Not the GP, but there are some regulations about windows, not sure if local or EU-wide. Windows at floor level above ground level must not be fully openable or must have an outside barrier. But thats a pretty sane restriction, given those windows are basically just glass doors to nowhere.

I would be amazed if much of the US didn't have a similar building code that there must be a railing if there's a possibility of easily falling out the window/door.