Reviewed by Emergency Locksmith NY|Published: | Updated:
Understanding the Difference
When you need to change who has access to your home or business, you have two options: rekeying the existing locks or replacing them entirely. Both accomplish the same basic goal -- the old keys stop working -- but they differ in cost, time, and the level of security upgrade you get.
Rekeying means changing the internal pin configuration of your existing lock so that a new key operates it. The lock body, handle, and exterior appearance stay the same. Only the pins and springs inside the cylinder are changed. Learn more about the rekeying process.
Replacing means removing the entire lock -- cylinder, body, handle, everything -- and installing new hardware. The old key will not work because the old lock is gone.
When Rekeying Makes Sense
Moving into a new apartment: You have no idea how many copies of the old key exist. Rekeying immediately after moving in is one of the smartest security steps you can take.
After a roommate moves out: Rather than trusting that all keys were returned, rekeying ensures their keys no longer work
Lost keys: If you have lost your keys but the lock itself is in good condition, rekeying is the most cost-effective solution
Budget is a concern: Rekeying typically costs $50 to $150 per lock, compared to $100 to $300+ for a full replacement
You like your current hardware: If you have high-quality locks that work well, there is no reason to replace them just to change access
When Replacement Is the Better Choice
Old or worn locks: If the lock is stiff, hard to turn, or showing its age, replacement gives you both new access control and better function
Upgrading security: If you currently have basic locks and want to move to high-security options like Medeco or Mul-T-Lock, replacement is the only path
After a break-in or attempted break-in: Damaged locks should be replaced, not rekeyed. A full lock change ensures the mechanism is undamaged
Switching to smart locks: If you want smart lock features like keypad entry, remote access, or activity logs, you need new hardware
Matching multiple doors: When adding new locks to a home or business, it is often easier to install matching hardware throughout rather than trying to rekey mismatched locks to work with one key
Cost Comparison
For a typical NYC apartment with one deadbolt and one knob lock on the main door:
Rekeying both: Typically $100 to $250 total, depending on lock brand and complexity
Replacing both with standard locks: Typically $200 to $450 total, including hardware and labor
Replacing both with high-security locks: Typically $350 to $700 total, depending on the brand and features
If you have multiple locks to address, ask your locksmith about package pricing. Many locksmiths offer a per-lock discount when rekeying or replacing several locks at once.
The Bottom Line
If your locks are in good condition and you just need to change who has access, rekeying saves money while fully solving the problem. If your locks are old, damaged, or you want a genuine security upgrade, replacement is the investment worth making. A licensed locksmith can inspect your current locks and recommend the best option for your specific situation.
Lock Change & Rekey Services
Ready to rekey or replace your locks? Our licensed locksmiths help you choose the right option for your situation.
Most standard pin-tumbler locks can be rekeyed. Some electronic locks, very old antique locks, and certain specialty locks may not be rekeyable. A locksmith can tell you on inspection whether your specific lock supports rekeying.
How long does rekeying take compared to replacing?
Rekeying a single lock typically takes 10 to 20 minutes. A full lock replacement takes 20 to 45 minutes per lock, depending on the hardware and whether the door needs any modification for the new lock.
Can I rekey different brand locks to use the same key?
Not usually. Rekeying works within a brand's pin system. To get multiple different-brand locks working with one key, you would typically need to replace them all with the same brand and have them keyed alike during installation.
