I have two questions for you. First, are you lucky enough to have a lower level offering extra multi-functional living space? Second, are you making the most of it to impress buyers? Probably not, home experts say. If you’re not thoughtful about your basement layout and its uses, it won’t actually add much value to your property. Here are six common mistakes you may be making when it comes to making the most of basements, and what to do instead.