7 Smart ADUs and Additions That Cost as Little as $18K

Whether you’re in need of a guesthouse, art studio, home office, yoga practice space—or all of the above—a home addition or backyard ADU can do the trick. These multifunctional spaces open up new possibilities in lifestyles and living arrangements, and don’t necessarily have to break the bank. Ranging from $18,275 to $248,658, the clever projects below break down the costs of carving out some additional room.