You’ve just moved into a new home. Or you’ve lost a set of keys. Or perhaps there’s been a break-in, or a housemate has moved out and you’re not sure who still has a key. Whatever the reason, you’ve decided it’s time to improve your home’s security, and now you face a practical question: should you rekey your locks or replace them?
Both options stop old keys from working, and both can give you real peace of mind. But they suit different situations, and choosing the right one can save you money while keeping your home properly protected. This guide explains how each option works, when each makes sense, and how to decide.
What Does Rekeying a Lock Mean?
Rekeying is the process of changing the internal workings of an existing lock so that it works with a new key. Inside most pin-tumbler locks, a set of small pins must line up exactly when the correct key is inserted. A locksmith removes the lock cylinder, swaps those pins for a new arrangement and cuts new keys to match. The lock stays on your door, but your old keys will no longer turn it.
The process is generally quick and doesn’t require new hardware. It’s a popular way to regain control of who can enter your home without the cost of replacing every lock.
What Does Replacing a Lock Mean?
Replacing a lock means removing the existing lock completely and fitting a new one in its place. The new lock comes with its own keys, and the old keys are rendered useless. Replacement also gives you the chance to choose a different type of lock, whether that’s a stronger deadbolt, a more convenient keyless model or simply a newer version of the same style.
Replacement involves new hardware, so the price depends partly on the lock you choose. It’s the right answer when the existing lock has a problem that rekeying can’t fix.
When Rekeying Is the Better Choice
Rekeying makes good sense when your existing locks are in good condition and your main concern is who holds the keys. Common situations include:
- You’ve just moved in. You can’t know how many copies of the old keys exist or who has them. Rekeying is a fast, sensible way to start with a clean slate, particularly for second-hand homes, rentals and recent purchases.
- You’ve lost a key. If your lock still works well, rekeying shuts out the lost key without the expense of a whole new lock.
- A former tenant, housemate, partner or contractor still has a key. Rekeying lets you take back control without any awkward conversations.
- You want all doors to use one key. A locksmith can rekey several locks so a single key opens your front door, back door and side entry, which is far more convenient than carrying a bunch of keys.
- You want to save money. When several locks are in good condition, rekeying is usually the more economical way to improve security.
When Replacing Is the Better Choice
Replacement is the better option when the lock itself is the problem, or when you want something better than what you have. Consider replacing in these cases:
- The lock is old, worn or damaged. A lock that sticks, jams, feels loose or is hard to turn is reaching the end of its life. Rekeying a worn lock won’t fix its problems.
- There’s been a break-in or attempted break-in. If the lock or the door has been tampered with, a replacement ensures you’re not relying on damaged hardware.
- You want better security. Moving from a basic lock to a quality deadbolt or a high-security cylinder can significantly strengthen your front door.
- You want keyless or smart entry. A keypad or smart lock requires new hardware, which means replacement rather than rekeying.
- The lock doesn’t meet your insurer’s expectations. Some insurance policies expect certain types of locks on external doors. It’s worth checking your policy and upgrading if needed.
- Your locks don’t match. If your home has a mix of old and mismatched locks, replacing them gives you a consistent, reliable set.
Comparing Rekeying and Replacing at a Glance
| Factor | Rekeying | Replacing |
|---|---|---|
| Cost | Generally lower | Depends on the new lock chosen |
| Time | Usually very quick | Slightly longer |
| Best for | New homes, lost keys, changed circumstances | Worn, damaged or outdated locks |
| Security upgrade | Keeps the same lock quality | Lets you upgrade the lock |
| Hardware | Existing lock stays | New lock installed |
Thinking About Cost
Rekeying is typically the more affordable option, especially when you have several locks in good condition. You’re paying mainly for the locksmith’s time and new keys, not for new hardware. Replacement costs more because it includes the price of the lock itself, which can range from a basic model to an advanced smart lock.
That said, the cheapest option isn’t always the best value. Rekeying a lock that’s about to fail only delays the cost of replacing it. A good locksmith will tell you honestly which option suits your situation, rather than pushing the more expensive choice.
Thinking About Security
Both options remove the risk posed by old keys. The difference is in the quality of the lock you’re left with.
If your existing lock is a solid, well-made unit in good condition, rekeying leaves you with a lock that’s just as secure as before. If your lock is a basic, low-quality or aging model, rekeying won’t make it any harder to defeat. In that case, replacement gives you a real upgrade and better protection for the same visit.
It’s also worth thinking about the door and frame. A strong lock can only protect you as well as the door it’s fitted to. If the frame is cracked or the door is flimsy, a locksmith can advise whether reinforcement is worthwhile.
Special Situations to Consider
Renters
If you rent, check your lease and speak with your landlord or property manager before changing any locks. Rules about who may alter locks and who must hold copies of the keys vary, so it’s important to get permission and agree on a plan.
After a Break-In
If someone has entered your home, it’s wise to inspect the lock and the door carefully. Damage isn’t always obvious. A locksmith can check whether the lock is still sound, and replace it if there’s any doubt.
After a Relationship Breakdown or Housemate Change
When someone who has a key no longer lives with you, rekeying or replacing the lock is a sensible step. It protects your belongings and your peace of mind without needing to rely on anyone returning their key.
New Builds and Renovations
Builders, tradespeople and agents often hold keys during construction. Rekeying once the work is done makes sure you’re the only one with access.
What to Expect on the Day
A locksmith will start by inspecting your existing locks to check their condition. For a rekey, the locksmith removes each cylinder, changes the pins, tests the new key and refits the lock, often in a short visit. For a replacement, they remove the old lock, fit the new one and test it to make sure it operates smoothly.
Before you finish, test every key and door. Make sure each lock turns easily, the door closes properly and you’ve received all the keys you need. If you want extra copies, ask while the locksmith is there.
A Simple Way to Decide
If you’re still unsure, ask yourself these questions:
- Is my current lock in good working condition? If yes, rekeying is likely enough.
- Is it worn, damaged or difficult to use? If yes, replace it.
- Do I want a stronger or more convenient lock? If yes, replace it.
- Is my main concern simply who holds the keys? If yes, rekeying is probably the answer.
- Does my insurer expect a particular lock type? If yes, check your policy and replace if needed.
Talk to Sunnybank Keylock
If you’re still not sure, you don’t have to decide alone. A locksmith can look at your locks, explain their condition and recommend the option that fits your home and budget. Contact Sunnybank Keylock for honest advice on whether rekeying or replacing is the right move for you.