Z2 office refurbishment highlights sustainable construction in Stuttgart

ZÜBLIN has completed the refurbishment of its corporate building, Z2, located in Stuttgart-Möhringen. The six-storey structure, known for its curved facade design, underwent an 18-month renovation aimed at reducing operational carbon emissions and improving energy efficiency. The project is part of the STRABAG Group’s broader goal of achieving climate neutrality by 2040.

The refurbishment included the use of CO₂-neutral in-situ concrete for structural components, rock wool insulation made from natural stone, and facade elements containing approximately 65% recycled aluminium. A green facade was also installed, designed to help improve air quality, reduce noise, and filter dust. The greenery is irrigated via a 60,000-litre underground rainwater tank.

The building’s energy supply combines a four-wire heat pump system capable of heating and cooling, as well as rooftop photovoltaic panels and battery storage units. An electric vehicle charging infrastructure was also included.

The project makes use of Pilkington Mirai™, a low-carbon glass designed to meet energy performance standards while reducing the environmental impact of glass production. Combined with other Pilkington products, the glass contributes to the nearly zero-energy status of the building.

In addition to reducing its operational footprint, Z2 incorporates recycled materials and is part of a pilot initiative, renew:glass, which reintroduces used glass from the building into the manufacturing cycle. This approach supports circular economy goals in construction.

ZÜBLIN worked with several partners on the Z2 project, including Flachglas MarkenKreis, Johann Schirmbeck GmbH, and Forster Fassadentechnik GmbH. The building serves as a case study in adapting existing properties to meet modern sustainability and energy efficiency standards.