Door Won't Latch: How to Diagnose and Fix It
What this comes down to
- A door that will not latch rarely has a bad latch. The bolt and the strike plate have drifted out of line.
- Chalk on the end of the bolt leaves a smear on the strike plate that shows which way to adjust.
- Schlage says a deadbolt pocket should be 1 inch deep, and a shallower one stops the bolt short.
- Weatherstripping that is too thick can hold a door off its strike plate.
- A door that has to be lifted to lock has sagged on its hinges, and moving the plate only hides that.
- A keyed lock on the inside is not the fix, because egress doors must open without a key.
A door that will not latch has lost the line between its bolt and its strike plate. The bolt no longer lands in the hole cut for it. Either the door moved or the plate did, and the repair depends on which.
This guide shows how to find the contact point and tell a plate problem from a sagging door. It also covers weatherstripping, seasonal swelling and cost. It ends with what a visit can and cannot settle.
Why will my door not latch?
Because the bolt no longer lines up with the hole in the strike plate. The bolt is the spring loaded tongue in the door edge. The strike plate is the metal piece on the jamb that receives it.
Four things usually throw that line off. A plate may have shifted, a door may have sagged, a seal may be too thick, or a latch may have worn. Seasonal swelling does the same thing for a few months.
How do I find where the bolt is hitting?
Mark it. Schlage's latch troubleshooting steps start with a simple test. Rub chalk or lipstick on the end of the bolt, then lock and unlock the door several times.
The smear left on the strike plate shows where the bolt lands. Schlage notes that a bolt usually rubs on just one or two sides of the strike. A smear on the top edge means the bolt rides too high.
Is the strike plate the problem?
Often, yes. Allegion, which owns Schlage, lists a misaligned strike plate first in its latch repair article. The fix is to loosen the screws, shift the plate and retighten.
For a small miss, file the hole larger toward the smear. For a bigger miss, move the plate and cut a new recess. Fill the old screw holes with glued wood slivers first so the screws bite again.
The pocket behind the plate matters too. Schlage says the bolt pocket should be 1 inch deep. A shallower pocket stops the bolt before it extends fully. Chisel it deeper where the bolt drags.
Is weatherstripping holding the door off the latch?
Possibly, especially if the trouble began after new seals went in. Schlage lists weatherstripping that is too thick as a cause. It can keep the bolt out of its pocket.
The Pacific Northwest National Laboratory's Building America guide describes the dollar bill test. Close a bill in the door and pull it. If it slides out easily, the seal is loose. A swollen threshold can also drag the door, as the guide to replacing a door threshold explains.
Has the door sagged on its hinges?
If the door must be lifted, pushed or pulled to lock, probably yes. Schlage says that points to worn or loose hinges, so the bolt strikes the bottom of the plate. Moving the plate treats the symptom only.
Check the hinge screws first. Tighten loose ones, and replace stripped ones with longer screws. Schlage also suggests firmer hinges or shims behind them. The guide to sticking door causes reads the gap around the frame.
Can the latch itself be worn out?
Yes, though less often than a shifted plate. Allegion lists loose screws on the latch, knob or lever, and a worn latch, after the strike plate. Tighten every screw before blaming the hardware.
Then test the latch with the door open. The bolt should snap fully out and back every time. If it hangs part way, the fault is inside the lock and no change to the frame will fix it.
Why does the door latch in winter but not in summer?
Wood swells with moisture. A door can grow tight against the strike in humid weather and shrink clear of it in dry weather. Schlage suggests waiting until the door fits poorly again before adjusting anything.
A door that never settles back, or has soft wood near the strike, is a different problem. Check the signs of a rotted door frame before moving any hardware or cutting any wood.
Is a door that will not latch a safety problem?
It is a security problem. A deadbolt that cannot extend fully is not doing the job it was fitted for. A latch that misses can also let a door drift open in wind, so it is worth fixing the same day.
Do not solve it with a lock that needs a key inside. The egress door rule in the International Code Council's residential code covers this. Egress doors must open without a key or special effort.
Which fix matches which cause?
Each cause has its own sign, and the sign points to the repair. The table matches them up. It also shows what moves the cost, since a plate adjustment and a jamb rebuild are different jobs.
| Cause | What it looks like | The usual fix | What moves the cost |
|---|---|---|---|
| Shifted strike plate | Chalk smear on one edge of the hole | Move the plate, enlarge the hole | How well the screws hold |
| Shallow bolt pocket | Bolt stops short of full throw | Chisel the pocket to 1 inch | Condition of the jamb |
| Thick weatherstripping | Latches when the seal is pulled back | Thinner strip or new position | Seal type and length |
| Sagging door | Must be lifted to lock | Tighten or replace hinges, shim | Hinge and frame condition |
| Worn latch | Bolt hangs partway with door open | Replace the latch | Hardware type |
| Rotted jamb | Soft wood at the strike | Repair or replace the jamb | How far the rot runs |
What does it cost to fix a door that will not latch?
A small adjustment starts at the $99 minimum service call, and handyman work runs $65 an hour. Jamb repair starts at $195, and a full jamb or frame starts at $449. A door past adjusting is covered in door repair or replacement.
| The work | Starting price | Wider market | What moves it |
|---|---|---|---|
| Minimum service call | $99 minimum | $120 to $200 typical | Time on site |
| Handyman hourly rate | $65 per hour | $60 to $125 per hour | Access and task |
| Door jamb repair | From $195 | $200 to $600 | How much of the jamb is soft |
| Full jamb or frame replacement | From $449 | $500 to $1,200 | Door size and rot spread |
What cannot be determined from the doorway?
Whether the jamb is sound behind the plate. Soft wood near the strike hides under paint. A screwdriver tip often shows it, but rot inside the wall appears only when the trim comes off.
Whether the lock is worn or only dirty, and how far the house has settled. A latch can drag for years before it fails, and a settled opening can look like a swollen door. Bench testing and a second visit settle both.
Door will not latch questions
Why won't my door latch?
The bolt no longer lines up with the hole in the strike plate. The plate may have shifted, the door may have sagged, or the weatherstripping may be too thick. A worn latch or a swollen door can do it too. A chalk mark on the bolt shows where it misses.
How does Perfect Work diagnose a door that will not latch?
Perfect Work Remodeling & Repairs starts with chalk on the bolt to see where it lands on the plate. It then checks the hinge screws, the pocket depth and the weatherstripping. The latch is tested with the door open, and the cause is named before any part is moved.
Why does my door only latch when I lift it?
The door has sagged on its hinges, so the bolt hits the bottom of the strike plate. Tighten the hinge screws and replace stripped ones with longer screws that reach the framing. Shims behind a hinge can lift the door. Moving the plate alone only hides the sag.
What does a door latch repair from Perfect Work include?
A visit from Perfect Work Remodeling & Repairs covers the diagnosis, the fix and a latch test. The minimum service call starts at $99 and handyman time is $65 an hour. Jamb or rot work is priced separately, with the scope named before work starts.
Is it safe to leave a door that will not latch?
Not for long. A deadbolt that cannot extend fully gives less security. An unlatched exterior door can also blow open. Throw the deadbolt as a short-term measure if it will go in. Do not add a lock that needs a key to open from inside.
A door that latches starts with the line
A door that will not latch is usually a small misalignment. The chalk smear shows which way it went. The plate, the hinges and the seal are the likely culprits, and each costs less than a new door.
A visit from Perfect Work Remodeling & Repairs starts with the chalk test. The hinges, the pocket and the weatherstripping are checked next, then the latch itself. Door repair is part of its home repair services.
Call Perfect Work at 630-297-7888 · Book a door check