ADUs (Accessory Dwelling Units) are becoming more popular than ever for multiple reasons. Over the last few years, some municipalities have made it easier for homeowners to install ADUs. For example, Seattle’s Mayor, Jenny Durkan, signed legislation in 2019 to remove regulatory barriers and make it easier for property owners to create ADUs in Seattle’s single-family zones. Seattle has ten pre-approved plans that they claim the permitting department only needs 30 days to approve to issue a permit.