Planning main bathroom with pre-wall installation

Yes, that's why I asked how far along they are with the pipe? Maybe it can still be "rerouted" or drilled through the ceiling at another spot from below. Such a hole is no longer a big deal these days. For the planning error, I would immediately put it on the general contractor's complaint list so that they cover the costs.

Unfortunately, rerouting is only possible to a limited extent. They now want to attach an angle at the ceiling so that the pipe can then run along the wall. The casing would then be quite narrow, but of course this "rerouting" would always be visible. Of course, I would have preferred if they had drilled through the ceiling at a different spot. But they would have had to do that last week when they did the other core drillings for the ventilation ducts. Unfortunately, the idea only came to me too late to move the gas boiler and thus the flue pipe to another spot. :-( The plumber who installs the flue pipe also said what poor planning this is; nobody puts a flue pipe in the bathroom. What costs is the general contractor supposed to cover in this case? I knew the planning.

We had similar mistakes too. A pipe came from above through the lower guest bathroom and unfortunately had to run across the ceiling because the original plan no longer worked (forgot why). The architect looked pretty guilty. We then agreed that he would take over the entire cladding including the spots. Now it looks as if the lighting had always been planned that way.

It's similar for you. The original position no longer works because of the rafter. So I would puzzle over it until I come up with an acceptable solution and then bill the general contractor for it.

We then agreed that he would take care of the entire cladding, including the spots. Now it looks as if the lighting had always been planned that way.

Show me.

The plumber who is installing the exhaust pipe also said what poor planning this is; no one installs such an exhaust pipe in a bathroom.

Is the exhaust pipe the one being discussed here (specifically when it is diverted around the rafter)?

We had such problems as well. A pipe came down from above through the lower guest bathroom and unfortunately had to run across the ceiling because the original plan no longer worked (forgot why). The architect looked quite guilty. We then agreed that he would take care of the entire casing including the spotlights. Now it looks as if the lighting had always been planned that way.

It’s similar in your case. The original position no longer works because of the rafter. So I would puzzle over it until I come up with an acceptable solution and put it on the general contractor’s bill.

I will check it out on site tomorrow, hopefully after the pipe is finished.
Of course it would be annoying if the "bend" is in such a place in the room that you could bump your head on it, etc., or if it looks very conspicuous. Then you can’t really "beautify" it anymore like you did with the spotlights, etc. I wouldn’t mind something like that, but from how the plumber sounded, you’d have to chisel off 50 cm of wall to hide everything. I also don’t feel like having a pipe or a protrusion constantly in my bathroom, especially nearly at head height. But I’ll see tomorrow.

I will also take a photo and post it here.

Is the exhaust pipe the one that is being discussed here (specifically regarding the offset around the rafter)?

Yes, exactly, the one in the middle of the gable wall in the bathroom. Next to the washbasin there is also a ventilation pipe for wastewater, which would of course also need to be offset, but that is at a different height. The exhaust pipe goes through the ceiling at about 2.2-2.3m, so still within the roof slope.

Yes, exactly, the one in the middle of the gable wall in the bathroom.

Then the idiot who planned this should redo the ceiling opening and have the pipe go through the exterior wall already on the ground floor and run up in front of the roof overhang. Unfortunately, routing it out in the attic is not possible because it would lie in the reveal area. But rerouting it with three bends is simply not visually appropriate for a new building.