What is a "residential floor"?

Phew, the factory plan only says "Basement 1-3" - the basement rooms will later be used as offices or common rooms with TV connection, etc. They do not differ in equipment from the other living spaces in the house.

Completely normal windows? 1/12th the size of the room area? Without a casemate?

The windows in the basement rooms are 60cm high, 100cm wide and have a sill height of 168cm, in front of them a neat PVC shaft.

Regarding [Kasematten] I honestly have no idea

The windows in the basement rooms are 60cm high, 100cm wide, and have a sill height of 168cm, with a nice PVC shaft in front.

Honestly, I have no idea about casemates

I’m telling you, and it’s stated in #10 from me with sources, what a living room is and needs.

Half a square meter of window with a PVC casemate in front of the window is not enough to a) be an escape route and b) the window size is not sufficient to provide adequate lighting in a room larger than 6/7sqm. Smaller rooms do not qualify as living rooms due to their tininess.
A room is not a living room just because it has a TV connection or carpet.
Converting it into a living space is borderline anyway, but everyone can do as they please (as far as I’m concerned).

Sorry, but you can forget about roller shutters for the basement. A basement window doesn’t need something like that if there is a casemate in front of it.

Regards, Yvonne

Hello Yvonne, sorry, I apparently overlooked that on my phone. It's a bit hectic here at the moment

Thanks for the detailed explanation. It's a pity, but if that's how it is, then so be it.

Der Ausbau zum Wohnraum ist eh grenzwertig, aber soll jeder machen, wie er will (von mir aus)

Hm well... I think I've opened the blackout curtains in my apartment exactly three times in the last five years... otherwise the light is *always* on here. For me, living space is where there is fast internet :P