Hello f-pNo,
On the other hand, today the foreman from the shell builders said: "Good that it was noticed so early, so something can still be done."
Of course, if the windows had been ordered to the wrong size, the shell builder would have had to pay for it.
This post was based on my assumption that solving the defect would be significantly more difficult.
That was the basis of my response and also that you initially asked in the forum instead of asking your general contractor, site manager, or your expert. It is always difficult for me to grasp emotions via the forum, but with you I did sense the fear that mistakes had been made that could no longer be corrected. That is practically impossible in the shell construction unless, for example, the shell was built too small from the start or the foil above the first row of bricks was forgotten, etc.; that would be a severe test.
If you do not convince yourself to develop trust – especially since you chose a reputable builder – you will be a nervous wreck with further proceedings as before; that is not worth a construction project! This also includes, when deviations (defects would be after handover) become apparent, first seeking a conversation with your site manager. If you believe you cannot fully trust him, consult your expert.
In one of our construction projects, a window opening was completely forgotten. It can happen since many people work towards the success of a single-family house. The question is – as you rightly wrote – how one deals with it. That really reads well with you
Rhenish greetings