Are there size limitations for an ADU?

Yes. An ADU can be no larger than 900 square feet. However, if an attached ADU (“accessory suite”) occupies the entire basement of a home, then it can be up to 1200 square feet. There is no minimum size for an ADU.

The maximum height for an ADU is the same as that for any other dwelling allowed in the zone.

ADU (Accessory Dwelling Unit) Application (PDF) - LINK NOT FOUND