Why Won't My Door Latch or Lock Properly?
A door that pops open right after you close it, or a deadbolt that won't turn, is almost always a millimeter-level alignment problem, and there's a simple test that shows you exactly where.
- DIY time
- 10–45 min
- Cost range
- $0–400
- Difficulty
- Easy
- Risk
- Moderate Risk
1
Before you start
Diagnose first, then act.
Fire-rated and exit doors need extra care
2
Decision matrix
Every likely cause, with its own real cost and time, not one blended guess for the whole repair.
| Cause | Approach | Cost | Time |
|---|---|---|---|
| Loose Hinge Screws | DIY | $0–5 | 10–15 min |
| Misaligned Strike Plate | DIY | $0–10 | 30–45 min |
| Sticking Latch or Debris in the Strike Plate | DIY | $0–5 | 10–15 min |
| Warped Door, Rotted Frame, or Significant Structural Settling | Professional | $150–400 | 30–90 min |
3
Causes
Tap a cause to open it. Only one stays open at a time, so it's easy to compare.
4 · FAQ
Frequently asked questions
-
Why does my door pop back open after I close it?
The latch is almost certainly missing the strike plate hole, usually from a sagging door (loose hinges) or a slightly misaligned strike plate. The lipstick test shows you exactly which one.
-
What is the lipstick test for a door latch?
Rub lipstick or chalk on the latch bolt, close the door gently without letting it fully latch, then check where the mark lands on the strike plate relative to the actual hole. This tells you precisely how and where it's misaligned.
-
Can tightening hinge screws really fix a latch problem?
Yes, in many cases. Loose hinges let the door sag just enough to misalign the latch, and simply tightening the screws (or using a longer screw in the top hinge) is often enough to restore proper alignment.
-
Is it normal for doors to need this kind of adjustment over time?
Yes. Houses settle and wood expands and contracts with the seasons, so it's a normal part of home maintenance rather than a sign something's gone wrong.
-
When should I stop trying to fix this myself?
If hinge tightening and strike plate adjustment don't resolve it, or you notice an uneven gap around the whole door frame, that points toward warping, rot, or structural settling worth having a professional assess.
-
Can I fix a deadbolt that won't turn the same way?
Yes, the same diagnostic approach applies to deadbolts, since they also rely on precise alignment with a strike plate. If the deadbolt sticks rather than misaligns, powdered graphite in the key slot is a simple first thing to try.
-
Why can even new houses have this problem?
It's tempting to assume latch problems are an old-house issue, but new construction settles too, especially in the first year or two as lumber dries out and the foundation adjusts. A door that latched perfectly at move-in and doesn't a year later is a very normal part of a house settling in, not a sign of a serious defect.
References
Still deciding
Two other questions worth answering
This guide covers whether you can do the job yourself. These cover the two questions that often come before and after it.
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