California Contract Rules That Surprise Newcomers

Most of what people know about hiring a contractor turns out to be state-specific, and California is stricter than most. If you have remodeled a bathroom somewhere else, several of the rules below will be new. They are worth knowing before a contract is in front of you, because they are the parts a well-run local firm has already built into its paperwork.

The deposit is capped at $1,000, whatever the project costs

This is the one that surprises people most. Under Business and Professions Code section 7159.5, a down payment on a home improvement contract may not exceed $1,000 or ten percent of the contract price, whichever is less, with finance charges excluded from the calculation.

Read that again, because the “whichever is less” does the work. On a $9,000 shower conversion, ten percent is $900, so the cap is $900. On a $70,000 primary suite, ten percent is $7,000, but the cap is still $1,000. The rule does not scale.

The statute is specific enough that the contract itself has to carry the sentence in twelve-point bold type. If a contract in front of you asks for twenty or thirty percent up front, that is not a negotiating position, it is outside the law.

What it does not mean is that a contractor floats the whole job. Payments after the deposit track completed work, and on a bathroom that means a schedule of progress payments tied to demolition, rough-in, waterproofing, tile and completion. What a contractor may not do is take payment that exceeds the value of what has been done.

A written contract is required above $500

Different number, different purpose, and the two get conflated constantly. Once the aggregate price of a home improvement job passes $500, the contract has to be in writing, and the statute lists what it contains: the contractor’s name, address and license number, an itemised price, a description of the work and materials, the deposit and progress payment terms, approximate start and completion dates, the change order process, insurance and workers compensation status, and a mechanics lien warning.

The separate $1,000 figure comes from section 7048 and has nothing to do with contracts at all. It gets quoted at homeowners as though it were the written-contract threshold, and it is not. The number to remember for a bathroom is $500, and it was $500 before the other figure moved to $1,000 on 1 January 2025.

Three days to cancel, five if you are 65 or over

A home improvement contract carries a three business day right to cancel, and the notice has to appear in the contract itself. For a homeowner aged 65 or over the period is five business days. Cancellation is in writing.

This matters most for anyone who signs at the kitchen table at the end of a long presentation. The cooling-off period exists precisely so a signature given under momentum can be withdrawn calmly the next morning.

A mechanics lien can attach even if you have paid in full

This is the least intuitive rule in California residential construction. If a general contractor is paid in full but does not pay a subcontractor or a supplier, that subcontractor or supplier can record a mechanics lien against your property. You can pay for a bathroom twice.

Because the exposure is real, the warning is mandatory contract language rather than boilerplate. The practical protection is unconditional lien releases: as each progress payment goes out, the subcontractors and suppliers paid from it sign a release. On a bathroom with three or four trades and a couple of material suppliers, this is a small amount of paperwork and the only reliable defense.

The change order clause is the one that gets used

Of everything the statute puts in the document, the change order process is the clause most likely to matter on a bathroom, because something is behind the wall. There always is.

A change order is a written amendment covering work outside the original scope, priced and agreed before that work goes ahead. That sequence is the whole point. A wet subfloor found under an old shower pan is a normal discovery and a normal cost. The same discovery, priced after the fact and presented on the final invoice, is an argument.

Worth agreeing at the walkthrough rather than at the moment it happens: who has authority to approve one, whether it needs to be signed or an email will do, and how the schedule moves as well as the price. A contractor who already works this way will have an answer ready.

What this looks like in practice

None of this is exotic, and none of it is adversarial. A properly written California home improvement contract for a bathroom contains a scope, an itemised price, a $1,000 deposit, a progress payment schedule tied to completed work, dates, a change order process, the license number and the statutory notices. That is simply what the document looks like here.

If you want the rest of the picture before anyone prices your bathroom, the Mountain View remodel guide covers the project end to end, and the timeline guide covers how long each stage takes.