City ADU planning guide

San Jose ADU regulations and next steps

Start with the most important planning decisions, then review the detailed city rules below before choosing a detached ADU plan or requesting a property-specific feasibility review.

San Jose ADU rules overview

Detailed local requirements vary by property. Use this section as a starting point for setbacks, parking, height, utilities, and approval considerations.

Lot fit

Setbacks and buildable area

Start with rear and side setbacks, lot coverage, access, and where a detached ADU can realistically sit on the property.

Design limits

Size, height, and unit type

Check whether the property is better suited for a detached ADU, attached ADU, garage conversion, or junior ADU.

Approvals

Parking, utilities, and permits

Confirm parking exemptions, utility connection requirements, impact fees, and city review steps before finalizing plans.

San Jose has been proactive in implementing regulations to encourage the development of Accessory Dwelling Units (ADUs).Here are some key points about ADU regulations in San Jose

Key Points:

  • Size Limits
    • Detached ADUs: Up to 1,200 square feet.
    • Attached ADUs: Up to 50% of the floor area of the main residence.
  • Height Limits
    • Detached ADUs: Typically, up to 2 stories or 25 feet.
    • Attached ADUs: Height is generally limited by the height of the main dwelling unit.
  • Setback Requirements
    • Detached ADUs: At least 4 feet from side and rear property lines.
    • Attached ADUs: Specific setbacks depend on the configuration and local zoning regulations.
  • Parking
    • Detached ADUs: One parking space is required unless the ADU is within 1/2 mile of public transit.
    • Attached ADUs: No parking is required for conversion ADUs and JADUs.
  • Lot Size No minimum lot size requirement.
  • Number of ADUs Typically, you can build one ADU and one Junior ADU (JADU) on a single-family lot.
  • JADU A JADU is a smaller ADU, typically within the main house, with a maximum size of 500 square feet.

Additional Considerations:

  • Zoning Regulations Check the specific zoning regulations for your property.
  • Building Codes
    • Ensure your ADU complies with local building codes.
  • Fire Safety Codes
    • Adhere to local fire safety regulations, especially for attached ADUs.
  • Consult with Professionals
    • Seek advice from a local architect or planner to ensure compliance.

Helpful Resources:

  • City of San Jose ADU Information
    • https://library.municode.com/ca/san_jose/codes/code_of_ordinances
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