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Not for an ordinary home improvement contract. Business and Professions Code § 7159.5 limits the down payment to $1,000 or 10% of the contract price, whichever is less, and bars payments that exceed the value of work done or materials delivered. CSLB notes an exception for contractors holding a Blanket Performance and Payment Bond, so check that before assuming a violation.

Yes. CSLB recommends stating who obtains the building permits and whether permit fees are included. Permit scope can also trigger required upgrades that should be priced in advance.

No. Cementitious grout is porous even when sealed. A shower stays watertight because of a membrane or pan liner behind and beneath the tile. If water reaches framing or a ceiling below, re-grouting does not identify the source; have plumbing, drain, enclosure and waterproofing checked.

Use the CSLB license check online. Confirm the license is active, the name matches your contract, the classification fits the work, and review the bond and workers' compensation information.

Not by itself. Sellers often repaint before listing. A patch below a bathroom or kitchen is a reason to ask what happened and to have the area tested. California sellers must answer disclosure questions in good faith.

No. City handouts such as Cupertino's and Pleasanton's say the panel may need upgrading based on verification. An electrician's load calculation, space check and condition assessment decide.