"YOUR RIGHTS TO CANCEL BEFORE WORK BEGINS
If you cancel, the contractor must return to you anything you paid within 10 days of receiving the notice of cancellation. For your part, you must make available to the contractor at your residence, in substantially as good condition as you received it, any goods delivered to you under this contract. Or, you may, if you wish, comply with the contractor's instructions on how to return the goods at the contractor's expense and risk. If you make the goods available to the contractor and the contractor does not pick them up within 20 days of the date of your notice of cancellation, you may keep them without any further obligation. If you fail to make the goods available to the contractor, or if you agree to return the goods to the contractor and fail to do so, then you remain liable for performance of all obligations under the contract."
Ca. Bus. and Prof'l. Code § 7159.10