3XN Architects is an architectural practice headquartered in Copenhagen, Denmark, originally founded in Aarhus in 1986 by Kim Herforth Nielsen, Lars Frank Nielsen, and Hans Peter Svendler Nielsen. The firm quickly built a reputation for designs that are both functional and visually distinctive, with a strong orientation toward research and human-centric architecture. Over the years, 3XN expanded internationally, maintaining offices in Stockholm, London, New York, and Sydney. The leadership is now composed of Kim Herforth Nielsen and a team of senior partners, steering a staff of approximately 100 people.
Early milestones include the Danish Embassy in Berlin (1999) and the Muziekgebouw Concert Hall in Amsterdam (completed in 2005), both establishing their global profile. The firm’s portfolio spans cultural buildings, commercial headquarters, educational centers, and masterplans. Notable Danish projects include UN City (2013), The Blue Planet aquarium (2013), Royal Arena (2017), and the Lighthouse in Aarhus (2022). Internationally, 3XN designed the Museum of Liverpool, Olympic House in Lausanne, and Quay Quarter Tower in Sydney.
The practice’s research and development arm, GXN, was founded in 2007 and focuses on sustainability and innovative materials. GXN employs about 20 researchers working on circularity, behavioral design, and digital tools. Recent work emphasizes integration of new technologies and ecological materials into architectural design, including upcycling and biocomposites.
3XN’s approach is characterized by careful study of user needs and behavior, aiming to shape spaces that are both adaptable and enduring.