I had an offer accepted on a house three weeks ago. There's no chain as the current owners of the house are moving in with their parents and we are currently renting. We have to give two months notice to leave our rented house and DH thinks we should wait until contracts have been exchanged before we give notice. I'm worried that is going to add an unacceptably long time on to the process of buying a house. We can't afford to pay both rent and mortgage for a month or more if there's a long overlap.