Tighten Hinge Screws

Often, a door sags because the screws holding the hinges (especially the top hinge) to the door or frame have become loose. Open the door and use a screwdriver to tighten all hinge screws firmly. If screws spin freely, the wood might be stripped; use longer screws or wood filler/toothpicks in the hole for better grip. This often corrects minor sagging and realigns the latch with the strike plate.