Berlin will dritte IBA ausrichten: Bauklötzchen staunen

The piece is published by taz, a left‑leaning German weekly known for in‑depth cultural and political analysis. It was written by journalists Uwe Rada and Gernot Knödler, who regularly cover urban development and social movements in Germany. Their expertise frames the discussion of the upcoming International Building Exhibition (IBA) in Berlin, linking it to historical precedents and broader European urban sustainability debates.

The article recalls the two previous International Building Exhibitions in the city: the post‑war Interbau (1957) and the celebrated IBA 1987, which introduced the concept of “gentle urban renewal” in Kreuzberg. Those initiatives combined grassroots pressure from housing activists, squatter movements, and cooperative projects with municipal support, establishing a model where public policy and civil society co‑create sustainable neighbourhoods.

Berlin’s Senate has approved a third IBA, scheduled for 2034‑2037, under the theme “Urban Transformation of the Built City.” The programme aims to promote climate‑resilient construction, repurposing underused spaces, and expanding housing without privileging large investors. Key focus areas include retrofitting existing quarters, converting vacant land, and integrating circular‑economy principles into building practices.

• Adaptive reuse of war‑time gaps (e.g., the “Wohnregal” project) that demonstrate affordable, community‑led development.
• Energy‑efficient retrofits such as solar thermal roofs, photovoltaic façades, and large‑scale heat‑storage tanks, exemplified by the converted WWII bunker in Hamburg‑Wilhelmshaven.
• Circular building criteria proposed by activist architect Theresa Keilhacker, suggesting that material reuse become a mandatory procurement condition for all IBA projects.

The earlier IBA in Hamburg mobilised €90 million of public funds, which catalysed €700 million in private investment and an additional €300 million of public spending. For the Berlin edition, the Senate has earmarked €70 million, indicating a more modest public budget but relying heavily on private capital and European sustainability grants.

The article stresses that successful IBAs hinge on robust IBA‑Governance, a transparent decision‑making structure that includes NGOs, housing co‑ops, and citizen assemblies. Figures such as Franziska Eichstädt‑Bohlig and Marta Doehler‑Behzadi argue for keeping community voices central, warning against a top‑down “high‑rise‑only” approach championed by some political factions.

Planners identify the S‑Bahn ring—the transit belt encircling Berlin’s inner city—as a strategic corridor for pilot projects. The area offers high connectivity, allowing for mixed‑use developments that blend residential, commercial, and green infrastructure, thereby reducing car dependency and supporting biodiversity corridors.

Beyond Berlin, the article references IBA‑related projects in Thuringia’s Schwarzatal, Brandenburg’s Först‑Pückler‑Land, and Saxony‑Anhalt’s shrink‑city programmes, illustrating a pan‑European trend toward integrating climate adaptation, renewable energy, and social equity into urban planning.

If the Berlin IBA follows the outlined model, it could deliver:

• Hundreds of energy‑positive or net‑zero apartments built on reclaimed sites.
• Increased affordable housing stock through cooperative ownership structures.
• Demonstration of circular construction that other European cities can replicate.

The upcoming Berlin IBA represents a continuation of Germany’s tradition of experimental, socially driven urban exhibitions. With a clear emphasis on climate resilience, circular building, and participatory governance, the initiative aims to set a benchmark for sustainable housing across Europe, leveraging modest public funding to unlock substantial private investment while keeping community needs at the forefront.