Housing: accessory dwelling units. All About ADUs. Accessory dwelling units are small homes that exist on the same property lot as a single-family residence. (As the image depicts and the linked article explains, ADUs come in many shapes and styles.)
Protected Use Accessory Dwelling Unit (PADU). Located in the principal dwelling or in a separate building. AGFA is less than one half of the AGFA of the principal dwelling, or 900 square feet, whichever comes first.

Accessory Dwelling Units (ADUs) are also known as auxiliary apartments, granny flats, and secondary suites. An ADU is a residential dwelling unit that is proportionately smaller than other family residences on the same single-family home property.
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What is a JrADU? As set forth in California Government Code section 65852.2, an Accessory Dwelling Unit (ADU) is a smaller (detached or attached) secondary dwelling unit with complete, independent living facilities (kitchen, bathroom, and access)...

An Accessory Dwelling Unit (ADU) is a self-contained living unit that is usually smaller than the main home on the same property. It contains a kitchen, bathroom, and a place to sleep. They can be attached to the main home or a separate detached building.
PROS & CONS of Accessory Dwelling Units (ADUs). As the popularity of ADUs is steadily rising, homeowners are advised to do their homework before they decide to create an ADU in their backyard.