Portland Airport Completes $2 Billion Terminal Expansion

The Port of Portland and ZGF Architects LLP officially opened the second and final phase of the $2 billion main terminal expansion at Portland International Airports (PDX) on June 30, 2026. The completion of the one million-square-foot project doubles the passenger capacity of the airport and concludes five years of phased construction.

According to a press release issued by ZGF Architects, the expansion represents the largest public infrastructure project in Oregon’s history. The facility remained fully operational throughout the construction process, which was executed by a project team including the Hoffman Skanska Joint Venture, KPFF, Arup, PAE, and Swinerton.

Architectural and structural engineering features

A defining feature of the renovated terminal is a nine-acre prefabricated mass timber roof spanning the facility. The structure is engineered for high seismic resilience, specifically designed to withstand a 9.0 magnitude earthquake originating from the Cascadia Subduction Zone.

The terminal also establishes new environmental benchmarks for aviation infrastructure. The design incorporates an all-electric ground-source heat pump system, which the architects state will achieve a 50 percent reduction in energy use per square foot compared to previous operations.

Phase two enhancements and passenger experience

Following the opening of the project’s first phase in 2024, the newly completed second phase introduces a redesigned arrival sequence. The layout features new exit lanes on the north and south ends of the terminal to streamline connections between concourses. Additional upgrades include a new descent path to the baggage claim area, expanded post-security gathering spaces, skylit all-user restrooms, and an updated selection of local retail and dining options.

Port of Portland Executive Director Curtis Robinhold highlighted the regional focus of the construction effort and the materials utilized throughout the terminal.

“Thousands of local workers brought our shared vision to life, using locally sourced materials and setting a new bar for how it should be done,” Robinhold said. “I couldn’t be prouder of this special place we built together.”

Sharron van der Meulen, managing partner at ZGF Architects, noted that the terminal is designed to adapt to future aviation demands while serving as a gateway to the Pacific Northwest.

Industry recognition and operational impact

Since the initial phase debuted in 2024, the PDX terminal design has garnered multiple international accolades. These include the Prix Versailles World’s Most Beautiful Airport award, Fast Company’s Best Design in North-America distinction, and recognition from the Holcim Foundation for Sustainable Construction.

AirPro News analysis

We view the completion of the PDX terminal as a significant case study for mid-sized and large hub airports facing capacity constraints. Executing a $2 billion, one million-square-foot expansion while maintaining uninterrupted flight operations demonstrates a highly coordinated phasing strategy. The integration of a mass timber roof and an all-electric heat pump system aligns with the broader aviation industry’s push toward decarbonizing ground infrastructure, providing a viable template for future terminal modernization projects across North America.

Sources: ZGF Architects LLP via PR Newswire