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(408) 752-5614 ext: 859
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Cupertino ADUs

Everything about building Accessory Dwelling Units in Cupertino, CA

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402 sqft
San Jose

292 sf

Cupertino ADU Guidelines Last Updated 09/24/21

The city government of Cupertino will approve ADUs under California's statewide mandated regulations.
The California Building Code (CBC) 2019 is adopted.


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


Front per underlying zoning
Rear and sides 4 ft


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.


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.


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)


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 City Planning Offices

Cupertino Planning & Zoning

10300 Torre Ave, Cupertino, CA 95014 Cupertino, CA 95014

Call/Text ADU Operator (408) 752-5614
Dial Ext: 859

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ADU Model 600 sqft

30 ft x 20 ft

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25 ft x 20 ft

ADU Model 782 sqft

34 ft x 23 ft

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