In a new apartment a door between two rooms doesn’t open and will remain shut. Even if the door could be opened, there will be furniture on one side of the door. Does the door need a mezuzah?
I assume at one time it was made to open and it still has the door frame. If that is the case, some say it does still require a mezuzah. The issue is how you distinguish between the case of Shulchan Arukh and the case of Rema in Shulchan Arukh YD 286:18
בית שיש לו פתחים הרבה, אף על פי שאינו רגיל […]