May 10, 2026 · 5 min read

Rekeying vs. Replacing Locks: Which Should You Choose?

Homeowners often ask whether they should rekey their locks or replace them entirely. Here's a straightforward way to decide.

One of the most common questions we get is 'should I rekey or replace my locks?' The honest answer is: it depends on the condition of the hardware and what you're trying to accomplish. Both options are legitimate. One is usually cheaper.

What rekeying actually does

Rekeying keeps your existing locks in place and changes the small pins inside so that a new key operates them and the old one does not. Nothing about the outside of the door changes. The hardware, screws, and strike plate all stay put.

This is what people usually want after moving into a new home or when someone leaves the household. You don't need new locks, you need the old key to stop working.

When replacement is the right call

  • The lock is visibly worn, loose, or hard to turn even with the correct key.
  • The lock was damaged in a break-in attempt.
  • You want a different style, finish, or type of lock (for example adding a deadbolt).
  • You're upgrading to a smart lock or high-security hardware.

Cost, briefly

Rekeying is almost always the less expensive of the two, because you're not paying for new hardware. The exact price depends on how many locks you have and whether they share a keyway. Replacement adds the cost of the locks themselves.

Security, briefly

A properly rekeyed lock is exactly as secure as it was before, with a new key. The pins inside are what decide whether a key works, so replacing them changes access without weakening anything.

A simple way to decide

  • If your locks work well and you just want new keys → rekey.
  • If a lock is damaged, worn, or you want to upgrade → replace.
  • If you're not sure → ask us. A ten-second look at your existing lock usually answers the question.

Need a locksmith today?

Call Same Day Locksmith or request service online. We travel to you in Crest Hill and nearby communities.

Service hours: 7:00 AM – 11:00 PM, every day. Illinois Locksmith License No. 191.000919.