Who wins this case and what are the rules of law involved.

Harry hired Gables Contracting to build an addition to his house for $20,000. The work contract stated that, "all work is subject to the owner's satisfaction." When the addition was completed, there was no question that the work was done in accordance with industry standards. Nevertheless, Harry refuses to pay because he didn't like the work. Gables Contracting sued to collect the contract price. Who wins and why?