When it comes to securing your home or business, your locks are the first line of defense. But what happens when you lose a key, move into a new place, or feel your security has been compromised? You’re left with two choices: rekeying or changing your locks.
At first glance, these might seem like the same thing — but they’re not. Understanding the difference can save you time, money, and keep your property secure.
In this guide, we’ll explain:
- What rekeying is (and how it works)
- What changing locks involves
- The pros and cons of each
- When to choose one over the other
- Average costs in Australia
- Expert locksmith recommendations
What Is Rekeying?
Rekeying a lock means changing the internal pins (called tumblers) inside the lock cylinder so the old key no longer works. A new key is then cut to match the updated configuration.
You keep the same lock hardware — just with a new key.
Best for:
- Lost or stolen keys
- Moving into a new home
- Tenants moving out
- After a break-up or change in staff (for businesses)
Pro Tip:
Rekeying can be done on most standard locks, deadbolts, and even some padlocks, as long as the lock is in good condition.
What Is Changing Locks?
Changing your locks involves removing the entire lock (including the cylinder and hardware) and replacing it with a brand-new one.
You’ll receive new keys — and potentially upgrade your security in the process.
Best for:
- Damaged or worn-out locks
- Upgrading to a high-security or digital lock
- Installing locks that match a new style or door
- When the existing lock can’t be rekeyed
Pros & Cons Comparison
| Feature | Rekeying | Changing Locks |
|---|---|---|
| Cost | More affordable | More expensive |
| Security | Removes old key access | Allows for hardware upgrade |
| Time | Quicker (often same-day) | Slightly longer install |
| Customization | Limited to existing lock | Full range of new options |
| Key Control | Restores control over access | Starts fresh with new lock and key |
Cost Comparison in Australia
Rekeying:
Rekeying a lock typically costs 60–80% less than replacing the entire lock. It’s one of the most affordable ways to secure your home, especially if your existing hardware is in good condition. If you rekey multiple locks to the same key, you can save even more on service fees.
Changing Locks:
Changing your locks can cost up to 4x more than rekeying, depending on the type of lock and materials used. This includes labour and new hardware. High-security or smart locks will push the price higher, but offer additional security and convenience.
Tip: In most cases, rekeying is the cheaper option — but not always the best one.
When Should You Rekey?
Here are some common scenarios where rekeying is the smart choice:
- You just moved into a new house. You never know who might have a spare key — old tenants, contractors, cleaners.
- You lost your keys or had them stolen.
- You want to match multiple locks to a single key — this can often be done through rekeying.
- There’s been a security concern, such as an ex-roommate or disgruntled employee.
If the lock is in good condition, rekeying is fast, discreet, and affordable.
When Should You Change Your Locks?
Changing your locks might be the better option when:
- Your current lock is broken or worn.
- You want to upgrade to a digital or smart lock.
- You’re dealing with a non-standard or specialty lock that can’t be rekeyed.
- You want to increase your home’s value or curb appeal with modern fixtures.
Some people also simply feel better knowing everything — hardware and key — is completely new.
What Most People Get Wrong
A common myth is that rekeying is “less secure.” That’s false — rekeying is just as effective at denying access to old keys. What matters is the quality of the existing lock.
If you have a high-quality deadbolt and it’s still in great shape, rekeying can restore full control without replacing the entire mechanism.
But if you have a cheap or degraded lock, you’re better off changing it altogether.
Expert Locksmith Advice
A professional locksmith can help you assess:
- Whether your current lock can be rekeyed
- If your lock is compatible with master key systems
- Whether upgrading to a digital or restricted key system is worth it
- The most cost-effective option for your specific property
Contact us today — we’re fully licensed, insured, and experienced in both residential and commercial locksmith services.
Avoid DIY rekeying kits unless you really know what you’re doing — it’s easy to mess up the pin alignment, which can jam your lock.
Final Verdict: Rekey or Replace?
Rekeying is ideal when:
- Your lock is still in good condition
- You need a fast, budget-friendly solution
- You want to control access to your property
Changing locks is ideal when:
- Your locks are outdated, broken, or low-quality
- You want to upgrade your security
- You prefer starting fresh with modern hardware
Still unsure? Contact your local locksmith for a professional assessment — they’ll help you find the safest, smartest option for your needs.
Need Help Choosing?
If you’re located in Shellharbour / Wollongong / Illawarra, our friendly team at Shellharbour Locksmiths can help with both rekeying and full lock replacement. We’re fully licensed, mobile, and ready 24/7.
Need a Locksmith?
Contact us today for fast, reliable service from a trusted local team.