Rekey or Replace? How to Decide
Both change who can open a door. They are not the same job, and one is often clearly the better fit.
What rekeying changes
A standard door lock works by lining up a stack of spring-loaded pins at a shear line. Only the right key raises every pin to the correct height so the plug can turn. Rekeying replaces those pins with a set matched to a different key. The old key no longer lines the pins up, so it stops working, and a new key takes over.
The lock body, the bolt, and the outside trim all stay on the door. Nothing about the way the lock looks or mounts changes. That is why rekeying is usually the quicker and less disruptive option when it applies.
When rekeying is enough
- You just moved in and do not know who has copies.
- A key was lost, especially one with anything identifying on the tag.
- A tenant moved out or an employee left.
- You want several doors to open with one key and the locks share a keyway.
- A single door currently needs two or three different keys and you want one.
In all of these the hardware is fine. The problem is the key, and rekeying solves a key problem directly.
When replacement is the better call
- The lock binds, drags, or feels rough even with a correct key. That is wear or damage, and re-pinning it does not fix it.
- The finish is corroded or the lock is visibly old and loose in the door.
- The function is wrong: a bedroom-style privacy lock on an exterior door, or a keyed knob where a deadbolt belongs.
- The keyway is not one that can be pinned to match your other locks, so keyed-alike is impossible without a cylinder swap.
- You want features the current hardware does not have, such as a keypad or a smart deadbolt.
A quick way to think about it
If the lock still works smoothly and you only need different keys, rekey. If the lock itself is the problem, or you want something it cannot do, replace. When a door both sticks and has an unknown key history, the mechanical fault gets diagnosed first, because a fresh cylinder on a sagging door will still bind.
More detail on each path is on the lock rekeying and lock repair pages. To talk through a specific door, call (866) 306-9624.