Key takeaways
- Rekey = same lock, new key. Old keys stop working. Cheaper and faster.
- Replace = new hardware. Needed when a lock is damaged, worn, or you're upgrading.
- Just moved in? Rekey or replace every exterior lock on day one.
- Lost a key or had too many copies made? Rekeying is usually all you need.
- Keying multiple locks to one key is easy to do while you're already paying for the visit.
Rekey or replace? The 10-second answer
Rekey when the lock works and you only need to stop old keys from opening it; replace when the lock is damaged, badly worn, or you want a higher security grade or a different style.
- Rekey — the hardware is fine, you just want new keys and the old ones to stop working.
- Replace — the lock is damaged, worn, outdated, or you're upgrading security or looks.
What rekeying actually does
Rekeying changes the pins inside your existing lock so a new key works and every old key stops working — same lock body, new key.
Because the locksmith reuses your existing hardware, rekeying is faster and cheaper than swapping the whole lock, and your doors look exactly the same afterward.
When rekeying is the right call
- You just moved in and the locks are in good shape.
- You lost a key and want the old one to stop working.
- Too many copies are floating around (old roommates, contractors, exes).
- You want every exterior door on a single key.
When you should replace instead
Replace the lock when the hardware itself is the problem — it's damaged, worn out, or no longer meets the security or style you want.
- The lock sticks, is hard to turn, or is visibly damaged.
- It's old and worn after years of daily use.
- You're upgrading to a deadbolt, smart lock, or higher security grade.
- The existing hardware is mismatched or dated.
- A break-in attempt damaged the lock or door.
Need a locksmith right now?
Cheetah Locksmith covers all of Miami. Fast, licensed, upfront pricing.
Cost: rekey vs. replace
Rekeying is typically cheaper per lock than replacing, because you're paying for labor only — replacement adds the cost of the new hardware on top.
If you have several doors, ask to have them all keyed alike during the same visit — it's usually inexpensive to add once the locksmith is already there, and it means one key for the whole house.
Moving into a new place? Do this.
When you move in, you have no idea how many keys are out there or who holds them — so rekey or replace every exterior lock in the first week.
Previous owners, their relatives, agents, cleaners, and contractors may all have had keys. Rekeying is usually enough; replace any lock that's already damaged or that you want to upgrade.
Frequently asked questions
Is rekeying as secure as replacing the lock?
If the lock is in good condition, yes — rekeying makes every old key useless and is just as secure as a new lock of the same grade. Replace only when the hardware itself is worn, damaged, or you want a higher security level.
Can I rekey all my locks to one key?
Yes, as long as the locks are the same brand or keyway. "Keying alike" is a common request and is usually inexpensive to add while the locksmith is already on site.
How long does rekeying take?
A single lock is usually quick. A typical home with several exterior doors is often handled in one visit.
Can I rekey a lock myself?
Rekey kits exist for some brands, but they're brand-specific and easy to get wrong. A locksmith does it quickly, keys multiple locks alike, and makes sure every old key is dead.
Should I rekey or replace after a break-in?
If the lock and door are undamaged, rekeying restores security. If the attempt damaged the lock, frame, or door, replace the affected hardware and have the rest rekeyed.
The Cheetah Locksmith Team
Licensed & Insured Miami Locksmiths
Cheetah Locksmith is a licensed, insured mobile locksmith team serving Miami-Dade. We handle emergency lockouts, car keys, rekeys, and lock installations across the city every week — using methods designed to avoid damage to your doors and locks whenever possible.
Related services
Lock Rekeying Service
Moving into a new home? Had a break-in? Rekeying your locks is a cost-effective way to ensure only you have keys. We rekey all types of residential and commercial locks quickly and affordably.
Residential Lock Services
Your home is your sanctuary. We provide complete residential locksmith services including new lock installation, lock rekeying, deadbolt upgrades, and smart lock installation to keep your family safe.