Supporting Companies

Using a holistic planning approach, Stefan Krämer, the founder of Integral Ingenieure, and Oliver Ringelstein created an optimal solution for the construction and operation of the INTEWA building. Stefan Krämer is a lateral thinker with a particular affinity for energy and ecologically sensible solutions.

  • Thermal insulation certificate
  • Summer thermal insulation using building simulation
  • Energy certificates audit according to DIN 16247
  • Energy consulting
  • Building services planning


Bonrath stands for commercial and industrial construction, steel construction, house construction and container construction. For INTEWA, the steel hall integrated in the KFW55 overall concept was cleverly adapted to the solid construction. The construction process went extremely smoothly.

The INTEWA building sits on a 6 m high layer of clay on a slight slope. The civil engineering works started during a rainy season. Sanders Tiefbau mastered the very difficult soil conditions and distinguished itself as an absolute specialist for civil engineering work.


Norbert Schnitzler from Schnitzler Elektrotechnik is a craftsman, as you can rarely find today. Down to earth, reliable, fast and experienced. At the new INTEWA building, he was responsible for almost the entire electrical engineering and did an excellent job.


Mr. Franke from EUT Haustechnik is not only an INTEWA regular customer, but also a picture book installer for ecological building services. He is extremely experienced and gave us excellent advice and support for our new building.