No law says that you can legally waive the limit. The law was designed to protect consumers. A contractor inducing a consumer to waive the limit is an act against public policy and violates the license laws. Of course, only the consumer and the contractor would know. As long as they maintain good relations, contractor's violation will not be known to CSLB.
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Please see my response to your simmilar query.
How does waiving this statute expedite anything? The contractor is supposed to be adequately financed so as to be able to pay for materials and labor, so when the customer pays the contractor shouldn't make any difference to getting the job done.
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If you are referring to a home improvement contract (as opposed to a commercial construction contract), you cannot waive California Business and Professions Code Section 7159.5. Section 7159.5 applies to all home improvement contracts. Specifically, subdivision (3) provides that if a downpayment will be charged, the downpayment may not exceed one thousand dollars ($1,000) or 10 percent of the contract amount, whichever is less.
There should not be any reason to waive this requirement because the contract can, in the schedule of payments, call for immediate payment for work or services to be performed and any materials and equipment to be supplied so long as it does not exceed the value of the work performed or material delivered.