COBIAX | United Nations Campus

United Nations Campus

All points set to sustainability.

Project countryGermany

Project locationBonn

Architect Stefan Lippert Architekten

Structural engineerR&P Ruffert

Executing companyFritz Meyer

The UN Campus is situated between the former high-rise houses of parliament of the former German capital, Bonn („Langer Eugen“, or Long Eugene) and the World Conference Center Bonn (WCCB). The extensions, with 17 storeys and three basement levels, was conceived with 330 employees in mind. Due to the very limited surface area for a high-rise building, of just 680 m2, the planners kept the encroachment on nature and the environment to the absolute minimum.

The United Nations focuses very strongly on sustainability. The building was designed as a passive house, and the use of natural energy sources is evident from the integration of four excellent conservatories on different floors of the building. Despite the small surface area, 12,000 m2 of sustainably optimized usage areas were created.


Wintergärten? Gleich vier.

The regular slabs consist of widely spanned, reinforced concrete slabs, that stretch between a decentralized, bracing core and reinforced concrete columns around the edges. With the two visible columns in the centre, the bearing of the main weight is assured.

In order to build a lighter structure, the weight of the slabs could not have been too high. Therefore, the weight-optimizing voided flat plate slab systems from Cobiax came into play. To prevent the required building technology, for the air conditioning and utilities, from affecting the height and flexibility of the room usage, all of the cables and pipes were integrated into the Cobiax slabs.

Weniger Beton

Höhere BNB-Bewertung: Gold-Standard

Overall, thanks to the use of Cobiax technology, the fresh concrete requirements for this building could be reduced by about 240 m3; therefore, the campus was awarded the highest BNB assessment, Gold.

This meant a reduction in CO2 emissions, by about 50 tons, compared to conventional solid concrete construction; an aspect that certainly had an influence on the United Nations‘ decision to choose this building method.

Images: © Stefan Lippert Architekten

Product line used

Cobiax SL

The modular product line for international use, thanks to the half-shell technology. This line of products enables effective transport and easy assembly.

Learn more.

More Projects




A service and logistics building is being constructed on the former industrial site as a modern superstructure with a wide range of possible uses.

Learn more.

Administration building for the German Bundestag


A Bundestag administration building is being built in Berlin. A lot of glass requires little weight. Cobiax was the logical choice.

Learn more.

ProSiebenSat.1 New Campus


Sustainability at its best: LEED certification in gold

Learn more.

Hafenpark Quartier South

Frankfurt am Main

Directly on the Main River, next to the new headquarters of the European Central Bank, the “Hafenpark Quartier” is being developed in Frankfurt’s Eastend district. Cobiax is being used to build the towers, which will contain several hundred apartments.

Learn more.

QH Track – Quartier Heidestrasse


100.000 m2 office space refined with Cobiax

Learn more.

A2 Business park


A modern commercial building is being built in Rothenburg directly on the highway. The building comprises a total of 10,000 m2 of commercial and office space.

Learn more.

Mathysweg Senior Citizens’ Center


The Mathysweg senior citizens’ center will be newly built and will become an open house with charisma and center character for 121 residents.

Learn more.



Cobiax increases the sustainability of a hospital extension.

Learn more.

Urban garden Hamburg


Sustainable urban development with Cobiax: A former shelter is everything in one: war memorial, place of creativity and event location. And now also an urban garden.

Learn more.

Museum Reinhard Ernst


A museum for abstract art is being built in a central downtown location.

Learn more.

IMoS (TU Berlin)


An interdisciplinary Center for Modeling and Simulation (IMoS) of the TU Berlin is being built on the East Campus in Charlottenburg.

Learn more.

Lobster Headquarters


Cobiaxing in Tutzing: The IT company’s new head office

Learn more.


All the news from the world of construction


At the beginning of every pioneering development, there are visionaries who turn theoretical possibilities into reliable technology. And strong people who are able to draw their will to succeed in the practical implementation of ideas, from the powers of possibility.

Jörg Tilmes

Managing Director

Volkmar Wanninger

Managing Director

Georg Miedzik

Managing Director
Wider Scopes as an obligation
Cobiax is more than just a brand. The catch phrase “Wider Scopes” extends far beyond the possibilities for modern slab technology. It is a commitment to providing more room for play for people, in the scopes and spaces in which they live and work.
Learn more


Never miss out on any news again. Click on the button below to register for our newsletter.

Cobiax Newsletter.

Become a part of something bigger?

Career and development at the innovation champion.