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Seattle ADU Builders

Are You Looking to Add an Accessory Dwelling Unit (ADU) to Your Seattle Property? Let Haas Build the ADU of Your Dreams.

Let's Get Started.

Our Approach to ADU Builds

Haas Development & Construction is proud to offer the Greater Seattle community professional development and construction expertise to build an ADU configured for your unique property — either attached (AADU) or detached (DADU) from your home. Our team is dedicated to constructing your ADU unit with your primary goal in mind and can customize the build to meet your individual needs.

For any of our ADU projects, our first step will be confirming the ADU plan, property configuration, and permitting. Once those details are set, our expert team of contractors and engineers will handle everything from excavation or demolition; through concrete and framing; electrical, plumbing, and mechanical engineering and implementation; all the way to final finishes.

When you work with Haas, you choose building experience. Whether you are looking for a completed move-in ready ADU or would like to partner alongside us to customize your ADU build in Seattle, we will work with you to find the best construction approach.

Meet Our ADU Builders

We are talented and professional Seattle ADU builders with design and engineering expertise to bring your ADU dream to life. Meet our team here.

Haas Development & Construction has partnered with Urban Cottage Seattle as their exclusive development and construction company for all certified DADU builds. DADUs, or detached accessory dwelling units, are an excellent way to increase the value of your property, giving you additional private living space for extended family, short-term or long-term rentals, or even to sell as a condominium. If you purchase a pre-approved plan from Urban Cottage, you can obtain the proper permits for your project several weeks before any other custom plans.

ADU under construction with plywood walls

Where to Start

Interested in learning more about ADU regulations in Seattle and the many uses of an ADU? Have questions on the construction process? Ready to begin?

We are ready to help you get started wherever you are in the process. Contact Haas Development & Construction today to start a project with us. Fill out the form below or give us a call at (206) 494-3369.

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