Not only can an ADU, a.k.a. garage apartment, in-law suite, and granny flat, make your flip property more appealing to potential buyers, it can greatly increase its value. Homes with an ADU are listed an average of 35 percent higher than residences without one, says home improvement website Porch.com. An ADU, or accessory dwelling unit, is separate from the main home on a property and is located on the same lot. It can also be located within the main home, as long as it functions as a separate unit. Homeowners with ADUs can house aging family members, or earn extra income by renting out their