The City of Santa Clara permits ADUs across most residential zones. Santa Clara follows both state and local ADU laws, allowing most single-family homes to build one detached ADU and one Junior ADU (JADU) per lot. Multi-family properties may be eligible for multiple ADUs, depending on site conditions.

Santa Clara aligns with California’s broader ADU legislation but has its own requirements for height, setbacks, and design review.

• Detached ADU: A free-standing unit separate from the main home, typically built in the backyard or side yard.
• Attached ADU: A unit that shares at least one wall with the main residence, such as an addition or extension.
• Conversion ADU: A unit created by converting existing space like a garage, basement, attic, or other internal area of the home.
• Junior ADU (JADU): Up to 500 sq ft, carved out of existing space within the home or attached garage, with a separate entrance and small kitchen.

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• Maximum Size:
  
  • Detached: Maximum of 1,000 sq ft.
  • Attached: 1,000 square feet or 50% of the size of the main unit, whichever is less.
• Setbacks:
  
  • Minimum 4 ft from side and rear property lines
• Height Limits:
  
  • Detached ADU: Maximum 18 feet for single story
  • Attached ADU:  Maximum 25 feet for 1.5 stories
• Parking Requirements:
  
  • Additional parking is not required if the ADU is:
    
    • Parking spaces do not need to be replaced if existing parking is removed when:
    • A garage, carport, or covered parking structure is demolished to construct an ADU/JADU
    • A garage, carport, or covered parking structure is converted into an ADU/JADU

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To build an ADU in Santa Clara, the following approvals are typically required

• Zoning compliance review to ensure ministerial approval standards are met
• Site plan showing locations, setbacks, and access
• Architectural drawings (floor plans, elevations)
• Structural calculations and engineering (for new construction)
• For Historically Designated Properties, a Significant Property Alteration (SPA) Permit is required.
  

Homeowners should also review Santa Clara’s current fee schedule, utility connection requirements, and fire code compliance.

Permit review times vary but are typically between 6 to 12 weeks depending on project complexity and city workload. Projects requiring corrections may take longer. Engaging professionals familiar with Santa Clara's ADU process can help streamline approval.

Most residential zones are eligible for ADUs, including single-family, multi-family, and mixed-use zones. There are no minimum lot sizes for ADUs in the City of Santa Clara. Some hillside areas or properties with designated easements may have special restrictions.

For the most current and complete information, refer directly to the City of Santa Clara.