Cupertino ADU Standards: LiveLarge Home Guide
Since implementing its ADU regulations, Cupertino has seen a rise in accessory dwelling unit development. If you’re looking to build an ADU in Cupertino, LiveLarge Home is here to help you navigate the essential standards for a successful project.
Types of ADUs:
- Attached ADUs: Extensions or conversions of existing structures.
- Detached ADUs: New, independent buildings.
Zoning and Lot Size: ADUs are permitted in R-1, RHS, A, and A-1 zoning districts. There’s no minimum lot area requirement.
ADU Size:
- Minimum: 150 sq. ft.
- Maximum: Either 10% of the lot area (up to 1,000 sq. ft.) or 50% of the primary dwelling’s size, whichever is smaller.
Height Regulations:
- Attached ADUs: Must stay within the existing structure.
- Detached ADUs: Limited to a maximum height of 20 feet (one story).
Setbacks:
- Attached ADUs: No setbacks required, except for fire safety regulations.
- Detached ADUs: Follow the same setbacks as the main residence—minimum of 3 feet from side/rear, 20 feet from the front, and 30 feet in A Zones. At least 5 feet from the primary dwelling is required.
Second-Story ADUs: Permitted only if they are conversions and meet landscape requirements; otherwise, they are not allowed.
Lot Coverage:
- Attached: No additional coverage since they must remain within the existing structure.
- Detached: Limited to the same coverage as the primary residence, capped at 30% of the usable rear yard.
Parking Requirements:
- ADU Parking: No additional space required if:
- Located within ½ mile of public transit.
- In a historic district.
- No on-street parking permit is available.
- Within one block of a car-share location.
- Replacement Parking: Required if existing spaces are converted; can be configured in various ways on the same lot.
Entryways: Must provide independent exterior access. Second-story ADUs cannot utilize exterior staircases. All entries must be screened from public view.
For more detailed information or specific guidance, reach out to local zoning officials or consult with a LiveLarge Home ADU expert. Let us help you transform your property with a thoughtfully planned ADU today!
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