Rekeying and replacing are two different solutions to the same problem — key control and lock security. Choosing the right one saves money and maximizes security.
WHAT IS REKEYING?
Rekeying changes the internal pin configuration of your existing lock cylinder so a new key operates it — and all old keys stop working. The lock hardware stays exactly in place. A locksmith removes the cylinder, replaces the internal pins with a different configuration, and hands you a new key. Cost: fraction of replacement. Time: 10–15 minutes per lock.
WHAT IS LOCK REPLACEMENT?
Lock replacement removes the entire hardware unit — deadbolt, knob, handles — and installs a brand-new one. Necessary when hardware is worn, damaged, or when upgrading to a higher security grade or a smart lock.
WHEN TO REKEY
- You just moved into a new or previously owned home
- A tenant moved out of your rental property
- You lost a key and want to invalidate it
- You want all your locks to work on one key (keying alike)
- Your hardware is in good mechanical condition
- You recently had a relationship change with someone who had a key
WHEN TO REPLACE
- The lock is stiff, worn, or mechanically damaged
- You want to upgrade from Grade 3 to Grade 1 security
- You're installing a smart or keypad lock
- After a break-in or forced entry attempt
- The lock is over 10–15 years old with heavy use
THE COST DIFFERENCE
Rekeying a home with 3–4 locks: approximately $100–150 all-in. Replacing those same locks with Grade 1 hardware: $300–600+ depending on brands. When hardware is solid, rekeying delivers the same security outcome for a fraction of the price.
PRO TIP: HIGH-SECURITY CYLINDER UPGRADE
A third option exists: replace only the cylinder inside your existing lock body with a Medeco or Mul-T-Lock high-security cylinder. You keep your existing hardware but gain pick resistance, drill resistance, and restricted key duplication. Best of both worlds for homeowners who like their current hardware but want better security.