How long does it take to buy a house? It will take much longer if you make mistakes at the beginning. Even if you are able to accomplish it fairly quickly, these mistakes could cost you in other ways, such as discovering you paid way too much or finding problems with the house that now need repairs. They aren’t newbie mistakes at all – in fact, even experienced home buyers could make them. The key is to know what to look for and be prepared. These are the five mistakes you should avoid before you buy a house – and what you should do instead.