Should You Rekey or Replace Your Locks?

When keys are lost, staff leave, tenants change or a lock begins causing trouble, the first question is often whether the lock should be rekeyed or replaced. Both options can restore control, but they solve different problems.

Rekeying changes which key operates an existing lock. Replacing changes the lock hardware itself. The right choice depends on the condition of the lock, the level of security required, the number of doors involved and whether the current hardware still suits the property.

What does rekeying a lock mean?

Rekeying changes the internal combination of a compatible lock cylinder so the old key no longer works. The lock remains on the door, but a new key operates it.

This is often a practical option when:

• The existing lock is in good condition
• You have moved into a home and cannot account for every old key
• Keys have been lost or not returned
• A tenant, employee or contractor no longer needs access
• You want compatible locks keyed alike
• You need a new key combination without replacing otherwise serviceable hardware

Rekeying is not simply cutting another copy of the same key. The lock is altered so previous keys are rejected.

What does replacing a lock mean?

Replacing a lock means removing some or all of the existing hardware and fitting a different lock, cylinder, deadbolt, digital lock or commercial locking product.

Replacement is more likely to be appropriate when:

• The lock is damaged, unreliable or badly worn
• The door or frame requires a different type of hardware
• The current lock provides inadequate security
• The lock cannot be economically repaired or rekeyed
• You want to change from mechanical keys to a suitable digital lock
• The existing lock is incompatible with a master key or restricted key system
• The appearance, function or accessibility of the hardware needs to change

Rekeying versus replacement at a glance

When rekeying is usually the better option

After moving into a new home

You may receive several keys at settlement, but you cannot know how many copies were made over the years. Previous owners, tenants, cleaners, tradespeople or family members may still have keys. If the locks are suitable and serviceable, rekeying can restore key control without replacing every lock.

After keys are lost or stolen

If a missing key can be connected to your address, the risk is greater. Rekeying the affected locks prevents the missing key from working. The decision should consider which doors the key opened and whether it was part of a broader key system.

When staff, tenants or contractors leave

Returned keys do not prove that no copies exist. Rekeying can be appropriate when access needs to be removed quickly. For businesses with frequent staff or contractor changes, a restricted key system may provide better long-term control.

When you want fewer keys

Compatible locks can sometimes be keyed alike so one key operates several doors. This is different from a master key system, where different users can have different access levels.

When replacement is usually the better option

The lock is worn or unreliable

Rekeying does not repair a cracked lock body, damaged latch, worn mechanism or unsuitable installation. If the hardware is at the end of its useful life, replacement may be more sensible.

The door needs a different type of security

A basic entrance set may not provide the function required for a particular external door. The correct replacement depends on the door construction, frame, usage and desired security.

You need a digital lock

A digital lock can improve convenience where codes, cards, fingerprints or app access suit the users. The door still needs appropriate mechanical preparation and reliable installation. See our digital and smart lock guidance.

The existing hardware is incompatible with the access plan

Commercial and strata properties may need cylinders that support a master key system or controlled duplication. Keeping incompatible hardware can create an untidy mixture of keys and access rules.

Can a lock be repaired instead?

Sometimes. A stiff or unreliable lock may be affected by door alignment, loose hardware, contamination, a damaged key or a failing internal component. Repair may be appropriate where the lock is otherwise suitable.

Avoid forcing a key that will not turn. Excessive force can break the key or damage the lock further. Suitable maintenance can help in some cases, but lubricant will not cure mechanical wear or a misaligned door. Read our guide to lubricating locks with INOX MX3.

How cost should influence the decision

Rekeying is often less expensive than replacing several good-quality locks, but price should not be the only consideration. A cheaper rekey is poor value if the lock is already failing. Likewise, replacing sound hardware may be unnecessary when a new key combination solves the real problem.

The total cost can be affected by:

• The number and type of locks
• Whether all locks are compatible
• The condition of doors and frames
• The number of new keys required
• Whether locks are to be keyed alike
• Whether restricted or master-keyed access is required
• Whether urgent or after-hours attendance is needed

Residential, rental and commercial considerations

Homeowners

Focus on external doors, garage access and any door connecting the garage to the home. Consider whether all previous keys are accounted for and whether the existing locks suit the doors.

Landlords and property managers

Key control should be reviewed between tenancies and after missing keys. Changes must also fit the property’s management procedures and applicable tenancy obligations. A locksmith can address the hardware, while legal or tenancy questions should be checked with the relevant professional or authority.

Businesses

Repeatedly rekeying individual doors may become inefficient when staff access is not documented. A commercial locksmith review can identify whether a keyed-alike, master-keyed or restricted system is more appropriate.

A practical decision process

1. Identify the reason for the change. Lost key, staff change, wear, poor security or convenience?
2. Check the condition of the hardware. Is it reliable, suitable and correctly installed?
3. Review who should have access. One household, several staff roles, contractors or common areas?
4. Consider future changes. Will more doors, staff or tenants be added?
5. Choose the simplest solution that properly addresses the risk.

Frequently asked questions

Is it cheaper to rekey or replace locks?

Rekeying is often less expensive when suitable locks are already installed, but replacement may be better value when hardware is worn, damaged or unsuitable.

Will old keys work after rekeying?

No. A properly rekeyed lock is changed so the old key no longer operates it.

Can all my locks use the same key?

Possibly, if the locks and cylinders are compatible. A locksmith can assess whether they can be keyed alike.

Should I rekey after moving house?

It is worth considering because you may not know how many copies of the old keys exist. The lock condition should be checked at the same time.

Should I replace locks after a break-in?

Damaged locks, doors and frames should be inspected. Replacement may be required, but the correct repair should address the entire door assembly rather than only the cylinder.

Can a digital lock replace my existing lock?

Sometimes. Compatibility depends on the door, existing preparation, backset, thickness and the selected digital lock.

Need help deciding?

Abetta Mobile Locksmith can inspect the locks, explain what can be retained and recommend whether repair, rekeying or replacement is the practical option for your Sunshine Coast property.

View our residential locksmith services, commercial locksmith services, or request an estimate.

Related knowledge

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• Restricted key systems explained
• How master key systems work
• Browse locksmith advice