An accessory dwelling unit (ADU) is a legal and regulatory term for a secondary house or apartment that shares the building lot of a larger, primary house. The ADUs are accessory structures and cannot be subdivided to an independent dwelling unit. Usually the ADUs can be designed and built to a portion of the primary building structure. Due to their size they are used by one or two people and often can be used as an office space with the possibility of renting for additional income.


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