This is a question we tick off right at the start of the process with our clients. A Mortgage Offer is the lender granting you the funds towards the purchase, but a lot, if not all, do have a specific period of time that this will last for. Typically, with high-street lenders this can last for around 6 months on a standard home purchase. If you’re buying a new building and the development takes a little longer, some lenders will actually allow your mortgage offer up to 9 and in some cases 12-months before it runs out.So it gives you plenty of time from the moment a mortgage offer is approved to make sure the rest of the home-buying chain can get sorted too.