Haas Development & Construction is proud to offer the Greater Seattle area services to build ADUs, configured for your unique property — either attached (AADU) or detached (DADU) from your home.
Seattle and surrounding areas
On time and on budget
Our prefab ADU was installed quickly and looks custom-built. Very happy with the quality and the timeline.
In-Law SuiteBeautiful ADU
We compared several ADU builders and chose them based on their portfolio and reviews. Best decision we made!
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