Doors bind and scrape for several reasons, but it’s frequently due to loose hinges or slight movement in the building, which throws door openings slightly out of square. When your door opens only part way and scrapes on the floor, not allowing it to open fully, don’t rush for the plane to remove part of the bottom of the door without trying this.
Gather your supplies
1mm shim of cardboard or timber; screwdriver; utility knife
Have a look around the door. The house may have moved slightly and the door is no longer square to frame or floor. This is seen as a gap that is wider at bottom than at top or vice versa. First, check all screws holding hinges are secure. If not, tighten. If you can’t get them to bite, remove screw and fill hole with glue and a matchstick, then drive in screw again. If door still binds on floor, run utility knife around bottom hinge to cut paint film.
Undo screws. If they have been painted over many times, place screwdriver in screw slot and tap with a hammer to loosen screws and to make sure screwdriver blade can get proper purchase.
Pull hinge away and place 1mm shim of cardboard or timber to fit behind hinge. Screw hinge back and check door operation. It should have lifted the closing bottom edge slightly. If door still binds, try a second shim. This should fix it. If the door is binding very badly, you may actually need to take the door off and plane the bottom edge, but it’s always worth giving this simple fix a go first.