ADU rules in Gresham, OR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Gresham allows accessory dwelling units (ADUs) in residential zones per Oregon state law (HB 2001). One ADU is permitted per lot. ADUs must meet development code standards for size, setbacks, and parking.
Gresham permits accessory dwelling units in residential zones, aligned with Oregon House Bill 2001 which requires cities to allow ADUs. One ADU is allowed per single-family lot. ADUs may be attached to the primary dwelling or detached structures. Maximum size is typically limited to 800 square feet or a percentage of the primary dwelling. Setback, height, and design standards in the Development Code apply. Owner occupancy requirements have been relaxed under state law. ADUs require building permits and must meet all building code standards.
Unpermitted ADUs face enforcement action. Non-compliant structures must be brought up to code.
Gresham, OR
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Gresham, OR
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Gresham, OR
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Gresham, OR
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Gresham, OR
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Side-by-side rule comparisons with other cities in Multnomah County.
See how other cities in Multnomah County handle adu rules.
See how Gresham's adu rules rules stack up against other locations.
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