Yes, sorry, it was indeed a structural engineer, and he will also finish something for me by the end of the week. But maybe there are still people with experience, I would still like to hear from them.
Yep, structural engineer ... you can't do without one or rather, you shouldn't. Although it doesn't necessarily have to be the structural engineer. In our case, it was the company that made the breakthrough, they looked at it closely to see whether it was load-bearing or not - it worked with one, with the other wall we had to come up with a plan B.