When you move into a new place or lose a key, one question always comes up: is it cheaper to rekey or replace a lock? The short answer, rekeying is usually the more affordable option. But price isn’t the only factor. Let’s break down what really matters so you can make the right call for your home security.
Understanding Rekeying: What It Really Means?
Rekeying a lock means adjusting its internal pins and springs so that old keys no longer work. The lock itself stays the same; only the key changes. In my experience, this is the best choice when your hardware is still in good shape but you want to invalidate old keys like after a tenant moves out or when you’ve misplaced one.
Why choose rekeying?
Lower cost (you only pay for labor and small internal parts).
Quicker process (a locksmith can rekey several locks in under an hour).
You can match all locks to a single key for convenience.
If your lock still turns smoothly and looks decent, rekeying restores security without breaking the bank.
Replacing a Lock: When It’s the Smarter Choice
Sometimes, replacing is the better call. If your lock is rusted, malfunctioning, or outdated, rekeying won’t solve deeper mechanical issues.
I’ve replaced locks for homeowners who wanted to upgrade to keyless or smart locks, or simply refresh old, tarnished hardware.
Choose replacement when:
The lock is damaged or sticking.
You want a modern security upgrade.
The hardware finish is worn or outdated.
Yes, replacing costs more since it includes both labor and the price of new hardware, but it also improves reliability and curb appeal.
Rekey vs Replace: Cost Comparison
Labor, Parts, and Hardware Costs
Here’s how it usually breaks down:
Rekeying: $20–$50 per lock (mainly labor and rekey kit).
Replacing: $80–$200 per lock (includes new hardware and installation).
From what I’ve seen, rekeying can be 50–70% cheaper than replacement, especially when you have multiple locks that can be keyed alike.
However, if your old locks are worn out or mismatched, the savings might not justify keeping them.
Security, Convenience, and When to Choose Each Option
While cost is key, think long-term:
Security: A new lock can offer better protection, but rekeying restores safety quickly when needed.
Convenience: Rekeying allows all doors to open with one key, ideal for rental properties or new homeowners.
Peace of mind: Replacing offers full reset and modern aesthetics.
Personally, I rekey after tenant changes or lost keys, and replace only when upgrading to smart locks or when the hardware feels unreliable.
Expert Tips to Save Money on Lock Changes
DIY vs Hiring a Locksmith
If you’re handy, you can buy a rekeying kit for popular brands like Kwikset or Schlage for about $15–$30. But unless you’re confident, hiring a professional locksmith ensures proper alignment and smooth operation.
Pro tips:
Rekey all locks at once to avoid confusion.
Ask your locksmith for key-alike service, it’s often free.
When replacing, invest in high-quality deadbolts or smart locks with good warranties.
FAQs
Yes, if your locks work fine but you want new keys for security reasons.
Yes, but it requires patience and a compatible rekey kit.
Typically 50–70% less than replacement.
Absolutely, it’s the easiest way to ensure no old keys still work.
