An inaugural ceremony marked the official opening of Techo International Airport in Phnom Penh. Designed by Foster + Partners, the new terminal building embodies Cambodia's long-term vision for growth. It evokes a strong sense of place, drawing inspiration from one of the oldest civilizations on earth, inspired by its vernacular forms, and responsive to the tropical climate.

Located 20 kilometers south of the city centre, the terminal building comprises a central head house and two aerofoil-shaped piers. The project's first phase – the head house and northern pier – opened to the public in September this year. The southern pier is planned to open by 2030. The terminal layout prioritizes short walking distances, clear sightlines, and simple orientation, allowing passengers to easily navigate the building. Passenger processing, security and immigration, and retail are sheltered by a single overarching roof canopy that stretches from the drop-off to airside. The modular roof is supported by structural 'trees' that each span 36 meters. The roof has an undulating form that crescendos at the centre of the building, echoing Cambodia's spectacular palaces and temples.

Throughout the terminal building, soffits are inspired by traditional basket weaving. Suspended under the building's lightweight steel grid shell structure, a latticed soffit filters daylight into the vast terminal space throughout the day. 180 skylights are strategically placed around structural 'trees', to bring natural light deep into the space while ensuring it is distributed evenly. A warm artificial lighting system is also integrated within the soffit's layers and the structural 'trees', creating a calm and comfortable atmosphere in the evening. The floor slab soffits feature unique woven infills, which complement the overarching latticed soffit.

"Techo International Airport is a celebration of Cambodian culture and light, forming a new gateway to the country. It is also one of the most sustainable airports in the region, filled with natural daylight and incredible local greenery, and offering strong visual connections to the outside. The terminal holistically transforms the experience of travel for the people of Cambodia and the millions of visitors who will travel through here every year." Stefan Behling | Head of Studio, Foster + Partners

Greenery follows the passenger journey through the terminal, with native Romduol trees rising within the soaring central void, alongside local palms and flowers, which contribute to a strong sense of place. Materials are warm and welcoming, evoking the local vernacular in a contemporary manner. A collection of 200 handcrafted sculptures, as well as a centerpiece bronze-cast Buddha, has been carefully curated to celebrate the country's history and evolving identity.

The project aspires to be one of the greenest airports in the world by seamlessly integrating architectural design and engineering to reduce the project's carbon footprint significantly. The terminal's overhanging roof is designed to provide shading for both the drop-off areas and interior spaces, reducing the need for mechanical ventilation. Its innovative soffit and roof lights address the challenge of illuminating larger terminal spaces and reduce the need for artificial lighting during the day.

The practice has also designed the wider airport city masterplan, which has the new terminal at its heart. A high-speed rail link creating an inter-model hub is planned for future phases of the development, encouraging public transport use and reducing car traffic to the airport. A green public park is the centerpiece of the master plan, providing a healthy and serene environment for people using the airport, as well as those living and working in the airport city.

"The modular lightweight shell structure and layered soffit filters daylight into the building – allowing people to experience the evolving qualities of the external environment throughout the day. Our design blends technological innovation with references to Cambodia's built heritage. Interior materials are warm and welcoming to ensure the highest level of passenger comfort, while reinforcing the country's unique identity." Nikolai Malsch | Senior Partner, Foster + Partners "Our holistic vision encompasses the airport's relationship with its immediate surroundings and the city. The terminal building overlooks a new public park, enhancing connections with nature and supporting general wellbeing for all passengers." Matthew Hayhurst | Partner, Foster + Partners