We had the VQC (similar to TÜV) accompany us in 2020. Very satisfied and top qualified people. However, in my case, it was not a new building but a complete renovation of a multi-family house (1920) + extension. With their support, I was able to get to know the house very well, create a renovation plan, and always have a very good feeling about the work carried out. In other words, I was continuously advised and then able to talk to the craftsmen of individual trades and accordingly ask the right questions. Before that, I had zero knowledge of construction and would get the experience again at any time through a building expert.