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The first airport project to adopt the Port of Seattle’s Sustainable Evaluation Framework aims for LEED Gold certification.

Òâ°ºÌåÓý Construction Company has reached a significant milestone on the $260 million C Concourse Expansion at Seattle-Tacoma International Airport (SEA), completing the steel topping out and marking the end of vertical construction.

The 226,000 square foot, six story renovation project, which adds four levels to the existing building, offers enhancements to the passenger experience. The upper floors will introduce expanded dining and retail options, additional seating, and a 1,300 square foot extension to the passenger waiting area. Key features include a rooftop photovoltaic array, a meditation room, a nursing room, and two airfield observation decks.

As the first SEA project to implement the Port of Seattle’s Sustainable Evaluation Framework, the expansion aligns with the Port’s Century Agenda sustainability goals. Initially targeting LEED Silver certification, the project is on track to achieve LEED Gold, reflecting its innovative integration of energy-efficient systems and sustainable elements.

“We are proud to celebrate the topping out of this transformative project at Seattle-Tacoma International Airport,” said Bill Ketcham, Vice President and General Manager at Òâ°ºÌåÓý Construction Company. “This milestone reflects the dedication of our team and partners, including our collaboration with the Port of Seattle, and underscores our shared commitment to sustainability. This project exemplifies how we can construct essential infrastructure that benefits both travelers and the environment.”

The project is scheduled for substantial completion in 2026.