The Short Answer
Rekeying is the process of changing the internal pin configuration of a lock cylinder so that it works with a new key, while the old key no longer operates the lock. The lock hardware itself — the deadbolt, knob, or lever — remains in place.
How Does It Work?
Every pin-tumbler lock (the most common type) has a series of small spring-loaded pins inside the cylinder. When you insert the correct key, it lifts each pin to an exact height that allows the cylinder to rotate and the lock to open.
When a locksmith rekeys your lock, they remove the cylinder and replace those driver pins and key pins with a new set that corresponds to a different key bitting. The result: a lock that looks identical but only responds to your new key.
Rekeying vs. Lock Replacement
| Factor | Rekeying | Full Replacement |
|---|---|---|
| Cost | Lower (labor only) | Higher (parts + labor) |
| Speed | 15–30 min per cylinder | 30–60 min per door |
| Hardware | Existing lock stays in place | Entire lock set replaced |
| Security | Equal — new pins, new key | Equal or upgraded if new lock |
| Best For | Tenant turnover, lost keys | Worn or damaged hardware |
When Should You Rekey?
- Moving into a new home or rental property
- After a tenant moves out
- If keys have been lost or stolen
- After a break-in or security incident
- When a contractor or cleaner's access needs to be revoked
- When setting up a master key system for a multi-unit property
How Locksmiths Track Rekeying Digitally
Modern locksmith shops use key control software like LockCRM to record every bitting cut during a rekey job. This creates an audit trail of which locks exist at a site, what their current bitting is, and who holds which keys.
LockCRM's Bench Mode feature performs real-time KW1 pin stack calculations and checks for duplicate bittings across all locks at a site — a critical check when building or extending master key systems.