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In Washington State, an Accessory Dwelling Unit (ADU) is a secondary living space designed to provide additional housing on a single lot. These structures can be detached, attached, or converted from existing spaces like garages or basements. Key requirements include compliance with local zoning laws, adherence to building codes, and ensuring the ADU meets minimum square footage and safety standards. Whether you're exploring what qualifies as an adu in washington state for rental income or family housing, understanding these guidelines is essential for a smooth project. Proper planning ensures your ADU enhances your property’s value while meeting legal and practical needs.