Adding an Accessory Dwelling Unit to your property is one of the smartest investments a Seattle homeowner can make right now. The city has actively updated its ADU laws to encourage development, and the demand for rental units in the Greater Seattle area remains strong. But navigating the process, from zoning analysis and design to permitting and construction, requires the right partner. Hiring the right ADU builder in Seattle, WA, is the single most important decision you will make for this project. The first thing to look for in an ADU builder is direct, verifiable experience with ADU projects specifically. A contractor who primarily does kitchen and bathroom remodels may not be familiar with the unique structural, permitting, and utility challenges that come with building a self-contained living unit. Ask to see a portfolio of completed ADUs and speak with past clients if possible. At AmyWorks, we have been building ADUs and DADUs in the Greater Seattle area since 2020, and we can walk you through completed projects that reflect a range of budgets, lot types, and design styles. The permitting process for an ADU in Seattle involves multiple city departments and can take several months if not managed carefully. The project typically requires a site plan, architectural drawings, structural engineering, and separate permits for building, plumbing, electrical, and mechanical work. An experienced ADU builder will manage this process on your behalf, coordinating with the Seattle Department of Construction and Inspections (SDCI) and keeping the project moving. Delays in permitting are one of the most common causes of cost overruns, so working with a builder who knows the process is essential. Beyond permits, the design of your ADU matters enormously for its long-term value and usability. A well-designed ADU functions as a complete home, with a practical kitchen, a full bathroom, adequate storage, and comfortable sleeping space. It should also be designed to match the exterior style of your main house so it looks like it belongs on the property rather than an afterthought. At AmyWorks, we guide you through every design decision, from the floor plan to the finishes, ensuring the final product meets your goals whether that is rental income, housing for a family member, or a flexible guest space.Finally, ask any prospective builder about their approach to utility connections. Extending plumbing, electrical, and heating systems to a new ADU is a significant part of the project cost and complexity. Some lots require new service lines from the street, while others can tap into existing systems. An experienced builder will assess your property’s utility infrastructure early in the planning process and give you an accurate picture of what is involved. Contact AmyWorks to start with a site assessment and learn what your property can support.