Oh, one other thing we did was (opaque) glass panels in the door and a transom window above, to get natural light into the little landing. That's worth doing if the hallway has no windows.
The door we bought with panels. I don't remember the transom being especially hard - I think it's just held in with beading on each side. Maybe sealant as well but I don't think so.
Oh, one other thing we did was (opaque) glass panels in the door and a transom window above, to get natural light into the little landing. That's worth doing if the hallway has no windows.