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ADU Development StandardsADU Programs and ResourcesHousing Programs and Resources 


Accessory dwelling units (ADU, also called secondary dwelling units or granny units, are allowed in certain residential zoning districts to promote the goal of affordable housing within the City in a manner which minimizes adverse impacts of ADUs on neighborhoods. 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.  

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

ADU Presentation to Housing Commission May 16, 2019

Proposed Municipal Code Amendment Affecting ADUs (MCA-2018-04) 

The 2018-2019 City Work Program listed under its Community Livability and Sustainable Infrastructure section a project to incentivize the building of Accessory Dwelling Units (ADUs). In accordance with the City’s Housing Element, the increased supply of these types of units provide affordable housing opportunities that meet the City’s Regional Housing Needs Allocation (RHNA) for moderate level housing. Staff’s specific task was to review the CMC and recommend incentives to encourage the development of ADUs. This included, but was not limited to, considering reduction in fees and modifications to development standards.

At this time, revisions have been identified to Chapter 19.112 – Accessory Dwelling Units. 

The recommendations include eliminating the 10% net lot area size restriction for maximum ADU size. All other ADU development standards (setbacks, lot coverage, height, etc.) are recommended to remain. 

Planning Commission Hearing Date

June 11, 2019 (Tuesday) at 6:45 p.m.

Tentative City Council Hearing Date