Simplifying the Path to Building Your Dream ADU
For homeowners in Seattle looking to add a Detached Accessory Dwelling Unit (DADU) to their property, navigating the permitting and design process can often be a complex and time-consuming challenge. Fortunately, the City of Seattle has introduced a game-changing solution: pre-approved DADU plans. This initiative is designed to streamline approval procedures, significantly reduce costs, and make the process of building a DADU more accessible and hassle-free.

What Are Pre-Approved DADU Plans?
Pre-approved DADU plans are architectural and engineering designs that have already undergone review and received city approval. These plans meet all local building codes, zoning requirements, and safety standards, allowing homeowners to skip the lengthy design approval process. The pre-approval means that once you select a plan, only minimal review is needed — often just a simple permit application.
How the Pre-Approval Process Benefits Homeowners
- Faster Permit Approval:
By choosing a pre-approved plan, homeowners can significantly cut down on the time spent waiting for permits. Instead of navigating the often lengthy review process, approval can be obtained quickly, accelerating your construction timeline. - Cost Savings:
Eliminating the need for custom architectural design and reducing permitting delays translates directly into savings. Homeowners spend less on design fees and lose less valuable time waiting to begin construction. - Reduced Headaches and Uncertainty:
The pre-approval process offers peace of mind by providing a clear, predictable pathway to approval. It minimizes surprises and unforeseen delays, making the entire project less stressful. - Simplified Construction Planning:
With approved plans in hand, contractors can begin work sooner, and you’ll have a clear blueprint to guide construction, ensuring your project stays on track and within budget.



The Impact of Pre-Approved DADU Plans
Seattle’s initiative aims to promote more backyard ADUs as a way to address the city’s housing shortages while easing the burden on homeowners. Pre-approved plans lower the barriers significantly, encouraging more residents to explore building their own ADUs — whether for additional income, multigenerational living, or guest accommodations.
How to Get Started
If you’re interested in building a DADU using the city’s pre-approved plans, your first step is to review the available designs and select one that suits your lot and needs. Once you choose a plan, submit your permit application with the necessary documentation. The city’s streamlined review process means you can expect quicker approvals and a smoother path to your new ADU.
At Tenhulzen Construction, we specialize in residential development and are well-versed in Seattle’s permitting process. We can help you select the right pre-approved plan, guide you through the application process, and manage your project from start to finish ensuring compliance and efficiency.
Seattle’s pre-approved DADU plans are revolutionizing the way homeowners approach backyard ADU projects. By reducing permit and design time, these plans save money, minimize headaches, and accelerate your construction timeline. If you’re considering adding a DADU to your property, now is an excellent time to take advantage of this streamlined process.
Contact us today to learn more about how we can help you navigate the pre-approved plan options and bring your backyard ADU project to life.