I
IHB
So everyone would finish the floor PAST the door closer so you had to rebate the bottom of the door?
Nowt weirder than folk
If both floors are at the same height or a threshold strip is fitted then finishing past the door closer will hide the transition.
You won't want a lip to trip you into the room so best to fit a taper of some kind which will mean no need for a rebate and no gap under the door.