It's probably the biggest expense you'll ever make. Buying a house. And to be able to afford that house, you have to take out a good mortgage. Or maybe you already have a mortgage and are looking for ways to save extra money. In both cases, there is good news. In this article, we tell you how you can save on a new mortgage, but also how you can save money on an existing mortgage.  1. Save on a New Mortgage Are you going to take out a mortgage? In that case, these first 5 tips...