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It is the question we get asked most often, usually by somebody who has just moved house or just let a tenant go. The locks feel like a problem, so the instinct is to rip them out and start again. Nine times out of ten, that is not what the situation needs.
Inside every pin tumbler lock there is a stack of small pins cut to match one specific key. Rekeying means taking the cylinder apart and swapping those pins for a different set. The lock stays on the door. The finish stays the same. The old key stops working, permanently, and a new key takes its place.
It is quick work on a standard residential lock, and because you are only paying for labour and a handful of pins, it costs a fraction of new hardware.
If the lock is in good working order and the only thing wrong with it is who has a key, rekeying solves the whole problem.
That last one surprises people. Several locks can usually be rekeyed to a single key, provided they are the same brand and keyway. It removes the keyring shuffle at the front door without changing a single piece of hardware.
Rekeying assumes the lock is sound. If it is not, you are paying to repair something that has already told you it is finished. Replace the hardware when:
If your house was newly built or recently sold, the locks may still be on the builder's or the previous agent's key. That is not a defect — it is how construction keying works — but it does mean the number of people who could open your front door is larger than you would like. It is worth sorting in the first week rather than the first year.
The cheapest deadbolt on the shelf will lock your door. It will also give way to a determined kick, because the weak point is rarely the lock itself — it is the strike plate and the two short screws holding it into the door frame. If you only change one thing, change those screws for three-inch ones that reach the stud behind the frame. It costs almost nothing and it does more for your door than most upgrades.