A Common Question With a Simple Answer
After moving into a new home, losing a key, or ending a relationship with someone who had access to your property, the question comes up: should you rekey your locks or replace them entirely? Understanding the difference — and when each is appropriate — can save you money without compromising your security.
What Does Rekeying Mean?
Rekeying a lock means changing the internal pin configuration of the existing lock cylinder so that the old key no longer works. A locksmith does this by disassembling the cylinder and replacing the pins with a different set that corresponds to a new key. The lock hardware itself stays in place.
Result: Your door looks exactly the same, uses the same lock body, but now only opens with the new key.
What Does Replacing a Lock Mean?
Replacing a lock means removing the entire lock assembly — deadbolt, latch, strike plate, and all — and installing a brand new unit. This is a more involved process but gives you a completely fresh start with new hardware.
When to Rekey Your Locks
Rekeying is the right choice in most situations where the lock is still in good condition:
- Moving into a new home — you never know how many copies of the original key are floating around.
- Lost or stolen keys — neutralize any risk from missing keys immediately.
- After a breakup, divorce, or roommate change — revoke physical access quickly and affordably.
- Consolidating keys — a locksmith can rekey multiple locks to work with a single master key.
- Routine security refresh — good practice every few years as a general precaution.
When to Replace Your Locks
Replacement is the better option when the lock hardware itself is the issue:
- The lock is damaged or worn — sticking, difficulty turning, or visible wear are signs the mechanism is failing.
- After a break-in attempt — forced entry often damages the lock body and frame in ways that compromise future security.
- Upgrading security grade — if your current lock is a Grade 3 builder-grade unit, replacing it with a Grade 1 deadbolt is a worthwhile upgrade.
- Switching to a smart lock — adding electronic access requires new hardware.
- The lock is very old — older lock designs may lack anti-pick or anti-bump features found in modern cylinders.
Cost Comparison
| Rekeying | Replacing | |
|---|---|---|
| Typical cost per lock | $20–$50 (labor) | $50–$200+ (parts + labor) |
| Time required | 15–30 minutes | 30–60 minutes |
| Hardware stays | Yes | No |
| Security upgrade potential | Limited (same lock body) | High (new grade/features) |
A Quick Decision Framework
- Is the lock hardware functional and in good shape? → Rekey it.
- Is the lock damaged, very old, or low-grade? → Replace it.
- Do you want smart features? → Replace it.
- Just want to revoke key access? → Rekey it.
Can You DIY Either One?
Lock replacement is a manageable DIY project for most homeowners — most hardware stores carry the tools and locks needed, and standard door preps are consistent. Rekeying, however, requires a rekeying kit specific to your lock brand and a follower tool. It's doable but fiddly; for most people, the time saved by hiring a locksmith is worth the modest service fee.