Floor-to-ceiling windows on the upper floor without railing

when it comes to optics: There are venetian blind systems in which a nearly invisible (glass pane) is integrated as a fall protection

Really? Can you show a picture? I can't imagine what something like that looks like.

had that only temp. as an option, but we don't need it since we decided against floor-to-ceiling windows on the upper floor. Therefore, unfortunately, your only option is to google.

Just have some drawn in on the building permit and then simply don't build them. Many in our new development area only installed them years later.
I hardly believe that anyone will come to check.
Legally, if something happens, you are responsible.

That's how I would do it too..

40 cm parapet? That must be doubted!

? You can set parapets however you like. But if you think that 40 is not enough, I agree with you. Floor-to-ceiling windows ultimately have only one good feature – namely for those who walk by below or stand opposite and can look into the room. For me, in private floors everything below waist height is taboo; I would always recommend (masonry) parapets. With roller shutters, it applies: either up or completely down for privacy and intimacy, not just halfway. And then it’s dark :( Otherwise, for the question: alternative windows with a horizontal two-part division, fixed bottom plus top sash. But that is probably not desired?

Has anyone of you already gotten this through the official building inspection?

It was not a problem at all. At the inspection, there was a very simple provisional railing attached.

I wouldn’t take that risk with children in the household. We have lockable window handles everywhere in the apartment. A few weeks ago, the balcony door was open because the little child managed to get the key with the help of a stool and a box. The child was already standing on the potted plant to get a better view over the balcony railing. The older child can reach it anyway and also likes to leave the key in the handle...