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The official website of the City of Phoenix

    Accessory Dwelling Units (ADU)

    What is an Accessory Dwelling Unit (ADU)?

    ADUs, often referred to as guest houses, casistas, or granny flats are seperate, self-continued living areas that are either fully detached structures or attached to an existing home, with its own external kitchen. 

    An ADU usually contains all of the amenities to operate as a fully independent, operational dwelling, including a kitchen, bathroom, living area and sleeping quarters. 

    New Rules

    In late 2024, the Phoenix City Council approved new ordinance changes to comply with new state laws for ADUs.

    Learn More:

    Read the ADU Ordinance

    Beginner's Guide to ADUs

    sample floorplan - 3
    Example of an ADU floor plan
    ADU-StockImage-1

    Curious if your property is suitable for an ADU?

    Check out the Frequently Asked Questions at the bottom of this page for basic, preliminary information.

    Please consult with the Planning and Development Department before making any decisions to alter your property. ​​​​​

    Contact Us

    Have questions about ADUs? Send us an email!

    PDD Ombudsman @ ​pdd.ombudsman@phoenix.gov

    Frequently Asked Questions