In February 1962, the North Sea storm surge that killed 315 people in Hamburg hit Wilhelmsburg hardest. The Elbe island, lying barely above sea level between the Norderelbe and Suederelbe, was inundated almost entirely. Whole streets of workers' housing were destroyed. For decades afterward, the disaster defined Wilhelmsburg in the civic imagination: a low-lying, low-income district that the water could reclaim at any time.
Half a century later, the same geography that made Wilhelmsburg vulnerable made it interesting. In 2006, Hamburg announced that the island would host the Internationale Bauausstellung (IBA) -- an international building exhibition in the tradition that had previously transformed Berlin, Emscher Park and other German districts. The IBA ran from 2007 to 2013, with a parallel Internationale Gartenschau (garden show) occupying adjacent parkland. Together, they were intended to prove that Wilhelmsburg could be reimagined without being gentrified beyond recognition.
The IBA's built legacy
The IBA produced roughly seventy built projects across the island, ranging from individual houses to landscape interventions to infrastructure upgrades. The most visible cluster sits along the Inselpark, the former garden show site now converted to a public park. Here you find the Hybrid Houses by BeL Architekten -- mixed-use structures that combine ground-floor workshops with upper-storey apartments -- and the Woodcube, a seven-storey residential building constructed entirely from untreated timber, claimed as the world's first timber high-rise at the time of its completion.
"The question in Wilhelmsburg was never 'what can we build?' It was 'who are we building for?' The IBA answered that question more honestly than most German housing projects of the last thirty years." -- Cordelia Polinna, urban researcher, interview in Bauwelt 22/2023
The energy projects were equally ambitious. The Energiebunker, a converted World War II flak tower, was retrofitted with solar panels, a biomass boiler and a hot-water storage tank supplying district heating to surrounding blocks. The Energieberg Georgswerder, a former landfill mound capped and fitted with wind turbines, became both a renewable energy source and a public viewpoint offering panoramic views across the port.
Landscape as infrastructure
The IBA's less publicised but arguably more consequential contribution was its approach to flood protection. Rather than relying solely on higher dykes, the planners integrated water management into the landscape design. Retention basins double as parks. Green roofs absorb rainfall. Building plots in the lowest-lying areas were raised on artificial mounds, creating a topography that accepts periodic flooding rather than resisting it absolutely.
This "building with water" philosophy drew on Dutch precedents -- the Rotterdam Water Square, the Room for the River programme -- and adapted them to Hamburg's particular geography. The results are visible in the Inselpark, where a network of swales and ponds manages stormwater that would previously have overwhelmed the sewer system, and in the Elbinselquartier, where residential buildings are set back from the waterfront on elevated platforms connected by ramped promenades.
After the expo
The critical question for any IBA is what happens once the exhibition flags come down and the architecture tourists leave. In Wilhelmsburg, the answer is mixed. The showcase buildings are well maintained and generally occupied. The Inselpark functions as a genuine neighbourhood amenity -- busy on weekends, used for sports and events, integrated into daily life in a way that many German Bundesgartenschau legacy parks never achieve.
But the IBA's ambition to prevent displacement has been only partially fulfilled. Property values in Wilhelmsburg have risen steadily since 2013, driven partly by the IBA's success in improving the district's image and partly by Hamburg's broader housing market pressure. Rents in the streets closest to the showcase projects have increased by thirty to forty per cent in a decade. The subsidised housing quotas built into the IBA's own projects have held, but the surrounding privately-owned stock has repriced upward.
Wilhelmsburg remains one of Hamburg's most diverse districts -- roughly sixty per cent of residents have a migration background, and household incomes remain below the city average. Whether that diversity survives another decade of rising rents will depend on policies well beyond the reach of architectural exhibitions. The IBA built beautifully. Keeping Wilhelmsburg affordable is a different kind of design problem entirely.