Depending on the builder, you just may be in luck. Two of my clients are currently purchasing new homes (one in Phoenix, one in Queen Creek). In both instances, we were able to reach accord with the builder on additional price concessions after the contract was signed. Most builders are holding onto their buyers with both hands right now. So while you are not contractually owed anything, and bound to the terms you agreed to, the builder might be willing to play ball if it means saving a sale. If you are being represented by a REALTOR, this is where he/she can really help you. If not, simply approach the builder with your dillema. I find that the best tact is to simply lay out the fact that you want to continue with the purchase, but do not see how you can with the current circumstances. You should make the initial contact on the matter with the sales office, but you will likely need to go up the chain of command to reach a decision maker. Best of luck with both the buying and selling process.