Interior window sills - What depth or overhang?

So the roller shutters are installed with us and also set back later. I also think that's better, it's more wind-protected because of rattling. Now you have all made me quite confused about the windows.

I have now researched, so the guy is right, according to some DIN and rules etc., the window belongs in the middle of the middle third. That apparently has something to do with thermal bridges and dew point etc. It is definitely correct that way. I have also seen in the section that the architect planned it that way as well.

DIN 4208 supplement 2

The windows are installed like this in our house. The roller shutters don’t rattle. But I gain some space in the room.

Nevertheless, contrary to your opinion, what my GU told me is not nonsense.

If you build without insulation, I was told to install it in the middle. With insulation, further out

I’m telling you. Your general contractor placed the windows according to this old folk belief, but ordered the window sills in width as he usually does for ETICS walls. The window sill depth is his standard, but the wall structure is different. So, the absolute depth is "as always," but the relative depth (overhang) is not. He is right about "it’s always like that," and you are right about "it shouldn't be like that." The window sills protrude as far as the windows are installed "too deep."

Around me are lots of new houses, and everywhere the windows are installed in the outer third.

Exactly. New houses. And the practice of recessing the windows so deeply comes from the era of glazed wooden windows.

I told you. Your general contractor placed the windows according to this old folk belief, but ordered the window sills in the width he usually uses for ETICS walls. The window sill depth is his standard, but the wall construction is different.

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If only he had. Then Winnetou would now have 16 cm deep window sills, as it should be