Your first port of call should be to your solicitor to make certain that an unconditional contract is in place. If so, then normally this deposit is non-refundable, but in circumstances where for example the price of houses in the area has gone up since you bought off plan a developer might just allow you to bow out of the contract with none or minimal expense. So your second port of call is to contact the developer directly. Of course, if the price of houses has indeed gone up, you might consider subselling your interest in the house, which might net you a profit ( subject to CGT) or indeed holding on until completion and then selling.