How to Fix a Door Latch That Won't Catch in 15 Minutes

Why Your Door Won't Stay Closed

It is one of the most frustrating minor annoyances in a home: you pull a door shut, only for it to slowly drift back open. When a door refuses to latch, it is almost always due to a misalignment between the latch bolt (the spring-loaded metal piece extending from the door) and the strike plate (the metal plate mounted on the door frame).

As houses settle or seasonal humidity changes, doors can sag slightly, causing the latch to strike too high, too low, or too deep. Fortunately, you do not need to call a carpenter to fix this. You can easily solve this problem in about 15 minutes with a few basic tools.

Tools and Materials You'll Need

• A Phillips-head screwdriver
• A small metal file (or a rotary tool)
• Lipstick, chalk, or a dry-erase marker
• Wood toothpicks and wood glue (optional, if screws are loose)
• A hammer and chisel (optional, for shifting the plate)

Step 1: Locate the Misalignment (The "Lipstick Test")

To fix the alignment, you first need to find out exactly where the latch is striking the frame. The easiest way to do this is with the lipstick test:

• Apply a small amount of lipstick, wet chalk, or dry-erase marker to the flat edge of the door latch bolt.
• Close the door normally. Turn the doorknob to retract the latch, close the door fully, and then release the knob so the latch springs forward and strikes the plate.
• Open the door and look at the strike plate. The lipstick or marker will leave a clear smudge, showing you exactly where the latch is hitting.

Step 2: Tighten the Hinge Screws

Before modifying the metal plate, check if the door itself is sagging. Often, a door sags because the hinge screws have worked loose over time, tilting the door down and causing the latch to strike too low.

Take your screwdriver and tighten all the screws on both the door-side and frame-side hinges. Focus especially on the top hinge. If a screw spins in place without tightening, the wood screw hole is stripped. To fix this, remove the screw, jam a wood toothpick dipped in wood glue into the hole, break it off flush, and then drive the screw back in. This gives the screw fresh wood to bite into.

Close the door to see if tightening the hinges resolved the latching issue. If it did, you are done!

Step 3: File the Strike Plate (For Minor Misalignments)

If the hinges are tight but the latch is still hitting the strike plate slightly too high or too low (by 1/8 inch or less), the easiest fix is to enlarge the opening in the strike plate.

• Use your screwdriver to remove the strike plate from the door frame.
• Secure the plate or hold it firmly, and use a metal file to grind down the inner edge where the lipstick smudge was located (usually the top or bottom lip of the hole).
• Reinstall the strike plate and test the door. If it still doesn't latch, remove it and file a tiny bit more until the latch clicks smoothly into place.

Step 4: Shift the Strike Plate (For Major Misalignments)

If the alignment is off by more than 1/8 of an inch, filing won't be enough. You will need to physically move the strike plate up or down.

• Remove the strike plate.
• Fill the old screw holes by inserting glue-coated toothpicks or wooden dowels and letting them dry. Cut them flush with a utility knife. This prevents the screws from slipping back into their old positions.
• Hold the strike plate in its new, correctly aligned position and mark the new screw holes with a pencil.
• Use a chisel or utility knife to score away a small amount of wood from the door frame mortise (the shallow recess the plate sits in) so the plate can sit flush in its new position.
• Drill pilot holes and screw the strike plate back into its new position. Your door should now latch securely and stay closed!