Can the window sash still be corrected?

We are now noticing during the shell construction that the window rebate is different everywhere. It varies from 2 to 6 cm.

The window installer says he needs at least 35 mm.

The contractor says the interior wall including insulation will still be reworked.

Is this usual or was this really botched or not measured correctly? Can something just be cut off or patched on?

Dear Heidi, I would like to help you, but I am having trouble with your question right now. Even the photos do not explain it to me. Just so much: "ranpappen" is just as stupid as "absägen", although sawing would technically be more acceptable. Please ask differently.

The white interior wall should be at least 35 mm narrower on both sides than the red wall according to the window installer. And it should be the same on both sides so that from the outside you see the same amount of the white plastic frame on both sides. But in our shell construction, it is totally different. Sometimes it is only 20 mm, sometimes it is even 60 mm. Where it is only 20 mm, 15 mm would have to be cut away. And what do you do on the side where it is a full 60 mm (in the photo where the level is completely covered)? Our builder just said "will be reworked". So something must be "glued on" there so that of the 60 mm only 35 mm remain.

Just ask the site manager how he does it. Is that a Poroton wall with a brick wall built in front of it?

Now you most likely have an execution plan in which all dimensions are recorded. This was most likely signed off and approved by you before the first brick was laid. Then construction takes place. Now simply compare your plan with reality. Everything that does not match must be corrected. However, if the plan was approved like this, then...

What is "always gladly accepted" are klinkers in special formats and/or raw construction wall and opening dimensions that break the grid. If you then don't want to saw when laying the klinkers - also because it might look crappy - then such phenomena almost inevitably occur. Could that be the case here?