City ADU planning guide

Sunnyvale 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.

Sunnyvale 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.

Sunnyvale, CA, has specific ADU regulations that align with California state law but include additional local standards. Here's a detailed guide:

Types of ADUs Allowed:

  • Detached ADUs Separate structures built on the same lot as the primary residence.
  • Attached ADUs Units attached to the primary dwelling.
  • Junior ADUs (JADUs) Units attached to the primary dwelling.

Zoning and Lot Requirements:

  • ADUs are allowed in all zones permitting residential uses (e.g., R-1, R-2).
  • No minimum lot size is required for ADUs, in compliance with state law.

Size Limits:

  • Detached ADUs Up to 1,200 sq. ft. or 10% of the lot area, whichever is smaller.
  • Attached ADUs Maximum of 50% of the primary residence's floor area or 1,200 sq. ft., whichever is smaller.
  • JADUs Maximum 500 sq. ft.

Setbacks:

  • Front yard Must comply with primary residence setback requirements.
  • Rear and side setbacks Typically 4 feet for new construction.
  • No setback required for ADUs that are conversions of existing legal structures (e.g., garages).

Height Limits:

  • One-story ADUs Up to 16 feet.
  • Two-story ADUs Up to 18 feet. Additional height may be allowed in specific situations, such as near transit corridors or on sloped lots.

Parking Requirements:

  • No Parking Required
    • If the ADU is within ½ mile of public transit.
    • If located within an existing or converted structure (e.g., garage or accessory building).
  • Parking Options
    • If required, one parking space per unit or bedroom is needed, which can be tandem or in the driveway.

Owner-Occupancy:

  • For ADUs No owner-occupancy requirement for ADUs permitted between 2020 and 2025, per state law.
  • For JADUs The property owner must occupy either the primary residence or the JADU.

Design Standards:

  • Architectural Compatibility The ADU should match the primary residence in exterior design, materials, and roof slope.
  • Privacy Considerations Windows and entrances should be positioned to minimize impacts on neighbors.
  • Landscaping Screening may be required along property lines.

Utilities and Fees:

  • Separate utility connections are required for detached ADUs but not for attached ADUs or JADUs.
  • Impact fees are waived for ADUs under 750 sq. ft. For larger units, fees are proportional to the size of the ADU relative to the main home.

Permitting Process:

  • Streamlined Review Sunnyvale must approve ADU applications within 60 days if all requirements are met.
  • Required Documentation
    • Site plan showing lot layout and ADU placement.
    • Floor plans and elevations.
    • Proof of compliance with Sunnyvale’s zoning and building codes.

Additional Considerations:

  • Affordable Housing Incentives
    • Sunnyvale may offer incentives for ADUs rented at affordable rates.
  • Green Building Requirements
    • Compliance with energy efficiency standards, including solar panel requirements, is mandatory for new detached ADUs.
  • Pre-Approved ADU Plans
    • The city may have pre-approved ADU designs available, simplifying the approval process and reducing costs.

Next Steps:

  • Research Your Property
    • Use Sunnyvale’s zoning map to confirm your lot’s eligibility and requirements.
  • Pre-Application Consultation
    • Reach out to the Sunnyvale Planning Division for guidance on your project.
  • Plan Development
    • Engage a designer or architect experienced in ADUs to create compliant plans.
  • Plan Development
    • Include all required documents and pay necessary fees to the Planning Division.
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