Cupertino CA ADU Guidelines

Accessory Dwelling Unit (ADU) City Regulations



Lot Size:

Detached: lots greater than 10,000 sq.ft.

Attached: lots smaller than 10,000 sq.ft. (however, it may be detached if the proposed architecture, colors, materials etc. consistent with main house).

Maximum ADU Floor Area:

Min. 150 sq.ft. and limited to 10% of net lot area up to 1,000 sq.ft., or 50% of existing living space of main dwelling, whichever is more restrictive.

Number of Bedrooms:

No min/max, but must follow allowable density guidelines of lot.


No min/max


Require separate bathroom and kitchen facilities (permanent range, counters, refrigerator and sink).


Require no additional parking, otherwise must have additional parking space onsite if less than minimum off-street parking spaces available for the main house.  Parking exceptions apply.


Front: 20' in residential zones, 30' in agricultural zones.

Rear: 3'

Side: interior 3', street side on corner 15', street side on corner adjacent to key lot 20'.


Attached:  Limited to first floor.

Detached: 20' limited to 1 story.


Must follow guidelines of underlying zone.

Rear Yard Coverage:

30% Max


ADU to be consistent with existing general plan and zoning land use designation for lot.


Independent outdoor access must be provided without going through the principal dwelling. Where second-story ADU allowed, entry shall not be provided by exterior staircase. All access to ADU to be screened from public street.

For more ADU information:


WordPress Theme built by Shufflehound.

Copyright © 2019-2020 California Modulars, LLC. All rights reserved | Inc.

California Modulars serves Silicon Valley and the entire Northern California and the surrounding areas of Campbell, Cupertino, Los Altos, Los Gatos, Menlo Park, Palo Alto, San Jose, Santa Clara, Saratoga, Oakland, San Francisco, Sacramento, Daly City, Berkeley, Morgan Hill, Dublin, Union City, Hayward, Milpitas, Fremont, Morgan Hill, Santa Cruz, Redwood City, San Bruno, San Mateo, Santa Rosa, Sonoma  County & surrounding areas of Bay Area, Northern California.

Order a Feasibility Study

Do NOT follow this link or you will be banned from the site!