Door Won't Latch? Fix the Strike Plate in 4 Steps

TL;DR: A door that won't latch is almost always a strike plate alignment problem. Mark where the latch hits with lipstick or a marker, file the strike plate hole for misalignments under 3 mm, chisel and reposition the plate for larger gaps, and tighten or replace loose hinge screws that let the door sag.

_Last reviewed: July 2026 · 4 min read_

You push the door closed and the latch bolt stops short of the hole—the door bounces back or needs a shove to catch. It's frustrating, common, and almost always caused by the strike plate sitting a few millimeters off from where the latch wants to land. Here's how to fix it yourself in four steps, whether the gap is tiny or the door has sagged half an inch.

Okoniq Property Hub logs every small repair like this—snap a photo of the old strike plate position and the fix, tag the unit and door, and keep the history for the next owner or tenant.

Why Does a Door Stop Latching?

Wood swells and shrinks with humidity, hinge screws loosen over time, and the door frame shifts as the house settles. The latch bolt stays in the same place on the door, but the strike plate in the jamb moves—sometimes up, sometimes toward or away from the door stop. The result: the bolt hits metal instead of sliding into the hole. If you see paint or wood dust on the strike plate face or the latch itself, that's the misalignment wearing both surfaces. Fixing it now prevents the bolt from deforming or the plate from chipping out of the mortise. For similar hardware wear, see door hinge maintenance when a door sags or squeaks.

Most interior doors have a 2-3/8 inch backset (the distance from the door edge to the center of the knob); exterior doors are often 2-3/4 inch. The strike plate hole is drilled to match that dimension, but if the door has dropped 5 mm, the latch now sits 5 mm lower than the hole center.

How Do You Mark Where the Latch Hits the Strike Plate?

Close the door slowly and watch where the latch bolt touches the strike plate or jamb. You'll see a shiny line or a paint scrape if it's been happening for a while. For precision, rub lipstick or a washable marker on the end of the latch bolt, then close the door and let it mark the plate. Open it again and you'll see exactly where contact happens—top edge, bottom edge, or off to one side.

If the mark is less than 3 mm from the hole, a metal file will solve it. If the mark is 5 mm or more away, you'll need to move the plate. If the door sits crooked in the frame—one corner rubbing the jamb—check the hinges first; sagging at the top hinge drops the latch side and throws off alignment.

When Can You File the Strike Plate Instead of Moving It?

For misalignments under 3 mm (about 1/8 inch), file the strike plate hole to enlarge it in the direction of the mark. Use a flat or round metal file—work slowly, checking fit every few strokes. The bolt should slide in with light finger pressure when you test the latch by hand. Remove the plate if filing is easier off the jamb, but most people leave it in place and file at an angle.

Once the bolt fits, test the door closed a dozen times. The latch should engage smoothly without forcing the knob. If you had to file toward the door stop, the bolt might protrude slightly when latched—that's fine as long as it holds. If you filed toward the hinge side and the bolt still misses, the gap is too large for filing; move to repositioning. For small hardware upgrades that complement this kind of repair, see cabinet hardware upgrade when refreshing a kitchen or bath.

How Do You Reposition a Strike Plate for a Larger Misalignment?

Unscrew and remove the strike plate. The latch has left a mark on the bare jamb—measure the distance from that mark to the existing mortise. If the latch is hitting 6 mm below center, you'll move the plate down 6 mm. Use a sharp chisel to extend the mortise in that direction—chisel with the bevel facing the waste wood, paring away thin layers until the new mortise depth matches the old. If you're moving the plate more than 10 mm, you'll have a gap where the old mortise was; fill it with a wood shim, glue it in place, and trim it flush before repositioning the plate.

Mark the new screw holes with a pencil, drill pilot holes to prevent splitting, then screw the plate into its new position. Test the door—latch should drop into the hole with no resistance. If the door still won't latch and the plate is now aligned, the problem is hinge sag; proceed to the next section.

What If the Hinges Are Causing the Misalignment?

A door with loose top-hinge screws sags away from the strike plate at the latch side. Open the door and wiggle it at the knob—if it lifts a few millimeters, the hinges are the culprit. Tighten all hinge screws with a screwdriver (not a drill—overtightening strips the hole). If a screw spins without tightening, the hole is stripped. Remove the screw, tap a wooden golf tee or a glued toothpick into the hole, trim it flush, and drive the screw back in. For exterior doors or heavy solid-core doors, replace short hinge screws with 3-inch screws that reach the wall stud behind the jamb.

Close the door and check latch alignment again. Tightening the hinges often lifts the door back into position, and the latch will line up with the original strike plate hole. If the door now latches but rubs at the top corner, the bottom hinge may need a shim behind the hinge leaf—slip a piece of cardboard between the hinge and the mortise to push that corner outward.

Should You Log This Kind of Repair?

Yes. A door that won't latch today will need the same fix in two years if humidity or settling caused it. Take a photo of the strike plate before and after, note the date and which door (bedroom 2, basement, pantry), and attach it to the property record in Okoniq. If you moved the plate, measure and write down the offset—"moved strike plate 8 mm down"—so the next repair starts with context. Tenants or buyers often judge maintenance quality by details like doors that close smoothly; logging the fix shows you stay ahead of small problems. For similar small-part tracking, see dimmer switch installation when replacing switches or outlets.

FAQ

How long does it take to fix a door that won't latch?

Filing a strike plate takes 10-15 minutes. Repositioning the plate with a new mortise takes 30-40 minutes. Tightening hinge screws takes 5 minutes. If you need to fill a stripped screw hole or chisel a new mortise, plan for 45 minutes start to finish.

Can I use wood filler instead of a shim for the old mortise gap?

Yes, but only if the gap is less than 5 mm. Apply the filler, let it cure fully, then sand it flush. Larger gaps need a wood shim glued and trimmed—filler alone will crack or fall out when you screw the plate back on.

Why does the door latch in winter but not in summer?

Humidity swells the wood in summer; the door edge moves closer to the jamb and the latch no longer reaches the strike plate hole. Planing the door edge a few millimeters gives year-round clearance, but try filing the strike plate first—it's faster and reversible.

Do I need to remove the door to fix the strike plate?

No. Leave the door on the hinges and work with it open. You only remove the door if you're planing the edge or replacing all the hinges at once.

Will this fix work on exterior doors?

Yes, but exterior doors are heavier and the latch takes more force. Use 3-inch hinge screws to anchor into the stud, and consider a heavy-duty strike plate with a 1-inch or longer bolt pocket if the original plate is flimsy stamped metal.

This is educational information, not professional carpentry or structural advice. If the door frame is cracked, the jamb is rotted, or you're unsure about cutting into the mortise, call a carpenter or handyman.