There were three reasons for the renovation: the building was technically and aesthetically outdated, and there was a desire to apply the Witteveen+Bos PLUS working concept here in Deventer as well. Finally, there was a desire to demonstrate our expertise in the field of making existing buildings more sustainable to clients and visitors and to inspire them. The result is a building that has been optimally sustainable and where new and innovative solutions have been incorporated.

One of the most important sustainable solutions in the renovated building is the air/water heat pump. A system with ground storage is not permitted under the building. In addition to the heat pump, other measures have been taken to make the building more sustainable. The gas tap has been turned off for good, and we have said goodbye to an annual gas consumption of 50,000 m3.

Furthermore, the building has been completely re-insulated, including the facades, the floor and the roof. Energy-efficient LED lamps are used for lighting. In the meeting rooms, the presence of people is measured on the basis of carbon dioxide emissions: if no one is present, the lights go out. In addition, 326 solar panels have been installed on the roof of the building.

In addition to the measures mentioned above, many other innovative solutions have been implemented, resulting in an upgrade from energy label D to energy label A+++. Thanks to all these sustainable measures, the building's total energy consumption has fallen from 450,000 kWh to 250,000 kWh. Energy consumption per employee has been reduced even further, because before the renovation there were 240 workstations in the building, while after the renovation there are now more than 350.

The great thing about the whole project is that many different Witteveen+Bos employees worked on it and learned a great deal from it. They are now applying this knowledge about making existing buildings more sustainable in their work for our clients.