How big can an ADU/JADU be?

  • A studio or one-bedroom ADU can be up to 850 square feet.
  • An ADU with more than one bedroom can be up to 1,000 square feet, except if it is attached to an existing single-family home. If attached to an existing single-family home, the ADU is limited to 50% of the size of the house. 
  • There is no size limit for converting an existing accessory structure, like a garage or shed, into an ADU.
  • A JADU can be up to 500 square feet and needs to be within the existing single-family home. 

Show All Answers

1. What is an ADU/JADU?
2. Can I have an ADU on my property?
3. How many ADUs can I have on my property?
4. How big can an ADU/JADU be?
5. Do I need to get a building permit for an ADU?
6. What are the setbacks for an ADU?
7. Can I convert my garage into an ADU?
8. What is the maximum height of an ADU?
9. Do I need to provide parking for the ADU?
10. Am I required to pay impact fees (e.g. sewer, water, school district) for an ADU?
11. Can zoning regulations, like the Hillside Height Overlay, prevent me from building an ADU?
12. Does my ADU have to match the design of my house?
13. Are ADUs allowed in high fire hazard areas?
14. What is the first step I need to take to get an ADU?