time capsule handed over for the foundation stone
Joint press release by
IBA’27 – Internationale Bauausstellung 2027 StadtRegion Stuttgart,
Freunde der Weissenhofsiedlung e.V. and the state capital Stuttgart
The construction of the new Weissenhof.Forum officially began with the groundbreaking ceremony today, Wednesday, July 23 at 11 am. This was the starting signal for one of the central projects of the Internationale Bauausstellung 2027 StadtRegion Stuttgart (IBA’27).

As part of the groundbreaking ceremony, a time capsule was handed over to the construction company – a greeting to posterity and a sign of the beginning of a new era at the historic site.
“The Weissenhof Estate makes Stuttgart a globally recognized city of innovative architecture and modern architecture. The Le Corbusier houses of the Weissenhof Estate even became a UNESCO World Heritage Site in 2016. The Weissenhof Forum will pay tribute to this World Heritage Site and take a look into the future of architecture.”
– Lord Mayor Dr. Frank Nopper
The Weissenhof.Forum, which is being built at the entrance to the world-famous Weissenhof Estate, will in future serve as a central information and starting point for visitors. It combines exhibition areas, a media room, a store, catering facilities and event and work areas. The new building places particular emphasis on sustainability: constructed using wood and clay with a photovoltaic façade and a green roof, the building aims to achieve a climate-neutral plus-energy standard.
“Almost one hundred years ago, the Werkbundsiedlung at Weissenhof was built in just four and a half months, making a statement with global appeal. With the Weissenhof.Forum, this site now has a worthy entrance. The new building translates the language of modernism into the present – in form, technology and material. And it shows: If the client, construction industry and architecture act as equals and with determination, forward-looking buildings can be created in a short space of time, even today. The fact that this project is becoming a reality is thanks to the commitment of many people involved – first and foremost the City of Stuttgart and the association Freunde der Weissenhofsiedlung. In 2027, we will open the forum together – as an open place that invites people of all ages and backgrounds to discover the Weissenhof Estate and engage in discussions about the future, far beyond the IBA.”
– Dr. Gabriele König, Managing Director of IBA’27 GmbH and Andreas Hofer, Director of IBA’27
Suse Kletzin, Chairwoman of the association Freunde der Weissenhofsiedlung, adds:
“The groundbreaking ceremony marks the start of a new chapter in the history of the association Freunde der Weissenhofsiedlung. Many volunteers and full-time staff have been involved in writing it. We are looking forward to an exciting new time in telling the Weissenhof story and wish the City of Stuttgart as the client, the planners from Barkow Leibinger and the construction team from Zech Hochbau all the best for the construction period!”
Completion is planned by December 31, 2026
The planning and implementation will be carried out by the bidding consortium Zech Hochbau AG / Barkow Leibinger Gesellschaft von Architekten mbH, which won the Europe-wide award procedure with a design of high architectural quality and a forward-looking energy concept.
Following the demolition of the old building, work has now begun on the building construction. The Weissenhof.Forum is scheduled for completion and commissioning by December 31, 2026 – just in time for the 100th anniversary year of the estate and before the start of the IBA’27 exhibition year.
