Everything about building Accessory Dwelling Units in Cupertino, CA
Check your property's zoning, browse designs & get contractor estimates for your ADU project:
City Hint: The City of Cupertino permitted a total of 19 ADU projects in the past year of 2020.
Number of ADUs allowed:
Two units are allowed if one is a JADU and one is a detached 800 s.f. ADU
Multifamily units: The greater of:
25% of existing dwelling units or one ADU
up to two detached ADUs
Types of ADUs allowed:
Detached ADU, Attached ADU, Junior ADU are allowed. Accessory Dwelling Units may be new construction or converted from existing space. Junior ADUs must be converted from existing space.
Lot size:
Single family and multi-family residential properties will not be subject to the minimum lot size of the underlying zoning district or by ordinance for Accessory Dwelling Unit projects. ~ AB-68
ADU size:
Single Family: 1 bd: 850 s.f.
2+ bd: 1,000 s.f.
Must meet Floor Area Ratio and Lot Coverage
Multifamily Detached: 1,200 square feet
Setbacks:
Front per underlying zoning
Rear and sides 4 ft
Parking:
Replacement parking shall not apply to lots which convert an existing garage to an Accessory Dwelling Unit or Junior Accessort Dwelling Unit (JADU). ~ AB68 & AB881 Update
Fire Safety:
Per state minimum requirements.
Shape, materials and style:
Proposed architecture, colors, materials, etc. must be consistent with the main house.
Height:
Conversion: Per underlying zone, no increase
Detached: 16 ft
Design review:
Ministerial review process per state standards.
Number of Bedrooms:
Not specified by State Standards.
Ownership:
Owner-occupancy will not be required for new ADUs (conversion and new construction) built between 2020 and 2025. ~ SB13 Update
Utility connections:
Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)
Entry:
Must have direct outside access without going through the principal dwelling and entrance must be screened from a public street.
Allowed Zones:
*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***
Residential Building Code:
The California Building Code (CBC) 2019 is adopted.
Cupertino Planning & Zoning
10300 Torre Ave, Cupertino, CA 95014 Cupertino, CA 95014
ADU Design Library
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700 sf
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