The Rise of Accessory Dwelling Units (ADUs) in the Greater Seattle Area: What Homeowners Need to Know

As housing affordability challenges persist in the Seattle-Tacoma region, Accessory Dwelling Units (ADUs) have emerged as a practical solution for homeowners seeking to maximize their property's potential. These self-contained living spaces, either attached (ADUs) or detached (DADUs), offer flexibility, additional income, and contribute to the region's housing diversity. Understanding ADUs: Definitions and Types An ADU is a secondary housing unit on a single-family residential lot. They come in two primary forms: Attached Accessory Dwelling Units (AADUs): These are integrated within the primary residence, such as basement or attic conversions. Detached Accessory Dwelling Units (DADUs): Also known as backyard cottages, these are standalone structures separate from the main house. Both types must include essential living facilities like a kitchen, bathroom, and sleeping area. Recent Legislative Changes Favoring ADU Development King and Pierce County and Washin...