Actually a floor that’s halfway between street level and basement.
So it’s possible to build normal windows into it, but they’re very low to (or slightly below) the ground outside.
The only issue you can have is high humidity/mold due to the high temperature difference in summer but that can usually be adressed with proper ventilation at night.
What is souterraine?
A fancy French word for basement.
Actually a floor that’s halfway between street level and basement.
So it’s possible to build normal windows into it, but they’re very low to (or slightly below) the ground outside.
Cul-de-basse-fausse, that would be a fancy french word !
The only issue you can have is high humidity/mold due to the high temperature difference in summer but that can usually be adressed with proper ventilation at night.