Miller Hull

Concourse C Expansion at SEA

SeaTac, WA
Creating an amazing destination to attract and retain traveling passengers
Client Port of Seattle
Certifications Pursuing LEED Gold
Size 108,000 SF
Completion 2029


The Port of Seattle has seen rapid passenger growth at the SEA over the last decade. The goal of the 110,000-square-foot, $340 million redesigned Concourse C is to accommodate this growth and create a dynamic, performative and sustainable expansion to the C1 building. Supported by a diverse team of local experts, Miller Hull and Woods Bagot are the joint project design leaders and will significantly elevate SEA’s customer experience.

Diversity, performance, sense of place and sustainability are the driving design principles.

The Port and the design team are committed to advancing equity and addressing contracting disparities by increasing the participation of Women and Minority Business Enterprises (WMBE) and other disadvantaged firms. The design team is drawing upon a diverse pool of local talent to the aspirational goal of 15% WMBE for the design procurements.

The birthplace of Jimi Hendrix and home of Kurt Cobain, Seattle is known for its groove. The musical experience will begin right here, where live music will be performed on a new stage at the heart of the concourse. The performative nature of the concourse will be amplified by outstanding environmental and commercial goals.

Sense of Place: Experiencing the Northwest Pacific
Passengers arriving at C1 will have no doubt as to where they are. Through an interplay of local materials, references to nature, and events, the expansion will express the natural beauty of the Pacific Northwest, its lively culture, its eating and drinking scene, and its vibrant economy. The retail market will draw inspiration from Seattle’s beloved Pike Place Market, with live performances celebrating the City’s musical culture.

Sustainability is at the heart of the airport’s – and Seattle’s – agenda for the future. The C1 Building Expansion is the first project to implement the Port’s new Sustainable Project Framework. Targeting LEED Silver certification, the framework supports early integration of sustainability in capital projects with a view to meeting the Century Agenda goals. Miller Hull, the architect of the Living Building Certified Bullitt Center, and Woods Bagot, a team member for SFO’s Harvey Milk Terminal 1, which will achieve LEED Gold, have proven experience in reducing operational and embodied carbon and water, and introducing biophilia to create buildings that improve the health of people and of the planet.

Located between Concourses C and D, the project will:

  • Add four additional floors at approximately 27,000 square feet each
  • Bring natural daylight and multi-level dining and retail to Concourse C
  • Build new restrooms, vertical circulation, and seating

Project Team

Architecture joint project design leaders: The Miller Hull Partnership, LLP and Woods Bagot
General Contractor/Construction Management: Turner Construction
Structural and Civil Engineer: Magnusson Klemecic Associates
Mechanical, Plumbing and Sustainability Engineers: PAE
Electrical Engineer, Smoke Control, Airfield and Logistics: ARUP
Airport Dining and Retail Consultant: AirProjects
IT and Security: Moye Consulting
Wayfinding and Signage: Mayer/Reed
Code Compliance and Fire Protection: Jensen Hughes
Lighting Design: Dark|Light
Noise and Vibration and Vertical Transportation: The Greenbusch Group
Geotechnical Engineer: Hart Crowser, Inc.
Cost Advice: Cumming
Accessibility/ADA: Code Unlimited, Inc.
Site Investigations: Holt Services