Adjust a Sticky Interior Door That Won’t Latch

You close the door and it kisses the jamb, then stops short of that satisfying click. Or it latches only if you lift the knob. Seasonal humidity swells doors; loose hinge screws let the slab droop. Most interior latch problems are alignment, not a new door.

This covers hollow-core and solid interior doors with a standard spring latch — not keyed entry sets or warped exterior slabs.

Quick diagnosis

Open the door slowly until the latch just meets the strike plate. Look:

• Latch hits below the hole → door sagged, or strike sits too high.
• Latch hits above the hole → less common; strike too low or hinges binding oddly.
• Latch hits the plate face but not the hole → plate needs to move toward/away from the stop.
• Door rubs the head jamb or latch side → swelling or hinge shims needed before the strike will ever line up.

Mark the scrape with a pencil while the door is closed as far as it will go.

Tighten hinges before you move wood

1. Open the door. Check every hinge screw in both the slab and the jamb.
2. If a screw spins uselessly in the jamb, replace it with a longer screw (often 2½–3 inch) aimed into the stud behind the jamb — especially on the top hinge. That alone pulls many sagging doors back up.
3. Do not over-crank into particle-core slabs; snug is enough.

Close and test the latch again before chiseling anything.

Move or enlarge the strike carefully

If the latch is only 1–2 mm off the hole:

1. Unscrew the strike plate.
2. Extend the mortise slightly with a sharp chisel in the direction you need, or file the plate opening if your plate design allows.
3. Reinstall and test.

If the latch is clearly low because of sag and longer top-hinge screws helped but not enough, a thin cardboard shim behind the bottom hinge leaf (door side) can tilt the slab up a hair. Add one layer at a time.

Never grind a huge oval into the strike “so it always catches.” That teaches the door to slam and look sloppy.

Sticky from humidity

In muggy months, rub the high spot (often the latch edge near the top) lightly with sandpaper, then seal bare wood with paint or polyurethane so it does not drink more moisture. Removing too much wood in winter means a winter gap and noise.

Mistakes that make it worse

• Planing the whole latch edge on day one without checking hinge screws.
• Using drywall screws in hinge holes — they snap under shear.
• Bending the latch with pliers so it “reaches.” Soft metal latches fail soon after.
• Forcing a door that has a packing blanket or rug bunched under it — clear the swing arc first.

When to stop

Stop if the jamb is split, the frame is visibly out of square after a foundation shift, or the door is an exterior fire door with code hardware you should not modify. Warped solid doors sometimes need replacement, not another strike move.

Also stop if you smell mold when you open the latch mortise — fix the moisture source.

FAQ

Why does it only stick in summer?

Wood gains moisture and swells across the grain. Slight seasonal plane-and-seal is normal in older houses.

Can I just replace the latch?

A new latch the same backset can help if the old one is worn, but it will not fix a door that sits low.

Hollow-core door feels light and racked.

Longer hinge screws into the stud still help. If the top rail is crushed around hinge screws, a hinge-repair kit or thin wood filler plug may be needed before screws bite again.