Problem after window replacement | Measured incorrectly?

But shouldn't the window fitter point this out to me? How am I supposed to know as a layperson that the plaster has to be chiseled off beforehand?

A profile was not used, the windows were only screwed in through the frame.

But shouldn't the window fitter have pointed this out to me?

The installer not at all – but the survey technician apparently did not note next to the measurements that it is being installed in the existing structure.

How am I supposed to know as a layperson that the plaster has to be chiseled off beforehand?

It doesn’t have to be chiseled off.

A profile was not used, the windows were only screwed through the frame.

Yes, centered through the frame profile. So in this installation position not professionally done.

The installer was also the one who measured the windows. So is it allowed to install the windows only on the exterior plaster, or does that correspond to the common standards? If the installation position is not professional, could that at least be objected to, right?

The anchor must go into the wall, not into the plaster. The installation plane is fine, but then it should not be screwed through; instead, it should be mounted with brackets.

The installer was also the one who measured the windows.

A janitor service / all-round handyman with a big "do everything cheap and bad" sticker on his junk cart, I suppose (?)

Honestly, I would throw the windows out just as they are. How can someone produce such shoddy workmanship? It actually shouldn’t and can’t happen.

A janitor service / all-round handyman with a big "do everything cheap and bad" sticker on his junk cart, I suppose (?)

No, everything was done through a window installation company, the boss himself measured the windows, so I also assumed that everything would be done correctly here..