One of the first challenges in constructing a dadu is finalizing the design. However, you’ll be happy to know that the city of Seattle has a pre-approved design program that offers homeowners a variety of designs that they can purchase. One of the most sought-after designs is the Schooner by 5 Dot Architects. The best part is that the plans are less expensive than hiring an architect for a custom design, and the permitting process for pre-approved plans is much simpler compared to other design options.