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

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

• Detached ADU: Separate building from the main residence
• Attached ADU: A newly constructed detached unit or an addition to an existing detached accessory structure
• Conversion ADU: Converts an interior area within an existing or proposed primary dwelling or existing accessory structure into an ADU
• Junior ADU (JADU): Up to 500 sq ft, located within an existing or proposed primary residence, includes an efficiency kitchen, may have its own bathroom or share with the main home, no additional off-street parking required

• Maximum Size:
  
  • Detached: Up to 800 sq ft (new construction), can go up to 1,200 sq ft depending on lot size
  • Attached: Up to 50% of primary dwelling, max 1,200 sq ft
• Setbacks:
  
  • Minimum 4 ft from rear and side property lines
• Height Limits:
  
  • Typically 16 ft, unless otherwise specified
• Parking Requirements:
  
  • Additional parking is not required if the ADU is:
    
    • Conversion ADU or Junior ADU (entirely within the existing primary residence or accessory structure)
    • Located within ½ mile of public transit
    • Situated within a historic district
    • Within one block of a car-share service

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

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

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

Permit times are usually 30 days 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 Newark's ADU process can help make approval easier.

Accessory Dwelling Units are permitted in any zoning district where residential uses are allowed. This includes both single-family and multi-family residential zones.

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