In locksmith terms
Rekeying is the process of changing the internal pins of a lock cylinder so that the old key no longer operates it and a new, different key does. The lock body, the hardware, and the finish all stay in place. Only the small pin stack inside the cylinder is reset to match a new key, which means the lock keeps working exactly as before but answers to a different key.
Because rekeying reuses the existing hardware, it is faster and usually cheaper than swapping out locks. It is also how a locksmith makes several different locks open with one key, or keeps matched locks in sync after one of them is changed. We confirm the lock is a rekeyable type and in good condition before we do it.
In plain English
Rekeying means a locksmith changes the guts of your existing lock so your old keys stop working and a brand-new key takes over. The lock on your door looks and works the same; it just listens to a different key now.
It is the go-to fix when you do not know who still has a copy of your key. Instead of buying new locks, you keep the ones you have and simply retire every old key at once.
When to rekey instead of replacing the lock
Rekeying is the right call when the lock itself is fine and you only need to control who has a working key. Moving into a new home, losing a key, a tenant turning over, an ex-partner or former employee with a copy, or a contractor who had access are all classic reasons. As long as the hardware is sound, rekeying solves the security problem without the cost of new locks.
Replacing the lock makes more sense when the hardware is damaged, worn out, low quality, or when you want a different style, finish, or a higher-security upgrade. In those cases new hardware is the better investment.
Keying alike and master keying
Rekeying also lets a locksmith make different doors share one key, called keying alike, so a single key runs your front, back, and garage entry doors. For a business, a locksmith can set up master keying, where each employee key opens only certain doors while a master key opens everything. Both are done by carefully arranging the pins in each lock to a planned key system.
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