Before deciding you want to build a giant ADU, you should be aware of the ADU guidelines surrounding its size and height.

ADU Size Limitations

A common ADU development mistake is planning for an ADU that will exceed LA size limitations. Individuals also do not always realize how big they can go and end up trying to squeeze too much into a small design.

To avoid this problem, we have laid out the different size requirements of different types of ADUs for you.

Building an Attached ADU

An ADU that is attached to the home can only be 50% of the size of that main home. Depending on the size of your home and lot, this means you could have a rather large ADU.

Building A Detached ADU

A detached ADU is not dependent on the size of the main home. As an independent unit, it can be up to 1,200 square feet. The size of your lot may constrict your ability to build one this big though.

ADU Height Requirements

Along with size requirements, there are also height limitations to be aware of.

Height of ADUs Within Existing Buildings

People are not always aware that they can build ADUs within their already existing homes or buildings. These ADUs can be as tall as the maximum height of the existing structure. They are not limited by any universal height requirements.

Height of Other ADUs

ADUs that are not within the home must be less than 16 feet tall generally. There are some exceptions to this, so if you want to build one taller you should take a deeper look into the height regulations for your community and consult your local government. Generally, though, 16 feet seems to be the maximum height.

How Many ADUs Can You Build?

In LA, you can build two ADU’s on your property given you have the space, and they meet the above regulations.

One ADU can be a full-size unit. The other unit is called a Junior Accessory Dwelling Unit (JADU) that is smaller and attached to the main building.