Rekey or Replace Your Locks? How to Decide

When keys go missing or you move into a new place, you have two ways to make the old keys useless: rekey the lock you have, or replace it with a new one. Both work. The right choice depends on the condition of your lock and what you want from it.

What rekeying does

Inside most locks is a set of small pins that line up when the right key is inserted. Rekeying swaps those pins for a new set, so a new key works and every old key stops working. The lock itself stays on your door.

Rekeying is usually the faster and more affordable option, because you're paying for labor and new keys, not new hardware.

When rekeying makes sense

• Your locks are in good working condition
• You just moved in and want to control who has keys
• A key was lost or stolen
• You want several locks to work with one key, and they share a compatible keyway

When replacing makes sense

• The lock is worn, sticking or damaged
• It's a low-quality lock you don't trust
• You want to upgrade to a high-security cylinder like Medeco or Mul-T-Lock
• You want a smart or keypad lock
• The lock was damaged in a break-in

What about high-security locks?

Standard keys can be copied at almost any hardware store. High-security cylinders use restricted keyways, so copies can only be made through an authorized locksmith with proper authorization. If keys have gone missing more than once, or many people pass through your door, replacing with high-security is worth considering.

The bottom line

If your lock works well, rekey it. If it's worn, cheap or you want better security, replace it. A good locksmith will tell you which one you actually need instead of selling you the most expensive option.