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Sea-Tac’s Concourse D Annex Honored with Design-Build Awards

The Design-Build Institute of America (DBIA) has recognized the Seattle-Tacoma International Airport project with a National Award of Merit and a National Award of Excellence in the Aviation category.

The two-story, 32,400-sq.ft. Annex to Sea-Tac Airport’s Concourse D, which opened in 2018 after just 18 months of design and construction, features six new passenger gates. The integrated design-build team included the Port of Seattle, HOK and The Walsh Group.

DBIA commended the team’s regular and transparent communication as key to one of the Port of Seattle’s first traditional design-build projects. Due to collocation adjacent to the Port’s on-site office, all team members could communicate daily and address challenges as they came up, leading to a shortened review period.

Video credit: Daniel Gray, Gray Media Productions

“One of the biggest challenges for this project was the short time frame. We had to be through design and into construction in under six months,” said HOK project manager Todd Buchanan. “Our design build team—working closely with the client—came up with a new process to integrate them closer to our team.”

That process enabled the team to overcome multiple hurdles, including soil instability discovered during footing excavation that led to a redesigned structural foundation and the challenge of transitioning the project from an unsecured site to a secured site midway through construction.

In the end, the project stayed true to its original design intent and was completed ahead of schedule and within the tight budget. With several sustainable features, the Annex is expected to become the first airport terminal building in the United States to achieve Silver certification through the USGBC’s LEED v4 for Building Design and Construction rating system.

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