Rekey vs. Replace: How to Tell Which Your Lock Needs
"Rekey" and "replace" get used interchangeably a lot, but they're two different jobs with two different price tags — and picking the wrong one either wastes money or leaves you less secure than you think you are.
What rekeying actually is
Rekeying means changing the internal pins inside your existing lock so your old keys stop working and new ones take over — the lock hardware itself stays exactly the same. It's fast, it's the cheaper option, and it's the right call any time the lock itself is in good shape but you don't trust who might have a copy of the key.
What replacing actually is
Replacing means pulling the whole lock — cylinder, housing, everything — and putting in a new one. You'd do this when the hardware itself is the problem: it's worn out, damaged, outdated, or you want to upgrade to something the old lock can't become, like a smart lock.
- Lost your keys but the lock still turns smooth and looks fine? Rekey it. No reason to spend more than you have to.
- Just moved into a new place and don't know who's had copies of the old keys over the years? Rekey it at minimum — even if the lock looks fine, you have no idea who's out there with a working key.
- Deadbolt's 10+ years old, sticky, or already showing wear? I'd tell you to replace it instead. Rekeying a lock that's already on its way out just delays the inevitable.
- Want a smart lock? That's a replace, not a rekey — smart locks are different hardware entirely. (And since they live on your WiFi, it's worth checking whether your network reaches that door before you buy one.)
- Any sign of forced entry or pry damage, even minor? Replace it. Don't rekey a lock that's already been compromised.
The cost difference
Around Zephyrhills and Pasco County, rekeys typically run $40–$70. A standard lock replacement runs closer to $50–$90 depending on the hardware. If you're on the fence, it's worth asking — as a locksmith, I'll always tell you honestly which one your situation actually calls for instead of just upselling the bigger job.
Rekey vs. Replace at a Glance
| Rekey | Full Replace | |
|---|---|---|
| Typical Cost | $40–$70 | $50–$90 |
| Time On-Site | ~20–30 min | ~30–45 min |
| What Changes | Internal pins only — same hardware | Entire lock: cylinder and housing |
| Best For | Lost keys, or you don't know who has copies — lock is still solid | Worn, damaged, or outdated hardware, or you want a smart lock |
| Skip This If | Lock shows wear, sticking, or forced-entry damage | Budget's tight and the current lock is solid with known key control |
FAQ
Can I rekey a lock myself?
Possible with a rekey kit on a standard pin-tumbler lock, but it's easy to get the pin order wrong and end up locked out mid-job, especially on a lock you've never taken apart before. Weigh that risk against the $40-$70 a professional rekey actually costs — for most people, it's a lot of trial and error to save under $50.
Does rekeying work on any lock?
No — it works on standard pin-tumbler cylinders, which covers most residential deadbolts and knob locks you'll find at a hardware store. Smart locks, keyed-alike systems, and some high-security cylinders don't rekey the same way, so those usually call for a replace instead.
How long does a rekey actually take?
Most single-lock rekeys run 20-30 minutes on-site once I'm there and have the right pins on hand. Multiple locks on the same visit go faster per-lock since I'm already set up and don't have to pack tools back up between doors.
What if I don't know how many keys are out there?
That's actually one of the most common reasons people rekey — moving into a new place, ending a relationship, or just losing track of who's had a spare over the years. If you can't say with certainty how many keys exist, rekeying (or replacing, if the lock's also worn) is the safer call regardless of whether anything's actually happened.
- Does the lock still turn smoothly, with no grinding or sticking?
- Do you know for certain how many keys exist and who has them?
- Any sign of forced entry or pry damage, even minor?
"No" to any of these? Lean toward replace, not rekey.
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