If the interior door is a hollow core door, you should check for holes and other impact damage on both sides. A solid wood paneled door should be checked for splitting and looseness of joints. The hinges should work freely without binding. The door should close in the jamb. Before you close the door in the jamb, make sure that the door latch works properly. The last thing you want to do is lock yourself in! Sometimes, if the door frame or door is out of square, the door will not close in the jamb. Sometimes the door latch bolt does not line up with the jamb strike so the door will not latch closed. Sometimes a door will not open all the way because it rubs against the floor. Particularly where there is no doorstop, check the wall behind the door for a "doorknob impact" hole. Be sure to note door knob and door latch problems such as missing, loose, or malfunctioning parts. Sometimes you cannot properly check a door because of attached clothes hangers or personal property items in the way.

In addition to the items checked on interior doors, exterior doors have the added function of keeping the weather out and providing security. Exterior doors should fit tightly in the jamb when fully closed. Check for peeling and flaking paint on both sides of the door. Your home inspector should pay particular attention to the condition of the exterior trim and threshold. If there is rot in the threshold and adjacent trim, there might also be rot in the sill underneath.

If you are inspecting a room, turn your attention now to the heat source.