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What is an ADU?

An ADU stands for "accessory dwelling unit" and is a small, self-contained living unit on the same property as a single-family home. It is sometimes called "granny flat," "in-law unit," or "secondary dwelling unit."

Traditional California house with an ADU in the back of the property lot

An ADU can be a detached structure, such as a guest house or a converted garage, or a part of the main house, such as a basement apartment or a converted attic.

ADUs are often smaller than the primary unit and are usually intended as a rental unit, a home office, a guest house, or a home for an aging parent or adult child.

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