Drain pipe not under the screed

In a new building, there can be no valid reason.

A drain pipe in the kitchen is somewhere between 40-60mm in diameter. Screed at least 6cm thick, insulation and impact sound insulation underneath, on the ground floor >6cm, sometimes significantly more if there is no insulation under the floor slab. The drain pipe is therefore usually not in the screed at all, but in the insulation layer below. Very strange.

Unfortunately, I can't find a better photo at the moment, but you can see a little bit. This is what it looks like at the colleague's upstairs in the bathroom. Since the diameter of the pipe is too large and the slope must be maintained, about 4-5 cm were chiseled away from the ceiling.

Hi

Well, when lifting into the concrete, there would certainly be someone here who sees structural problems.
As executed, it is not nice but certainly not a technical disadvantage.
The screed cannot be weakened where there is none.

The only real problem that can arise with this execution is that connections protrude too far into the [Spülenunterschank] and thus interfere with possible installations.

Has the client provided the installer with a kitchen plan?

Olli

Um... have you already seen that the water pipes are not plastered in, although the interior walls are already finished and plastered!!! So the screed is not your only problem Such a thing I see for the first time, that the piping ([Warm- und Kaltwasser]) is not plastered in. Is that how it is done now?

There can be no valid reason for a new building.

First, listen carefully - just because your imagination doesn't come up with a valid reason doesn't mean there couldn't be one. Several come to mind right away - such as a late planning change by the client.