Claremont

One ADU is permitted on each single-family residential lot. The ADU must be located on the same lot as an existing or proposed primary residence and cannot be sold separately from the primary dwelling.

One JADU is permitted on each single-family residential lot. A JADU must be created within the existing or proposed primary residence and may share sanitation facilities with the main dwelling.

Claremont regulates ADUs through local development standards that address size, setbacks, height and architectural compatibility.

• 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 and shares at least one wall.
• Conversion ADU: A unit created by converting existing space such as a garage, attic, or basement into an independent living unit.
• Junior ADU (JADU): A unit up to 500 sq. ft. located within the existing home, including a kitchen and sleeping area and may share a bathroom.

• Maximum Size:
  
  • Minimum 150 sq. ft. and maximum 1,000 sq. ft.
    
    
• Setbacks:
  
  • Minimum 4 ft from property lines
    
    
• Height Limits:
  
  • Maximum 16 ft in most cases
    
    
• Parking Requirements:
  
  • Additional parking is not required if the ADU is:
    
    • No parking is required if the ADU is within ½ mile of public transit, located in a historic or architecturally significant district, or involves conversion of an existing garage or structure 
    • Where existing covered parking (garage, carport, etc.) is demolished or converted in conjunction with ADU construction, replacement parking is not required

To build an ADU in Claremont, the following approvals and submittals are typically required:

• Completed application with property owner authorization
• Site plan showing existing and proposed structures
• Floor plans and elevation drawings
• Material specifications for exterior elements
• Photos of the primary residence
• Preliminary title report requirements
• Neighborhood-specific overlay zones
• Statement of intended occupancy
• Landscape plan (if applicable) 

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

ADU permit timelines in Claremont are governed by California state law, which requires cities to approve or deny a complete ADU application within 60 days. 

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

ADUs are allowed on single-family residential lots with an existing or proposed primary dwelling.

For the most current and complete information, refer directly to the City of Claremont.The official ADU webpage provides an overview of development standards, permitting steps and eligibility requirements. The ADU Roadmap outlines detailed development standards, application requirements and design criteria. The city also provides pre-approved ADU designs and a hold harmless agreement for homeowners choosing to use those plans.