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 licence 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 is about licensing, not contracts. It exempts small jobs from needing a licensed contractor at all, but only where the work is minor, needs no permit, has no employees involved and is not part of a larger project. Since essentially every bathroom remodel requires a permit, the exemption almost never applies to this kind of work. The threshold was raised from $500 to $1,000 effective 1 January 2025 and is still $1,000.

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 defence.

Licence, bond, insurance

California licensees carry a $25,000 contractor licence bond, an amount that took effect on 1 January 2023. Workers compensation is required for any contractor with employees. General liability insurance, perhaps surprisingly, is not a state licensing requirement, though established remodelers carry it as a matter of course and the contract has to state the position either way.

A licence can be checked in about a minute on the Contractors State License Board register, which shows classification, status, expiry, bond, workers compensation coverage and complaint history. Licence numbers are numeric and up to eight digits, which is itself useful: a “licence number” with letters in it is not a CSLB number.

For a full bathroom remodel the relevant classification is a Class B general building licence, because the work spans several unrelated trades. A single-trade job is different: tile alone calls for a C-54, plumbing alone for a C-36.

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 licence 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 permit guide covers what the city requires.