The window company is not delivering the agreed roller shutter boxes

There is no double-wing window attached to the lintel and the windows are already sagging.

So our windows are only attached to the reveal, but with huge screws. Not at all to the lintel, not even the patio doors, and this was really done by a professional company.

So our windows are only attached at the reveal, but with huge screws. Not at the lintel at all, not even the patio doors, and that was really done by a professional company.

Are the windows also installed in the insulation?

We have no insulation. 36.5 Poroton bricks exterior wall.

Do you maybe have a tip on how I can get craftsmen to accept possible advice from me as politely or friendly as possible?

That was good. No, that’s not possible. With the trained ones, you can’t get past their patron saint, St. Just-so, and with the ones let’s call "the fearless," there is firstly a linguistic barrier and secondly a cultural one: their countries of origin often belong to the survivors of socialism, meaning the craftsman’s grandfather was used to improvisation caused by shortage economy, in which mutual help did not ask for master craftsman certificates. With DIN, RAL & co you at most out yourself as a funny paperwork person.

Believe me @11ant, we’ve done it all (at least we think so), yet the result is suboptimal.

Yes, I believe you and thanks for the note – so: "Edit to post #18: I gave my half dozen tips without any guarantee" :-)

Do you perhaps have a tip on how I can politely or friendly get craftsmen to accept any advice from me? I imagine that's not so easy. More like asking questions whether this or that shouldn't be done this or that way? Or making clear demands? This has to be done this or that way? Thanks!

You're more likely to teach a bear to dance.

3. For safety, read up a bit yourself on what should be considered during installation (as with the ETICS, there are plenty of expert videos showing examples of horrors);

5. Plan vacation days to show presence on site – see point 3 for this, because playing the nitpicking inspector who then embarrassingly cites the wrong standard achieves nothing except destroying their own authority.

That was good. No, that’s not possible. When dealing with trained professionals, you can’t get around their patron saint, St. Knowitall;

How do these points fit together then? I can save myself the reading and the vacation days if I can’t intervene anyway. Or what am I not understanding?