Floor plan draft for a 220m² single-family house

Nonsense. Construction botch should not be soundproofed, but avoided. At least with houses that are still in the planning stage. What one would do with renovations is not the standard for new buildings.

So what would be the solution? To throw the floor plan overboard again?

Go through every point with horse and rider, why it is the way it is. Also, why the corner is missing. Not because of me, but because the drainage is there. So either the corner is missing at the top and at the bottom as well, or not at the bottom and not at the top either, or missing at the top and not at the bottom, and clarify how to deal with that. The bathroom hasn’t been there as long as the corner has been missing – a room was moved without any consequences. So who wanted this corner like that and why, and how does the bathroom handle it. With the drainpipe as a cinema sound experience bonus track, certainly not with insulation.

Also, why the corner is off. Not because of me, but because the drainage is there. So either the corner is off at the top and at the bottom too, or not at the bottom and not at the top either, or off at the top and not at the bottom, and clarify how to proceed with that. The bathroom hasn't been there as long as the corner has been off – a room was moved without any consequences. So who wanted this corner like that and why, and how does the bathroom deal with it. With the drain pipe as a bonus track for cinema sound experience, certainly not with insulation.

Corner off? What do you mean by that? I'm having trouble understanding that and deriving a discussion approach with the architect from it.

11ant, when does your panic mode end? Running drains through slopes in ceilings and then soundproofed downwards is no longer rocket science. The old rule of bathrooms being stacked on top of each other seems somewhat outdated and is not even maintained in floor plans of budget builders (where I would really worry about soundproofing). I think you are a bit stuck here.

And dear OP, what you urgently should do is turn off the miserable internet. Either you trust your architect and their verifiable experience or you don't. Why do you put the opinion of an anonymous internet user above that of your paid professional? In a discipline where there can certainly be different, understandable positions.

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You are right. The internet is really good. I have taken away many valuable tips here that will also be implemented. I don’t want to miss that. I have also addressed the issue of drainage and discussed it with the architect or explicitly asked about it. So, you (hopefully!) are right.