How Much House Can You Afford By: Tracy Phillips | Jun 3rd 2007 - There are several ways to gauge how much you can afford to spend on a house. But, before you go house-hunting, get pre-qualified for a mortgage so you'll know in what price range you can shop. It is not unusual for first-time buyers to be somewhat baffled about how to estimate what mortgage payment they will be able to handle each month, plus how much money they'll need for a down payment and closing costs.