the job actually includes.

What should a bathroom quote specify?

Named products rather than open allowances, the waterproofing system, the fan and where it vents, the payment schedule tied to milestones, a written change-order process, start and completion dates, and the workmanship warranty.

Planning a bathroom in the Bay Area?

CFCC is based in Pacifica and holds California contractor license CSLB #1103846. We do a free in-home consultation, then put one fixed written price in your hands within seven days — permit fees itemized, no open allowances.

Book a consultation, see how we approach bathroom remodeling, or read what a bathroom remodel costs in the Bay Area.