Legal Question in Construction Law in California

Nope. You can't abandon a contract that was never formed. Unless it is a complete bid package with all contract terms included, such as bidding on public contracts, or the contractor's bid form is also a contract form to be accepted and completed just by the customer signing it, a bid is nothing but a statement of interest in entering into a contract at a certain price. If there is no actual contract prepared and agreed on, there can be no abandonment of a contract.