Guide
Rekeying vs. Replacing Your Locks: Which Do You Need?
Rekey or replace? An Upper West Side locksmith explains the difference, the costs in effort, and when each is right.
Rekeying changes the lock's internal pins so old keys stop working; the hardware stays on the door. Replacing swaps the entire lock for new hardware. Rekeying is faster and less expensive, and it is the right answer whenever the existing hardware is in good condition — after a move, a roommate change, or a lost key.
Replacement is right when the hardware itself is the problem: a worn-out mechanism, a low-grade lock you do not trust, a style you want to upgrade, or damage from an attempted break-in. It is also the moment to step up to high-security cylinders or a smart deadbolt, since the labor overlaps.
One more scenario we see constantly on the Upper West Side: original mortise locks in pre-war doors. These are usually worth rekeying and servicing rather than replacing — the mechanisms are excellent, the doors are irreplaceable, and a good locksmith keeps them running for decades.
Frequently asked questions
I just moved in. Rekey or replace?
Rekey, unless the hardware is worn or untrustworthy. It invalidates every old key in circulation.
Can all my locks be keyed to one key?
Usually yes, when the locks share a compatible keyway — we do this on most rekeying visits.
How long does rekeying take?
Most apartments take under an hour for several locks.
Do you rekey mortise locks?
Yes — pre-war apartments across the neighborhood run on mortise hardware, and we rekey them routinely.