La Canada-Flintridge

La Cañada Flintridge permits both Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) on residential properties in accordance with California state law and local regulations established under Ordinance No. 519 (2024). On single-family lots, property owners are allowed to build one ADU-whether attached, detached, or created through conversion-as well as one JADU. 

On multi-family lots, multiple ADUs may be permitted, including those developed by converting existing non-habitable spaces or through a limited number of detached units; however, JADUs are not allowed on multi-family properties. In all cases, ADUs must be situated on the same lot as the primary residence and must function as independent living units.

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

• Detached ADU: A standalone residential unit located on the same lot as the primary home
• Attached ADU: A unit that is physically connected to the main house
• Conversion ADU: A unit created from existing space such as a garage or accessory structure
• Junior ADU (JADU): A unit up to 500 sq. ft. located within the primary residence, including an efficiency kitchen and optional shared sanitation

• Maximum Size:
  
  • Detached: 
    
    • Up to 1,200 sq. ft. maximum
    • At least 800 sq. ft. allowed regardless of other limits
  • Attached: 
    
    • Maximum 50% of primary dwelling size
    • Up to 1,200 sq. ft.
      
      
• Setbacks:
  
  • Minimum 4 ft from side and rear property lines
  • Front setbacks must comply with underlying zoning
  • No setbacks required for conversions unless needed for safety
    
    
• Height Limits:
  
  • Detached: 
    
    • 16 ft (standard)
    • Up to 18 ft in some cases (e.g., multi-family or near transit) 
  • Attached: Up to 25 ft or per zoning district
    
    
• Parking Requirements:
  
  • One (1) parking space per ADU required unless exemptions apply
  • Parking is not required if:
    
    • Located near public transit 
    • Part of an existing structure conversion
    • Located in a historic district
    • Near a car-share location
  • JADUs do not require parking

To build an ADU in La Cañada Flintridge, the following approvals and submittals are typically required:

• Building permit application submission through the city’s Connect LCF system
• Preparation of architectural and site plans
• Plan check review for zoning and building compliance
• Utility and infrastructure coordination
• Compliance with building and safety codes

Homeowners should also review La Canada-Flintridge current fee schedule, utility connection requirements and fire code compliance.

ADU permit timelines in La Cañada Flintridge generally follow California state law, which requires approval of complete applications within approximately 60 days. However, actual processing times can vary depending on factors such as the completeness of the application, the need for plan check corrections and the overall complexity of the project. As a result, most homeowners should expect the process to take a few months from initial submission to final permit issuance.

Accessory Dwelling Units (ADUs) are permitted across several zoning districts in La Cañada Flintridge, including R-1 (Single-Family Residential), R-3 (Multi-Family Residential), Residential Planned Development (RPD), as well as mixed-use and certain public or semi-public zones. There is generally no minimum lot size required to develop an ADU; however, all projects must still comply with applicable zoning regulations and development standards.

For the most current and complete information, refer directly to the City of La Canada-Flintridge.

ADU regulations are subject to change and may vary based on property conditions. Before starting your project, consult with a qualified professional or ADU specialist to ensure compliance with current local requirements.