When looking to increase usable square footage, many homeowners look up to the attic or down to the basement. One room, however, is better left untouched: the garage. Although converting the garage may fill an immediate need, it could hurt resale value in the long run. Most buyers are looking for a house with a garage, not just a driveway. So, unless you plan to build another garage to house your vehicles, skip the renovation (and the extra living space), and look forward to a smoother selling experience in the future.