We have had an offer accepted on a house and the vendors have started putting an extension on the back. At the moment there are rsj beams in view and an internal door as a back door. The house has a good bathroom and a kitchen of sorts. It would be possible to live in the house as long we replaced the back door. Would the fact that the vendors have started the extension be a problem when getting a mortgage? Does anybody know if there are some lenders more likely to give us a mortgage?