Rekeying or changing locks: which option is best for your home?
You just moved into a new home. You lost a key. You recently separated. Or you are simply wondering whether your current locks are still secure. In all these situations, the same question comes up: should you rekey the lock or replace it completely?
What is rekeying?
Rekeying means changing the internal mechanism of an existing lock so it no longer works with the old key. A locksmith replaces the pins inside the cylinder and matches them to a new key.
Result: the old key becomes useless. Anyone who had a copy can no longer enter your home.
The lock itself stays in place - only the internal key mechanism changes.
What is a lock change?
A lock change means removing the existing lock hardware (cylinder, handle, deadbolt) and replacing it with a new one. You start fresh with brand-new hardware.
Result: your door is protected by a completely new system, independent from anything that existed before.
Rekeying vs lock replacement: direct comparison
| Criteria | Rekeying | Lock replacement |
|---|---|---|
| Cost | Lower | Higher |
| Service time | 15 to 30 minutes | 30 to 60 minutes |
| Lock hardware replaced | No | Yes |
| New key | Yes | Yes |
| Improves lock quality | No | Yes |
| Ideal when lock is in good condition | Yes | Not necessary |
| Ideal when lock is damaged | No | Yes |
When should you choose rekeying?
Rekeying is the fastest and most cost-effective option in many common situations.
1. You just bought or rented a home
You never know how many copies of your old keys are still out there - former tenants, neighbors, contractors, real estate agents. Rekeying gives you full control.
2. You lost a key
You may not need to replace all hardware. If the key is not linked to your address and the lock is in good condition, rekeying is usually enough.
3. You ended a relationship or changed roommate
A breakup, roommate departure, or revoking access for someone who previously had keys calls for immediate rekeying. It is faster and less expensive than full replacement.
4. You want one master key
If multiple doors use compatible locks, a locksmith can rekey them to work with a single key instead of carrying several.
5. Your lock is still in good condition
If your lock works well and shows no major wear, there may be no reason to replace it. Rekeying improves access control without unnecessary spending.
When should you replace the lock?
Some situations require complete lock replacement.
1. The lock is damaged or worn out
If it is hard to turn, keys stick, or the lock was forced during an attempted break-in, rekeying will not solve the root issue.
2. The existing lock is low quality
Many homes still use basic hardware-store locks with minimal resistance. This is a good time to upgrade to Grade 1 or high-security hardware.
3. You want to modernize security
If you want restricted-key systems, smart locks, or anti-pick certified models, you will need new lock hardware.
4. Your door was forced or burglarized
After a break-in, the lock may look fine but still be structurally compromised. Replacement is the safest option.
5. The lock is not rekey-compatible
Some very old, damaged, or uncommon locks cannot be rekeyed properly. A locksmith can confirm this on site.
How much does it cost? (South Shore, Brossard, Longueuil)
Pricing depends on lock type, number of cylinders, and door accessibility. In general:
- Rekeying: lower cost per cylinder, especially when multiple doors are done in one visit
- Lock replacement: higher cost, depending on the quality of the new hardware
In all cases, NT Security provides a clear estimate before work begins, with no hidden fees.
Can you rekey a lock yourself?
DIY rekey kits exist, but proper use requires specific tools and lock knowledge. Mistakes can damage the cylinder, cause key issues, or leave security gaps.
For reliable results and workmanship guarantee, a professional locksmith is usually the better option.
Frequently asked questions
Can every lock be rekeyed?
Most common residential locks can be rekeyed. Some very old, damaged, or unknown-brand models may need replacement.
How long does rekeying take?
Usually 15 to 30 minutes per cylinder. Doing multiple doors in one visit is often more economical.
If I rekey my lock, do I need new keys?
Yes. Rekeying creates a new key profile, so old keys will stop working.
What is the difference between rekeying and key duplication?
Key duplication copies an existing key without changing the lock. Rekeying changes the lock so only a new key works.
Does NT Security provide on-site rekeying?
Yes. NT Security provides residential rekeying in Brossard, Longueuil, La Prairie, Boucherville, Saint-Lambert, Candiac, Chateauguay, and across the South Shore.
Still unsure which option is right for you?
That is normal - every property is different. A certified locksmith can assess your current locks, explain your options, and recommend the safest, most cost-effective plan.
Contact NT Security today for a free quote. Service available in Brossard and across the South Shore.