Built in the 1950s, the Bellahøj Houses in Copenhagen are home to more than 2,500 residents and represent an important part of Denmark’s architectural history. They were the country’s first high-rises – and for decades, they stood as a symbol of modern urban living.
But time has taken its toll. Many of the towers developed cracking facades, cold walls, drafts, and indoor climate problems, compounded by poor energy efficiency. ROCKWOOL was involved in the renovation of four of the towers, bringing them up to modern standards while preserving what makes them worth protecting.
Healthier, more comfortable homes – and lower energy bills
The renovation was extensive. Facades were completely replaced, and a substantial layer of ROCKWOOL stone wool insulation was installed underneath. Windows were renewed and insulated at the edges, kitchens and bathrooms were upgraded, and mechanical ventilation was introduced to ensure fresh air throughout.
Because the buildings went from having no insulation to a modern, well-insulated envelope, energy consumption dropped significantly as well.
According to preliminary data from KAB, the Danish non-profit housing association that administers the buildings, district heating consumption in the four towers (Ved Bellahøj Nord 7 and Ved Bellahøj Nord 16) fell by an estimated 38 percent in 2025, the first full year after residents moved back in, compared to 2021, the last full year before renovation began.
