Water pipes in the wall - and now?

I had previously hired a structural engineer. Everything was planned and calculated as seen. So why should I be standing here, or what makes me a fool here? [/] I am not an expert and therefore specifically had the structural engineer come. He looked at everything and also received all the documents of the house. That I now have an unpleasant surprise is not tragic. [...] I was upstairs earlier, and these will be pipes for radiators. The bathroom is elsewhere and there is no drain in the wall. I would prefer to lay the two pipes outside or around them, possibly cut an opening at the top of the beam for this. The upper floor is mostly finished, so I would rather not open the floor again.

A structural engineer is neither a plumber nor a boiler repairman; he is only an expert in stability. You’re lucky these are not soil pipes but probably risers for water (possibly heating). I cannot completely rule out gas in the picture, but I rather assume water. You can easily have that relocated, nowadays even as a hose. Follow Yvonne’s suggestion and also provide the plans of the floors above and below for clarification, then you can get more precise help. Weakening a beam by cutting openings is not a good idea. Nobody here is against you, and if you find the tone here less like a girls’ boarding school, then just don’t go into the green—just a precautionary hint. When someone makes a really good joke—I love dry humor, and for that and for warning imitators in time I have thanked you properly—then even I do not go to the basement to laugh.

Thank you - So, now a bit more input. Unfortunately, the rear line is quite poorly positioned in the middle of the wall...
Best regards

Can it possibly be shifted like this? (green)

First clarify what kind of pipes these actually are. The black insulation looks like Armaflex high-temperature insulation. Do you have a solar thermal system on the roof? If not, it might have only been provision for a later installation and the pipes are unused.

Yes, you can definitely arrange it that way. You just have to see where you place the joints. Down below you might go into insulation/screed. It gets more difficult on the ceiling if nothing is hung there.

First clarify what kind of pipes these actually are. The black insulation looks like Armaflex high-temperature insulation. Do you have a solar thermal system on the roof? If not, it may have just been a provision for a later installation and the pipes are unused.

I turned on the radiator in the former parents' bedroom upstairs earlier, the position fits well... the pipes also got warm as a result. There is no solar system either.