When you've lost a key, moved into a new home, or want to change who has access to your property, two main options come up: rekeying or replacing your locks entirely. Understanding the real costs and practical differences between these approaches will help you make the decision that fits your budget and security needs.
What's the Difference?
Rekeying involves changing the internal pins of your lock mechanism so that old keys no longer work, but the lock hardware itself stays in place. A locksmith removes the cylinder, adjusts the tumblers, and recodes it to work with a new key. Replacement means removing the entire lock unit and installing a brand-new one, which may include an upgraded mechanism or a completely different locking system.
The choice between them hinges on three factors: your current lock's condition, how much you want to upgrade, and your immediate budget.
Cost Breakdown
Rekeying costs typically range from $15 to $40 per lock when a locksmith handles it. For a three-bedroom home with locks on the front door, back door, and garage entry, expect $45 to $120 total in labor. This assumes your existing locks are in working condition and the pins haven't been damaged or worn down.
Lock replacement costs start around $30 to $100 per lock for standard residential deadbolts and knobs, plus installation fees of $50 to $150 per lock depending on your area and locksmith rates. A full home upgrade—say, installing keyed entry on five doors with mid-range deadbolts—can run $400 to $800 total.
The math is straightforward: rekeying saves money upfront, but only if your hardware is sound.
When Rekeying Makes Sense
Rekeying is your best option if:
- You've just moved into a rental or purchased a home and want to ensure previous occupants don't have keys
- You've lost a single key and want to prevent anyone who found it from entering
- Your locks are less than 10 years old and still operate smoothly
- You're renting and your landlord covers the cost
- You want all your doors keyed to a single master key (popular in rental properties and multi-door homes)
A typical rekeying appointment takes 15 to 30 minutes per lock. Many locksmiths can rekey 3 to 4 locks in one visit, so you're looking at a single service call rather than multiple trips.
When Replacement Is Worth It
Go for replacement locks if:
- Your existing locks are damaged, rusted, or difficult to turn
- You want to upgrade to smart locks, keypad entry, or higher-security cylinders
- The lock has been forced or tampered with
- You're installing a unified security system across your home
- You want better insurance coverage or are moving into a high-risk area where insurance recommends deadbolts above a certain grade
Replacement lets you choose lock grade—standard (residential), medium commercial, or high-security—which impacts both security and cost.
Hidden Costs to Watch
Don't assume the locksmith quote covers everything. Ask whether the estimate includes:
- Removal of the old lock (sometimes charged separately)
- Installation of new hardware if you're replacing
- Rekeying to match existing keys across multiple locks
- Emergency or after-hours fees (often 50% to 100% higher)
- Travel charges (common in rural areas)
A $20 rekey quote can jump to $65 if the locksmith encounters a corroded cylinder or needs a service call outside standard hours.
DIY vs. Professional Service
Rekeying is nearly impossible to do yourself without specialized pin kits and knowledge of your specific lock model. Replacement of basic knobs is more DIY-friendly, but deadbolts require precise drilling and alignment. Most homeowners save time and avoid mistakes by hiring a professional. Professional work typically comes with a service guarantee—rekeying or replacement done wrong can lock you out or compromise security.
Getting Quotes and Comparing Providers
Contact 2 to 3 locksmiths in your area and request written estimates that break down labor and parts. Clarify whether they're quoting rekeying or replacement. Check that they're licensed and insured; residential locksmiths should carry liability coverage. You can use Mercoly to compare and find trusted residential locksmiths providers in one place, making it easier to review credentials and customer feedback side by side.
Ask each locksmith how long they've been in business and whether they offer warranties on their work.
Frequently Asked Questions
Q: If I rekey my lock, can I use my old key with any other lock? No—rekeying changes only the specific lock cylinder you paid for. Each lock would need separate rekeying to match a single key.
Q: Is rekeying more secure than the original key-cut? Rekeying provides the same security level as the original lock; it simply invalidates old keys. If you want better security, upgrading to a higher-grade lock or smart lock is more effective.
Q: How long does a rekey typically last? A professional rekey lasts indefinitely if the lock mechanism remains in good condition, usually 5 to 15+ years depending on use and weather exposure.
Contact a licensed residential locksmith near you today to get a binding estimate for your specific locks.