Legally, ADUs are secondary houses or apartment spaces that share the property lot of a larger, primary house. Some common names for ADUs include secondary dwelling units, granny flats, or in-law units. They are innovative, affordable, and effective housing options. They are especially in demand in states where housing is expensive and limited, such as California. There are three main types of ADU’s. Internal ADU’s portions of homes that are transitioned to accommodate an extra person or two. Some examples: converted garages, basements, or even attics. Next, there are Attached ADUs. Attached ADUs are typically newly constructed rooms attached to the primary home. Attached ADUs, also known as addition ADUs or ‘bump-out ADUs’, People add a room (and usually a bathroom) so an extra individual could live inside the house. The final type are Detached ADU’s; a private and extremely functional stand-alone structure. Detached ADUs are extremely attractive to tenants because they are essentially tiny homes, usually boasting a small kitchen, bathroom, and a lounge area.