ADUs are small self-contained living spaces designed to provide additional housing on a single-family property. They are also commonly known as in-law units, granny flats, or backyard cottages. ADUs can vary in size and layout, but must include a separate entrance, kitchen, bathroom, and living area. There are several types of ADUs:

1. Detached ADU: A separate structure that is not attached to the primary residence.
   
   
2. Attached ADU: A separate living space that is attached to the primary residence, extending the existing footprint of the home.
   
   
3. Garage conversion: This can be either attached or detached from the primary residence.
   
   
4. Basement conversion