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

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

• Detached ADU: separately from the primary structure
• Attached ADU: attached to the primary structure
• Conversion ADU: conversion of existing space within a primary residence or a detached accessory structure
• Junior ADU (JADU): Up to 500 square feet, contained entirely within a single-family residence

• Maximum Size:
  
  • Detached: Up to 850 sq ft (new construction), can go up to 1,200 sq ft depending on lot size
  • Attached: Up to 50% of primary dwelling, max 1000 sq ft
• Setbacks:
  
  • Minimum 4-foot setbacks from the rear and side property lines
• Height Limits:
  
  • Typically 18 ft unless
• Parking Requirements:
  
  • Additional parking shall be required if the accessory unit is located:
    
    • Within one-half mile walking distance of public transit
    • In an architecturally and historically significant historic district 
    • In part of a proposed or existing primary residence or an accessory structure
    • Within one block of a car-share pick up/drop-off location

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

• Zoning Compliance Review: Confirm the property is in compliance with 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 Richmond's online portal, MGO Connect
  

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

Permit times are usually 6 to 8 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 Richmond'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 Richmond.