The size of an attached ADU in Los Angeles is not allowed to exceed 50% of the primary residence up to 1,200 square feet, while the minimum ADU size is 150 square feet.
However, detached ADUs can be up to 1,200 square feet no matter the size of the main home. There must be at least one room that is habitable in an ADU that is a minimum of 70 square feet, with a minimum of 30 square feet for the bathroom, and 50 square feet for the kitchen. When ADU is parking is required, there must be one parking space provided for single bedrooms and two spaces provided for two or more bedrooms. However, ADU parking is not always required, such as when the ADU is located within half a mile of public transit.
The ADU needs to be visually compatible with the primary home, as well as the general neighborhood.
No minimum lot size is required for an ADU, though you will have to refer to local building code for height restrictions. Except for special circumstances, the height of an ADU should not exceed 25 feet. Both the primary residence and the ADU are able to be rented by the homeowner at the same time, as there isn’t an owner occupancy clause. However, the ADU is not allowed to be sold independent from the home.
In order to have your Los Angeles ADU project approved for construction, you will need to follow all of the rules and regulations and submit all paperwork to the appropriate departments prior to the start of construction.