The City of San Pablo permits ADUs across most residential zones. San Pablo 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.

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

• Detached ADU: Separate ADU detached from the primary dwelling
• Attached ADU: ADU attached to the primary dwelling
• Conversion ADU: Converts part of an existing house or accessory structure (e.g., garage) into an ADU
• Junior ADU (JADU): Up to 500 sq. ft., converted from part of the home, may share a bathroom with the main home

• Maximum Size:
  
  • Detached: Up to 800 sq. ft. (new construction), can go up to 1,200 sq. ft. depending on lot size
  • Attached: Up to 50% of primary dwelling, max 1,200 sq. ft.
• Setbacks:
  
  • Minimum 4-foot setbacks from the rear and side property lines
• Height Limits:
  
  • Typically, ADUs are allowed up to 16 feet in height unless otherwise specified by local zoning or special circumstances 
• Parking Requirements:
  
  • Additional parking is not required if the ADU is:
    
    • Conversion ADU or Junior ADU (entirely within the existing primary residence or accessory structure)
    • Located within ½ mile of public transit
    • Situated within a historic district
    • Within one block of a car-share service

To build an ADU in San Pablo, the following approvals are typically required:

• Zoning Compliance Review: Confirm the property is in compliance with the local zoning laws.
• Site Plan and Elevations: Provide detailed plans showing the ADU’s layout and elevations
• Architectural Drawings: Submit complete architectural plans outlining design and construction
• Structural Calculations and Engineering: Include engineering reports demonstrating structural stability
• Title 24 Energy Documentation: Provide documentation showing compliance with California’s energy efficiency code
• Permit Submission: All necessary documents should be submitted via the City of San Pablo's online portal, MGO Connect
  

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

Permit times are usually 6 to 12 weeks depending on the complexity of the project and workload in the city. Some simple projects can be expedited, whereas those with corrections or requiring additional information may take longer. Having experts familiar with San Pablo's ADU process can help make approval easier.

Accessory Dwelling Units (ADUs) Permitted in any district where residential uses are allowed. Junior Accessory Dwelling Units (JADUs) Permitted in single-family zoning districts within an existing single-family residence or as part of a proposed single-family residence.

For the most current and complete information, refer directly to the City of San Pablo.