Each city and unincorporated Alameda County have their own specific rules that govern ADUs. Keep in mind that if you don't live inside the city limits of an incorporated city, then your jurisdiction is Alameda County. 

Click on the links below to learn about the local rules that govern ADUs where you live. Once you’ve determined what you’re eligible to build, contact local staff to double-check your assumptions and get clarity on rules.

Note: Confirm all details with local staff while planning your ADU.