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Seattle-Tacoma International Airport Concourse D Annex

Seattle, Washington

The elegant form of this two-story Annex to Concourse D evokes the joy of flight and natural splendor of the Pacific Northwest.

Built to relieve passenger congestion during peak periods at Sea-Tac Airport, the Annex acts as a conduit between the main passenger terminal and a hardstand on the tarmac. From here, passengers board buses that shuttle them to their planes. It includes six passenger gates, multiple concession stands and a children’s play area.

HOK’s design creates a beautiful, daylit open pavilion with an expressed structure. A unique glue-laminated (glulam) timber truss system constructed from locally sourced Douglas fir trees enhances the Pacific Northwest aesthetic and reduces the building’s embodied carbon.

Use of natural materials from the local landscape creates a calming, pleasant environment. The all-glass curtain wall brings in natural light and connects passengers to the outdoors. A light interior color palette contributes to the open, comfortable feeling.

The Port of Seattle wanted to provide passengers and employees with a healthy, sustainable environment. The Annex is expected to become the first airport terminal building in the United States to achieve LEED v4 Silver certification.

An integrated design-build team including the Port of Seattle, HOK and The Walsh Group developed the Annex within a tight budget and in just 18 months.

LEED-NC Silver anticipated
32,400 sq. ft. / 3,010 sq. m.
DBIA – Aviation National Award of Merit
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