What is an
California cities are looking for ways to bring new housing units online quickly and affordably. Compared with new single-family homes and large multi-family housing projects, ADUs are affordable to build because their construction does not require paying for land or building structured parking or elevators. In addition, ADUs are typically built as one- or two-story wood frame dwellings that do not require major new infrastructure upgrades, thus reducing overall construction costs. ADUs also offer benefits to residents, such as supplemental income from unit rent and the ability to house members of the extended family.