It all depends on your credit history. If you have a substantial history of good credit management, one new hard pull will probably not be a problem. However, it sounds like you are trying to purchase your first house. If this is the case and you don't have a LONG credit history, the additional hard pull might cause a lender to take a second look. They don't really understand how you manage your money - just that you probably have additional credit line which could cause you to overextend yourself.