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ADUs have gone by many names, including granny flats, in-law units, and secondary units. By definition, an ADU is a self-contained, additional housing unit, on a permanent foundation, that contains a kitchen, bathroom, and a place to sleep. ADUs range in size from 150 square feet for a studio to 1,000 square feet for a unit with multiple bedrooms.
Like an ADU, a Junior Accessory Dwelling Unit (JADU) is an additional housing unit on a residential property. JADUs are limited to a maximum of 500 square feet in size and must be contained within the walls of an existing or proposed home. JADUs require an efficiency kitchen, and may share a bathroom with the main house or include their own bathroom.