The City of Livermore permits ADUs across most residential zones. Livermore 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.

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

• Detached ADU: Separate building from the main residence
• Attached ADU: Added onto the main home
• Conversion ADU: Converts some of a current 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 1,200 sq ft
  • Attached: Up to 50% of the primary dwelling’s size, max 1,200 sq ft
• Setbacks:
  
  • Minimum 4 ft from rear and side property lines
• Height Limits:
  
  • Typically 35 ft unless
• 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 Livermore, the following approvals are typically required:

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

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

Permit times are usually 4 to 6 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 Livermore's ADU process can help make approval easier.

Accessory dwelling units shall be a permitted use in any district where residential uses are permitted. Junior accessory dwelling units shall be permitted in the 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 Livermore.