Pasadena

Pasadena follows California ADU laws while adding local zoning, design standards and fee structures. ADUs are allowed on properties with an existing or proposed primary dwelling across most residential zones and compliant applications are approved ministerially without public hearings.

Additional rules apply in historic districts, particularly regarding design and street visibility. The city also offers pre-application consultations to help identify issues early and streamline the approval process.

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

• Detached ADU: Separate structure on the same lot
• Attached ADU: Physically connected to the main home
• Conversion ADU: Created within existing space (garage, interior area, etc.)
• Junior ADU (JADU): Small unit within a primary residence

• Maximum Size:
  
  • Detached: Up to 800 sq ft must be allowed
  • Attached: Up to 50% of the primary dwelling’s living area, or up to 1,000 sq. ft, whichever is applicable under state law
    
    
• Setbacks:
  
  • Minimum 4 ft side and rear setbacks for new ADUs
  • Additional spacing rules may apply:

• 5 ft setback required for walls with openings (windows/doors)
• 6 ft separation from other structures for larger ADUs
  
  

• Height Limits:
  
  • Detached ADUs typically allowed at 16 ft minimum baseline
  • May increase depending on lot and zoning conditions
    
    
• Parking Requirements:
  
  • Standard requirement: 1 parking space per unit or bedroom
  • Parking not required if:
    
    • Within ½ mile of public transit 
    • Located in a historic district
    • Converted from existing space

To build an ADU in Pasadena, you typically need:

• Building permit application
• Zoning & planning approval
• Architectural plans
• Utility connections & applicable fees
• Fire and building code compliance
• Additional reports/permits if required (grading, demolition, soils) 

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

Under California state law, ADU applications must be approved or denied within 60 days once deemed complete. In practice, the timeline often includes about 1-2 months for plan review, with a total duration of roughly 2-4 months from submission to final approval, depending on the extent of revisions required during the process. 

Engaging professionals familiar with Pasadena ADU process can help streamline approval and potentially reduce delays.

ADUs are allowed in most residential zones and under California state law there is no minimum lot size requirement for development. However, additional constraints may apply depending on the property, particularly in historic districts where design and visibility restrictions are enforced and in hillside areas where site limitations and size constraints can affect what can be built.

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

It’s best to consult the official city website, particularly the City of Pasadena Planning & Community Development Department. Key resources include the ADU Handbook and Process Diagram, the city’s ADU program and planning pages and the ADU Standard Plans Program, all of which provide detailed guidance on requirements, design standards and application procedures.