The opening of the Berlin Modern Museum, a planned extension of the Neue Nationalgalerie, has been delayed until 2030 due to significant moisture damage and microbial contamination in its foundation, floors, roof coverings, and exterior walls. Originally laid in February 2024 with a projected 2027 opening, the museum's construction costs have surged from 200 million to 507 million euros, according to Monopol. A spokesperson for the Prussian Cultural Heritage Foundation stated that repairs are underway but will push completion back by approximately eight months.
This delay matters because the project has faced sustained criticism since its inception in 2019 over design efficiency and structural flaws, particularly the heavy use of concrete by Swiss architects Herzog & de Meuron. Conservation experts warned in 2022 that the building would require an energy-intensive ventilation system to maintain temperature equilibrium, with architecture critic Nikolaus Bernau calling it "an absolute disaster" ecologically. The escalating costs and technical failures underscore broader concerns about ambitious museum construction projects and their long-term sustainability.