Accessory Dwelling Units

>>Apply for an Accessory Dwelling Unit Permit

If your property is in the Sea Haven or Dunes developments, special water restrictions may apply. Please call the Planning Dept. for additional information at (831) 884-1220.


Marina Municipal Code Section 17.42.040 was adopted on October 20, 2020 and codified on November 21, 2020. Since then, the ordinance has undergone several updates to accommodate changes to state law concerning ADUs. This ADU webpage summarizes the ordinance, provides up-to-date permitting information, and explains how the City allows various types of ADUs on different properties. Additional information about ADUs and JADUs is available on the California Department of Housing and Community Development website.

Types of Accessory Dwelling Units (ADU)

  • Detached: The unit is separated from the primary structure. 
  • Attached: The unit is attached to the primary structure. 
  • Converted Existing Space: Space (e.g., master bedroom, attached garage, storage area, or similar use, or an accessory structure) on the lot of the primary residence that is converted into an independent living unit. 

Junior Accessory Dwelling Unit (JADU) 

JADU Definition: A dwelling unit no larger than 500 square feet, includes an efficiency kitchen, and is entirely contained within the walls of an existing or proposed single-family residence (including attached garages). The JADU either includes its own sanitation facilities, or shares sanitation facilities with the existing residence.

Benefits of ADUs 

  • Affordability: ADUs are an affordable type of home to construct in California because they do not require paying for land, major new infrastructure, structured parking, or elevators.
  • Efficiency: ADUs can provide as much living space as many newly-built apartments and condominiums, and they are suited well for couples, small families, young people, and seniors.
  • Income: ADUs can provide a source of income for homeowners. ADUs can also increase property value. 
  • Flexibility: ADUs give homeowners the flexibility to share independent living areas with family members and others, allowing seniors to age in place as they require more care.
  • Privacy: ADUs allow extended families to be near one another while maintaining privacy.
  • Housing options: ADUs provide a method to build more housing quickly, within existing neighborhoods while preserving neighborhood character, and without increasing density. Building a new ADU usually takes a few months, as opposed to a new housing subdivision that could take two years or more.

Where are ADUs and JADUs allowed?

  • ADUs can be developed on properties with an existing or proposed single family residence, or on a property with an existing multifamily/mixed-use development. These properties must be zoned to allow residential uses.
  • Can be attached, detached, or built within the existing structure.
  • See below for more detailed information on Regulations and Standards, Permit Processing, and Frequently Asked Questions. 
  1. Handouts, Forms and Guidelines
  1. ADU Permitting Process
  1. FAQ