Unfortunately, since we assume you want to go through the transaction and get the house, one of the options when the other party keeps violating the contract--treating the contract as terminated and walking away from the transaction--is most likely not available.Given that, your main recourse, as a practical matter, is to sue your contractor for breach of contract after the closing, when you can  bring a legal action seeking compensation for 1 anything not completed i.e. suing for either the value of the work left undone, or for the cost to complete and for any other costs you incurred due to the failure to honor the contract and complete on time.