Transforming unused space in your basement can be the biggest change you can make to your house. You can easily add up to 50% or more square footage to your existing home, making an enjoyable living space for entertaining, kids play area or just for the entire family to relax. Other potential upgrades include adding a bar/kitchenette or a full or half bathroom. Installing an egress window will let in natural light as well as provide an emergency exit (now mandatory in all new construction).