Moving into a new home is exciting, but there’s one security step many people overlook: making sure old keys no longer work on your doors. You have no way of knowing how many copies of the previous owner’s keys exist or who has them.
The two main options are rekeying and full lock replacement. Both solve the problem, but they work differently and fit different situations. Here’s how to decide which one makes sense for your new home.
Table of Contents
- What Rekeying Actually Means
- What Lock Replacement Actually Means
- Rekey vs Replace: Side-by-Side Comparison
- When Rekeying Makes More Sense
- When Replacement Makes More Sense
- Cost Differences to Expect
- What a Locksmith Checks Before Recommending Either Option
- Key Takeaways
- FAQs
What Rekeying Actually Means
Rekeying means changing the internal pins inside your existing lock cylinder so that old keys no longer open it, while a new key is cut to match the updated pin configuration. The lock hardware itself, including the handle, deadbolt body, and finish, stays exactly the same.
This is a popular option because it’s:
- Faster than full replacement
- Less expensive in most cases
- Ideal when your current locks are in good physical condition
- Simple to do across multiple doors at once, so every lock uses the same new key
What Lock Replacement Actually Means
Replacement means removing the entire lock mechanism and installing a brand-new unit. This is necessary when:
- The existing lock is damaged, worn, or outdated
- You want to upgrade to a smart lock or higher security grade
- The hardware style no longer matches your home’s look
- A previous break-in attempt damaged the lock or door frame
Full replacement gives you a completely fresh mechanism, not just new pins inside an old one.
Rekey vs Replace: Side-by-Side Comparison
| Factor | Rekeying | Replacement |
| Cost | Generally lower | Generally higher |
| Speed | Usually faster | Takes longer per door |
| Hardware condition needed | Good working order | Any condition |
| Style/upgrade options | None (same hardware) | Full choice of new styles |
| Smart lock upgrade | Not possible | Possible |
| Best for | Recently built or well-maintained locks | Old, damaged, or outdated locks |
When Rekeying Makes More Sense
Rekeying is usually the right call if:
- Your new home’s locks are recent and function smoothly
- You simply want peace of mind that old keys won’t work
- You’re on a tighter renovation budget right after moving
- You like the current door hardware and don’t want to change its look
Many new homeowners choose rekeying as a fast first step, then decide on upgrades later. A residential locksmith can rekey every exterior door in your home in a single visit, so you leave with one key for the whole house.
When Replacement Makes More Sense
Replacement is the better choice if:
- Locks are visibly worn, sticky, or hard to turn
- You want to upgrade to a smart lock with keypad or app access
- The strike plate or door frame shows signs of previous damage
- You’re renovating and want matching, updated hardware throughout
If your locks have been giving you trouble already, it may be worth reading our post on the 10 signs it’s time to replace your door locks before deciding.
Cost Differences to Expect
Rekeying is typically less expensive since it reuses existing hardware and mainly involves labor and new pins. Replacement costs more because it includes the price of new hardware plus installation. The exact difference depends on:
- How many doors need service
- The lock brand and security grade you choose
- Whether you’re adding smart lock features
- Current condition of your door frames
A locksmith can give you an accurate, upfront quote for your specific home after a quick inspection.
What a Locksmith Checks Before Recommending Either Option
A professional won’t just guess. Expect them to check:
- Lock condition — testing how smoothly the key turns and the bolt extends.
- Door alignment — checking whether the frame or strike plate is warped or damaged.
- Security grade — confirming whether your current locks meet a reasonable security standard for your neighborhood.
- Your goals — asking whether you want convenience upgrades like keyless entry.
This assessment ensures you’re not overpaying for replacement when rekeying would do the job, or underpaying for rekeying when your locks genuinely need to go.
Key Takeaways
- Rekeying changes the internal pins; replacement swaps the entire lock.
- Rekeying is faster and cheaper; replacement is better for old, damaged, or outdated hardware.
- New homeowners should always change access after moving in, since you can’t know who has old keys.
- A locksmith inspection helps you pick the right option instead of guessing.
Conclusion
There’s no universal right answer between rekeying and replacing locks. It comes down to the condition of your current hardware, your budget, and whether you want new features like smart locks. Either way, taking action soon after moving in is one of the smartest security decisions a new homeowner can make.
Frequently Asked Questions
Is rekeying as secure as replacing locks?
Yes, when done correctly. Rekeying changes the pins so old keys no longer work, giving you the same level of security as before, just with a fresh key that only you control.
Can all locks be rekeyed?
Most standard pin-tumbler locks can be rekeyed. However, very old, damaged, or low-quality locks sometimes aren’t good candidates and are better replaced entirely.
How long does rekeying take?
A typical home with several exterior doors can usually be rekeyed in under an hour, since it doesn’t require removing the entire lock mechanism.
Do I need to rekey if I already got new keys from the seller?
Yes. You can’t verify how many additional copies exist elsewhere, so rekeying or replacing is still recommended even if you received keys at closing.
Can I rekey my locks myself?
DIY rekeying kits exist, but professional rekeying ensures the pins are set correctly and all doors are keyed alike, saving you from carrying multiple keys.
What’s the benefit of having all locks keyed alike?
One key for every exterior door is more convenient and reduces the chance of grabbing the wrong key in a hurry.
Should I rekey or replace if I’m adding a smart lock?
If you want a smart lock, replacement is necessary since rekeying only works with your current physical lock body.
Call to Action
Not sure whether to rekey or replace your new home’s locks? Contact LocksmithShortHills.com for a fast, honest assessment and a clear price before any work begins.