That front door lock usually gets ignored until something goes wrong. A key goes missing, the deadbolt starts sticking, a tenant moves out, or you notice the door never fully latches unless you shoulder it shut. If you’re asking when should locks be changed, the real answer is this: not on a fixed calendar, but whenever your security, control, or reliability is in doubt.
For most homes and small businesses, lock changes are less about age alone and more about risk. Sometimes a full replacement is the right call. Other times, rekeying gives you the security benefit you need without replacing the hardware. The key is knowing which situations call for fast action and which ones can wait a day or two for a planned service visit.
When should locks be changed after a move?
One of the clearest times to change or rekey locks is right after moving into a new home, apartment, or commercial space. You may get a full set of keys at closing or from a landlord, but you rarely know how many copies are still out there. Previous owners, former tenants, contractors, dog walkers, house cleaners, and relatives may all still have access.
This is why move-in rekeying is such a common request. If the existing lock hardware is in good shape, rekeying often makes more sense than full replacement. It changes the internal pins so the old keys no longer work. You keep the lock body, but you regain control over who has access.
If the hardware is damaged, outdated, mismatched, or low quality, then changing the locks entirely is usually the better investment. A new home is also a good time to upgrade to higher-security deadbolts or smart locks if convenience and access control matter to you.
Lost keys, stolen keys, and unknown copies
If your keys are lost and you have no idea where they ended up, treat it as a security issue, not just an inconvenience. The risk goes up if your keys had any identifying information attached, like a tag with your address, business name, or unit number.
Stolen keys are even more urgent. In that case, changing or rekeying the affected locks should move to the top of your list. Waiting a week because nothing happened yet is a gamble. Most people who call in this situation are not overreacting. They are doing the right thing.
There is some nuance here. If you lost a house key somewhere far from home with no identifying details, rekeying may be sufficient and can often be done quickly. If you lost a master key, office key, or a key connected to a recent dispute, a wider lock change plan may be necessary.
After a break-in or attempted break-in
A break-in is an obvious reason to change locks, but an attempted break-in can be just as important. Even if the intruder never got inside, the lock, strike plate, frame, or door may have been compromised. A deadbolt can still turn after an attack and still be less secure than it looks.
In these cases, the lock should be assessed along with the full door assembly. Replacing the cylinder alone may not solve the problem if the latch alignment is off, the strike screws are too short, or the frame is split. Property re-securing is about restoring real security, not just making the door appear functional.
For businesses, this is especially important. If there was forced entry, employee access points, rear doors, panic hardware, and side entrances may all need inspection. The lock that failed is not always the only weak point.
When locks are worn out or unreliable
Sometimes the issue is not a crime or a missing key. It is wear. If your key sticks, the lock only works after several tries, the cylinder feels loose, or the deadbolt does not throw cleanly, your lock may be nearing failure.
People often wait too long here. A lock that works “most of the time” is already telling you there is a problem. It may leave you locked out at the worst moment, or it may stop securing the door properly without you realizing it.
That does not always mean immediate replacement. Some problems come from poor door alignment, weather swelling, loose hardware, or a badly cut key. A professional inspection can tell you whether the fix is adjustment, repair, rekeying, or full lock replacement. But if the lock body is worn, corroded, or internally damaged, replacing it is usually the more dependable option.
Rental turnover and employee changes
For landlords and property managers, tenant turnover is one of the most common reasons locks should be changed or rekeyed. Even with a smooth move-out, there is no practical way to track every copied key. Fast turnover between tenants is not a reason to skip it. It is a reason to have a system.
Rekeying between tenants is often the most cost-effective approach, especially for multi-unit properties with compatible hardware. It helps protect the incoming tenant, lowers liability concerns, and keeps key control manageable.
The same principle applies to businesses when an employee leaves, especially if the departure was tense or the employee had broad access. If keys were not returned, or if there is any doubt about copied keys, rekeying or changing locks makes sense. For offices, storefronts, and small commercial buildings, this may also be the right time to review whether mechanical locks are still the best fit or whether keypad or electronic access would offer better control.
Divorce, roommate changes, and other personal situations
Not every lock change starts with a hardware failure. Sometimes the issue is personal safety and peace of mind. Separation, divorce, roommate disputes, caregiver changes, and changes in household access all create situations where key control matters immediately.
This is one of those areas where waiting for a more convenient time can create unnecessary exposure. If someone who once had legitimate access should no longer be able to enter, changing or rekeying locks is a practical step, not an overreaction.
For households under stress, the right locksmith approach is calm, discreet, and efficient. The goal is to restore control without adding more disruption to an already difficult situation.
Should you change locks or just rekey them?
This is where many people get stuck. They know something needs to be done, but they are not sure which service they actually need.
Rekeying is usually the smarter choice when the lock hardware is still in good condition and your main concern is old keys still working. It is common after move-ins, tenant turnover, lost keys, and staffing changes. It is generally faster and less expensive than replacing every lock.
Changing the locks is the better option when the hardware is damaged, outdated, poor quality, or no longer matches your security needs. It also makes sense if you want to upgrade appearance, standardize keyways, add smart access, or replace mismatched locks throughout a property.
If you are dealing with older doors in Pittsburgh-area homes, there can also be fit and finish considerations. Some existing hardware is nonstandard, heavily worn, or installed over old repairs. In those cases, replacement may reveal issues that need to be corrected so the new lock performs properly.
How often should locks be changed if nothing is wrong?
There is no universal schedule that fits every property. A lock on a lightly used side door in a stable household may last years without needing replacement. A storefront, rental unit, or busy office with frequent key turnover may need rekeying much more often.
Instead of thinking in terms of years alone, think in terms of events and performance. Has access changed? Has a key gone missing? Has the lock become inconsistent? Has there been an attempted break-in? Are you relying on hardware that was cheap to begin with? Those are better triggers than a date on the calendar.
Routine inspection helps. Test the key, feel for looseness, watch how the bolt aligns with the strike, and pay attention to sticking or grinding. Small warning signs tend to show up before full failure.
A practical rule for deciding fast
If you no longer trust who has a key, rekey or change the locks. If the lock no longer works reliably, repair or replace it before it fails completely. If there has been forced entry, have the lock and the whole door security setup checked right away.
That simple rule covers most situations. It also helps cut through the hesitation people feel when they are trying to balance cost, urgency, and security.
A dependable locksmith should be able to tell you plainly whether you need rekeying, replacement, adjustment, or a broader security fix. Honest pricing and clear recommendations matter here. So does licensed, insured workmanship, especially when the job affects your home, rental unit, or business access.
If you are unsure, do not wait for the lock to make the decision for you. A little attention now is usually easier than dealing with a lockout, a security breach, or a door that will not secure at the end of a long day.