California ADU Information

Visit Symbium, your free,
one-stop resource for ADUs in California.
Learn instantly if you can have an ADU on your property, find and sketch ADU designs that fit your property and your needs, connect with ADU professionals, and get your free report with all the information you need to get started.

Introduction to ADUs

ADUs are known by many names — including accessory dwelling units, second units, in-law units, granny flats, backyard homes, and casitas. But, no matter what you call them, these are homes located on the same piece of property as another home.

ADUs are a great way for homeowners to add to California’s housing supply, house a caretaker or family member, and earn rental income. Plus, the California State Legislature recently passed legislation to make it easier than ever to build an ADU on your property.

To get detailed information about whether your particular property is eligible for an ADU and explore ADU designs that fit your property and your needs visit Symbium Build, your free one-stop ADU resource.

To learn more about ADUs in your area, select your city from the list below.

map of california
Map of California

California quick facts

Number of ADUs that received building permits in California in 2018 and 2019
Number of parcels located within the state
Percent of ADUs built in 2018 and 2019 were intended to be made available to renter
Number of transit stops located within California

California by the numbers

Average income in California
Average property value in California
Number of people who live in California