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ADU Development StandardsADU Programs and ResourcesHousing Programs and Resources 

Accessory dwelling units (ADUs), also called second units, granny units, casitas, or cottages, are allowed in all residential zoning districts where single family residences are allowed to promote the goal of affordable housing within the City. The Accessory Dwelling Units Ordinance has the regulations and guidelines for this type of development.

The Cupertino Planning Department will help ensure your project proposal complies with the zoning code and development standards. Feel free to email preliminary plans/queries to  

A building permit is required to build an ADU. Visit the Cupertino Building Permit Center for hours of operation and contact information or email

 Please see our ADU Handout for FAQs and other important information regarding ADUs.   

 ADU Handout Thumbnail, Informational Sheet Image

Please visit to view the City's ADU development standards.

Floor Area for purposes of ADUs
What is a JADU?