Why does my door stick only in summer and work fine in winter?
A door sticks in summer because heat and humidity make the door and its frame swell or shift slightly. The latch and bolt then stop lining up with the openings in the frame. The lock feels seized, but the real problem is usually alignment, not the lock.
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In winter the air is drier, the wood or frame settles back, and everything lines up again. That is why the same lock can feel fine for months and then catch every July.
Why it happens
Wooden doors take on moisture from the air and expand. Frames move too, and a heavy door can sag a little on its hinges in hot, damp weather. A fraction of a millimetre is enough to push the bolt against the edge of its opening instead of sliding into it.
To you, that feels like a stiff key, a handle that will not turn all the way, or a deadbolt that only throws if you lean on the door. The lock mechanism may be working perfectly. It is being asked to do its job with the parts out of line.
Because it comes and goes with the weather, the pattern itself is a useful clue. A worn or failing lock tends to get worse steadily and does not recover when the season changes.
What you can check yourself
- Test the lock with the door openWhile you are inside and the door is open, turn the key or thumbturn and watch the bolt move. If it moves smoothly in the open air, the lock is probably healthy and the trouble is alignment.
- Look for rubbing marksShiny or scuffed patches on the edge of the door, the frame or around the bolt opening show where parts are touching. They point to where the door has swollen or dropped.
- Check the hinge screwsLoose hinge screws let a door sag, which makes a lock catch. Snug them gently with a hand tool; do not overtighten.
- Do not force itLeaning hard on a stuck door or key can bend a key, strain the latch or damage the frame. If it will not turn easily, stop and leave it.
When to call a locksmith
Call if the lock now will not turn at all, if you are shut outside, or if the door catches so badly that you worry about being stuck out when you leave. Call (866) 690-5848 and we arrange a visit from an independent locksmith. If a child or pet is shut inside, call 911 first. Do not force a door or window; that tends to add a repair bill and risks injury from broken glass.
On any lockout the locksmith asks for identification and proof that you are entitled to enter the home before opening anything. A driver's licence with the address, a lease, a utility bill, or a neighbour or manager who can confirm it will do. This check protects you, and it is why this page cannot be used as a how-to. The estimate is free, the locksmith gives you the price after looking at the lock, and work starts only once you agree it.
What the locksmith will do
- Confirm who you areIdentification and your right to enter the property are checked first, before any work on the door.
- Open the door without damage where possibleWherever the lock allows it, the door is opened without harming the lock, door or frame.
- Replace the lock or cylinder if neededIf the lock cannot be saved, the lock or cylinder is replaced after the price is agreed.
- Check the door and frameAfterwards the locksmith checks the door and frame, which is where a seasonal sticking problem usually shows itself.
- Cut a spare keyIf you want one, a spare key can be cut before the locksmith leaves.
Related questions
- Will a new lock stop my door sticking in summer?
- Not if the cause is swelling or a dropped door. A new lock sitting in the same misaligned door will feel the same. The locksmith can look at the lock, door and frame together and tell you which one needs attention.
- How can I tell if it is the lock or the door?
- If the key and bolt work smoothly with the door open but bind once it is closed, the cause is almost always alignment. If the lock is stiff even with the door open, the lock itself is the likelier cause.
- Will it fix itself when the weather cools?
- It often eases as humidity drops, but the underlying cause, such as loose hinges or a settled frame, usually stays. A sticking lock can also wear faster from being forced each summer.
- What if the door sticks and I am locked out?
- Do not push or force it. Call and a locksmith can be arranged; they will check your identification and entitlement to enter, open the door without damage wherever the lock allows, and agree the price with you first.
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