Crack in window frame (plastic)

Well, but a thermal bridge or, on the other hand, consequential damages are certainly more serious.

since the installer had initially concealed this with paint. This only became clearly apparent after we noticed the spot and then cleaned it a bit.

In my opinion, the line between a minor repair by informal means and criminal intent has already been crossed.

Yes, we have 5 years of warranty according to the Building Code. Unfortunately, the replacement is not without complications, as the window probably needs to be cut out, and subsequently the plaster, etc., has to be restored.

That is not your problem, but I advise you to have the condition documented by an expert before and after the replacement. Incompetent people manage this "with ease," so that later it will be said "Operation successful, patient dead," meaning the window itself is flawless, but the reveal looks like it’s from a special forces training building.

Yes, I see it that way too. Unfortunately, there is no insight on the part of the assembly company.

Only legal assistance will probably help.

That is a defect, especially if it has already been painted over, it must have happened during installation. If the normal way doesn't work, consult an expert. And then it must be clarified how the crack came about. But actually, one wouldn't only notice that a year later, right? At the latest when cleaning the window, I should see it?

This is a defect, especially since it has already been painted over, it must have happened during installation.
If the normal way doesn't work, involve an expert.
And then it has to be clarified how the crack came about.

But actually, you wouldn’t notice this only a year later, would you? At the latest when cleaning the window, I should see it, right?

Until the handover of the house, the area was completely covered with the edge insulation strip. After moving in, we didn’t notice it immediately because the crack was covered with paint.

After another objection, I have now received the following feedback:
Option 1: milling out the damaged area and then re-bonding the area. The whole thing should then be covered with moldings, as the damage would otherwise remain visible.

Option 2: replacing the entire window frame, which is expected to cause damage to the plaster and the exterior area.

The construction company prefers option 1. According to their statement, no disadvantage would arise for us.
However, we have concerns that the area might continue to crack, although the damage would not be immediately visible since it would be covered.

What do you think?

Where there is a crack, there is tension inside. Makeup can't help with that. Broken is broken and can only be replaced by a whole. We are not talking about a scratch here.