This isn't your first flip, but it is the first time you've thought about adding some square footage to your house, which is a little on the cozy side. As you weigh your options consider the typical costs of horizontal and vertical home additions, which we’ve highlighted below, to see how expanding your home may impact your budget. (Be aware that labor and supply expenses can vary by region). Expanding the Footprint  If you want to expand your flip horizontally (expand its footprint) it can be cheaper than building vertically. It'll cost you between $150 and $200 per square foot, on