The modernisation of Berlin's Olympic Stadium through a consortium led by Walter Bau-AG was completed in summer 2004. Without changing the historical character of the stadium, the reconstruction work adapted the building to the requirements of a modern arena. The design group ARCADIS Olympiastadion was contracted by Walter Bau-AG to perform the general engineering design.

The renovation took about four years and cost around € 242 million. The result: a multifunctional stadium with about 76,000 covered seats, 98 boxes, 15 so-called sky boxes, approximately 4,000 comfortable business seats, and an underground car park for roughly 1,000 cars. All work took taking place while the stadium was in use. During this time, a minimum capacity of around 55,000 to 70,000 seats, depending on the event, was guaranteed. Work is carried out in segments, each segment being completed before the next one is begun with. This demands sophisticated planning and smooth handling. Works were completed and delivered to the operating company in 2004. The modernised arena hosted the final round of the world football championship in 2006.