When to Rekey vs Replace Your Locks

Rekey or Replace? Making the Right Choice for Your Locks

One of the most common questions we get is: “Should I rekey my locks or replace them?” Here’s a detailed guide to help you decide.

What Is Rekeying?

Rekeying changes the internal pin configuration of your existing lock so that old keys no longer work and new keys are created. The lock body, hardware, and finish stay the same — only the internal pins change.

What Is Lock Replacement?

Lock replacement removes the entire lock assembly and installs a new one — new hardware, new pins, new keys, and potentially a different finish or security grade.

When to Rekey

• Moving into a new home — You don’t know how many copies of the old key exist
• Roommate or tenant moves out — Revoke their access
• Lost keys — If you can’t account for all copies
• Divorce or break-up — Change access immediately
• Locks are in good condition — No need to replace working hardware
• Budget is a concern — Rekeying costs 50–70% less than replacement
• Want all locks on one key — “Keyed alike” rekeying uses one key for all doors

When to Replace

• Old, worn, or damaged locks — If the mechanism is stiff, loose, or unreliable
• After a burglary — Replace with higher-security hardware
• Upgrading security grade — Moving from Grade 3 to Grade 1 or 2
• Switching to smart locks — Complete hardware change needed
• Aesthetic update — New finish or style to match renovations
• Different lock brands on doors — Replacing standardizes to one brand/keyway

Cost Comparison

Our Recommendation

If your locks are in good condition and you just need to change access, rekey. If your locks are old, low-quality, or you want better security, replace. When in doubt, call S.A. Locksmith & Security at (210) 348-3677 — we’ll inspect your locks and give you honest advice.