Accessory Dwelling Units
What is an Accessory Dwelling Units (ADU)?
As defined by the Mercer Island Municipal code, an ADU (accessory dwelling unit) is: "A habitable dwelling unit added to, created within, or detached from a single-family dwelling that provides basic requirements for living, sleeping, eating, cooking and sanitation" (MICC 19.16.010). ADUs can benefit homeowners by providing the opportunity to obtain rental income and security via the means of tenants. These ADUs must adhere to specific guidelines that protect the character of the neighborhood, contained in MICC 19.02.030.
To learn more about ADUs and the criteria which pertains to them, click here. If you would like to see our FAQ page on ADUs, click here. Another organization that provides information regarding ADUs is ARCH.
What is "ARCH (A Regional Coalition for Housing)"?
ARCH ("A Regional Coalition for Housing") began in 1994 as an inter local agreement between the cities of Mercer Island, Bellevue, Kirkland, Redmond, Woodinville, Issaquah, Bothell, Newcastle, and King County to create and preserve affordable housing. Medina, Clyde Hill, Yarrow Point, Hunts Point, and Beaux Arts Village formally joined ARCH in 2000. ARCH staff serves as each City's "housing department" and coordinates with other City staff in various housing related projects, plans and services. ARCH is also helpful in obtaining information regarding ADUs. To get more information, visit the ARCH website.
This information is summarized from Title 19 of the Mercer Island City Code, "Unified Land Development Code" and is provided for quick reference only. To determine exact requirements, and for other development regulations affecting a parcel or lot, Title 19 should be consulted.