A lock often gives a warning before it fails. The key starts sticking, the door needs a hard shove to latch, or you realise too many people may still have a copy. Knowing when to replace locks helps you deal with a security issue before it becomes an urgent lockout, break-in risk or expensive after-hours problem.
For Canberra homes, rentals and businesses, the right answer is not always a full lock replacement. In many cases, rekeying provides the security reset you need without changing the hardware. In others, worn, damaged or outdated locks should be replaced promptly. The key is understanding what has changed, who may have access and whether the lock is still doing its job.
When to replace locks after moving in
Changing access should be one of the first jobs after taking possession of a home, rental property, office, warehouse or shop. Even if the previous owner or tenant hands over every key they have, there is no reliable way to know how many copies were made over the years.
Neighbours, cleaners, tradespeople, former employees, family members and previous occupants may all have had a key at some point. That does not mean anyone intends to misuse it. It simply means you do not have full control over access until the locks have been rekeyed or replaced.
If the existing locks are good quality and in sound condition, rekeying is usually the practical option. A locksmith changes the internal combination so old keys no longer work, then supplies new keys for the current occupants. If the locks are worn, mismatched, low quality or unsuitable for the door, replacing them may make better long-term sense.
For property managers and landlords, a consistent process after each tenancy change protects tenants and helps maintain clear key control. It is also worth recording who receives keys, remotes, fobs and restricted keys rather than relying on informal handovers.
Lost, stolen or unreturned keys
A missing key does not always mean you need new locks. If you are certain it was dropped somewhere with no connection to your address, the immediate risk may be lower. Still, a lost key can turn up in unexpected hands, and the concern changes quickly if it was lost with mail, a work ID, a vehicle registration document or anything displaying your address.
Treat a stolen key ring as a reason to act quickly, particularly if it identifies your home or business. Rekeying external doors is often faster and more affordable than replacing every lock. It gives you a fresh set of working keys and makes the missing one useless.
The same principle applies when a staff member leaves and does not return their keys, swipe card or access fob. For a small business, that may be a straightforward rekey. For a larger site, it may be time to review a master key system, restricted key arrangement or electronic access control so access can be removed without disrupting the entire operation.
After a break-in or attempted break-in
Any forced entry attempt deserves more than a quick look at the door. A lock may still turn after an incident, but the cylinder, strike plate, door frame, hinges or latch can be compromised. Damage that appears minor can affect how well the door resists another attempt.
Replace locks where there is visible damage, signs of tampering, a snapped key left in the cylinder, or doubt about whether keys were taken. A professional assessment should also consider the door itself. Fitting a stronger lock to a weak frame, loose strike plate or damaged jamb will not deliver the protection you expect.
This is a good point to review the whole entry point. Better door hardware, correctly fitted deadlocks where appropriate, reinforced strike plates and window security can work together. For businesses, assess rear doors, plant rooms, storage areas and shared access points as carefully as the front entrance.
Your lock is hard to use or no longer reliable
A lock that sticks, grinds, spins, needs repeated key turns or only works when the door is lifted is not just inconvenient. It may be worn internally, poorly aligned or affected by movement in the door and frame. Forcing the key can cause it to snap, leaving you locked out or unable to secure the property.
Sometimes the fix is an adjustment rather than replacement. A door can sag, weather seals can shift and a strike plate can move out of alignment. But if the lock is old, corroded, heavily worn or repeatedly unreliable, replacement is the safer choice.
External locks can deteriorate faster where they face rain, dust and strong sunlight. Canberra’s cold winters can also make existing alignment problems more obvious, especially on timber doors that expand and contract over time. Do not wait until a lock fails late at night or when you are leaving for work.
Warning signs that should not be ignored
A prompt locksmith inspection is sensible if you notice several of these issues:
- The key is difficult to insert, remove or turn.
- The latch does not engage unless you push or lift the door.
- The lock has become loose, damaged or visibly corroded.
- You have found marks around the cylinder or evidence of tampering.
- Different external doors use an unmanageable collection of old keys.
- The lock is an outdated design with limited resistance to modern attack methods.
One small symptom can be an adjustment. Several symptoms usually point to a lock or door system that needs attention.
When outdated locks are the real issue
Not every old lock is unsafe, but age can reveal gaps in security. Older hardware may offer less resistance to picking, drilling or forced entry than current quality lock systems. It may also use common keyways that are easy to copy without your knowledge.
This matters most for properties with valuable tools, stock, confidential records or multiple occupants. A business that has grown beyond one or two keys may need a planned access system rather than more copies cut over time. Restricted keys can help control duplication, while master key systems can give managers access to nominated areas without giving every staff member unrestricted entry.
For homes, upgrading can make daily use easier as well as safer. Keyless entry may suit families who regularly juggle school bags, work schedules and visiting trades. However, electronic locks still need a quality mechanical installation, secure user management and a plan for battery changes or emergency access. Convenience should not come at the cost of reliable entry when power or batteries fail.
Replace or rekey: make the right call
Rekeying is generally best when the hardware is in good condition and the main issue is who has keys. It is commonly used after moving, a tenancy change, staff turnover or a missing key. It avoids the cost of replacing sound locks while restoring control over access.
Replacement is generally better when the lock is damaged, unreliable, poor quality, no longer suitable for the door or not providing the level of security the property needs. You may also choose replacement when you want all external doors keyed alike, need a deadlock solution, or are moving from basic locks to a more controlled access arrangement.
There are trade-offs. Rekeying is efficient, but it cannot fix weak or failing hardware. Replacing locks creates an opportunity to improve security, but the new lock must be compatible with the door, meet relevant fire and emergency egress requirements, and be fitted correctly. Commercial doors in particular may have compliance, panic exit or fire-rating considerations that should never be overlooked.
Do not forget the doors people use least
Security weak points are often side gates, rear sliding doors, garage access doors, sheds and internal doors leading from a garage into the house. They can be out of sight and may still have an old key arrangement that has not been reviewed for years.
Walk around the property and consider every way a person could enter. Check whether gates latch properly, whether spare keys are hidden outside, and whether keys have been given to people who no longer need them. If your home has just been renovated, ask whether trades keys or temporary access codes are still active.
For commercial premises, include cleaners’ cupboards, delivery entrances, roller doors, server rooms and shared tenancy areas. A simple key register can reveal access issues that are otherwise easy to miss.
Act before a small concern becomes an emergency
The best time to deal with a questionable lock is while you can choose the solution calmly. If access has changed, keys have gone missing, a lock is deteriorating or an entry point has been damaged, arrange an assessment rather than hoping it holds together.
Night & Day Locksmiths can help Canberra property owners, managers and businesses decide whether rekeying, replacement or a broader security upgrade is the sensible next step. A properly working lock should let the right people in, keep everyone else out and give you confidence when you close the door.
