Santa Clara ADU Standards
Santa Clara ADU Standards: Your Guide to Successful ADU Development
Building an Accessory Dwelling Unit (ADU) or Junior Accessory Dwelling Unit (Jr. ADU) in Santa Clara? This guide outlines key development standards to help you navigate the process efficiently and successfully.
Zoning and Lot Size:
ADUs provide independent living spaces for a variety of uses, such as affordable housing, rental income, or downsizing. They contribute to Los Altos’ housing goals by increasing the overall housing stock.
Size and Floor Area:
- ADU:
- Maximum Size: 1,200 sq. ft.
- If attached: Must not exceed 50% of the primary dwelling size, with a minimum size of 800 sq. ft.
- No ADU may exceed 1,200 sq. ft., regardless of the size of the primary dwelling.
- Jr. ADUs:
- Maximum Size: 500 sq. ft.
Design and Layout:
- ADUs: Must include independent living, sleeping, eating, cooking, and sanitation facilities, including a full kitchen and bathroom.
- Jr. ADUs: Must be contained within an existing single-family home or ADU, with a separate entrance and its own kitchen. The bathroom may be shared with the primary dwelling.
Setbacks and Height:
- ADUs:
- Front setbacks follow zoning for residential units, with at least 4 feet from side and rear boundaries.
- Maximum Height: Same as the primary dwelling, or 16 feet if the ADU doesn’t meet setback requirements.
- Jr. ADUs:Same setback and height rules as ADUs.
Parking Requirements:
- ADUs: One parking space is typically required, unless exempt under Senate Bill 13. Replacement parking is not required for garage conversions.
- Jr. ADUs: No parking is required.
Owner Occupancy:
- ADUs: Owner occupancy is not required.
- Jr. ADUs: Owner occupancy is required.
Additional Key Standards:
| Feature | ADU | Jr. ADU |
|---|---|---|
| Primary Residence | Yes | Yes |
| Ministerial Planning Approval & Permits |
Yes | Yes |
| Water & Sewage Requirements |
Yes | Yes |
| Maximum Size | 1,200 sq. ft. (or 50% of primary dwelling size) | 500 sq. ft. |
| Maximum Height | 16 feet (unless meeting residential setbacks) | 16 feet (unless meeting residential setbacks) |
| Setbacks | Front setbacks determined by zoning; 4 ft. side and rear | Front setbacks determined by zoning; 4 ft. side and rear |
Other Considerations:
- Lot Size: There is no minimum lot size to construct an ADU. However, smaller lots may have restrictions on ADU size.
- Converting Existing Structures: Any structure conversion must be properly permitted. If expanding beyond 150 sq. ft., the expansion must meet setback and building code requirements.
- HOA or Deed Restrictions: Under California state law, HOA rules or deed restrictions that prohibit ADUs are void, though some restrictions may apply if they don’t significantly increase costs or feasibility.
Ready to Build Your ADU in Santa Clara?
Let LiveLarge Home guide you through the process. With expertise in design and construction, including pre-approved plans and prefab options, we ensure your ADU meets local zoning and building codes. Reach out to the Santa Clara Planning Department for detailed information on local regulations, or consult with our professionals to help navigate your ADU journey. Start today and add value to your property with a well-designed, efficient ADU!
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