Duarte

The City of Duarte offers a Pre-Approved ADU Program to simplify and accelerate the ADU development process. Pre-approved plans are reviewed by the Building and Safety Division, allowing homeowners to reduce design and permitting time. However, these plans cannot be modified if applicants want to maintain expedited review benefits. 

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The Planning Division is the first step to determine eligibility and guide applicants through the process.

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

• Detached ADU: Separate structure using pre-approved or custom plans
• Attached ADU: Attached to the primary residence (if applicable through standard permitting)
• Conversion ADU: Conversion of existing space such as garage, attic, or basement
• Junior ADU (JADU): Small unit within an existing home

• Maximum Size:
  
  • Detached: Up to 1,200 sq ft
  • Attached: Up to 50% of primary dwelling size, with general caps around 800-1,000 sq ft depending on bedrooms
    
    
• Setbacks:
  
  • Minimum 4 feet from side and rear property lines
    
    
• Height Limits:
  
  • Detached: Typically, 16-18 feet
  • Attached: Up to 25 feet or same as primary dwelling
    
    
• Parking Requirements:
  
  • Generally, 0-1 parking space required, with exemptions (e.g., near transit or conversions)

• Contact the Planning Division to confirm eligibility and project feasibility
• Select and purchase a pre-approved ADU plan from a designer
• Prepare site-specific layout and required application materials
• Submit completed application and supporting documents to the Planning Division via email.

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

Use of pre-approved ADU plans can significantly reduce permitting and design timelines, as plans are already reviewed by the city. 

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

Most residential zones are eligible for ADUs, including R-1 zones. There are no minimum lot sizes for ADUs in most areas of Duarte. Some hillside or environmentally sensitive zones may have special restrictions.

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

ADU regulations are constantly evolving and may vary by city, county, or even neighborhood. Before starting your project, it’s always best to consult with a trained professional or certified ADU Specialist to ensure your plans align with current local requirements.