When Should You Rekey Your Locks? A Practical Guide

Rekeying a lock changes the internal configuration of an existing lock cylinder so the old key no longer operates it. I generally recommend considering rekeying when control over existing keys has changed, a key is lost or stolen, or someone who previously had access should no longer be able to enter. When the hardware itself is still in good condition, rekeying can restore control without replacing the entire lock.

The important question is not simply whether a lock can be rekeyed. It is whether rekeying actually solves the security problem. Damaged, worn, outdated, or incompatible hardware may call for replacement instead. The sections below explain the situations that make rekeying worthwhile and how to decide between rekeying and replacing a lock.

What Does Rekeying a Lock Actually Do?

Rekeying keeps the existing lock hardware but changes the internal pin configuration of the cylinder to work with a new key. Once properly rekeyed, the previous key should no longer operate that cylinder.

This makes rekeying particularly useful when the concern is who has a working key, rather than the physical condition of the lock.

For example, a homeowner who moves into a property may have perfectly functional deadbolts but no reliable way to know how many copies of the previous keys exist. Rekeying can reset access while allowing the existing hardware to remain in place.

When Should You Rekey Your Locks?

There is no universal calendar date when every property needs to be rekeyed. The strongest reasons are usually connected to a change in who may have access.

1. You Just Moved Into a New Home

Moving into a new home is one of the clearest situations for rekeying.

Previous owners, family members, contractors, real estate professionals, cleaners, or other service providers may have had access to the property over time. Even if every key provided at closing is returned, there is no reliable way to know whether additional copies exist.

Rekeying the exterior locks lets the new owner establish a known starting point for key access.

For homeowners who need broader residential security work, residential locksmith services can also address lock installation, lockouts, and related entry hardware.

2. Your House Keys Were Lost or Stolen

A missing key creates uncertainty about who might eventually find or use it.

The risk becomes more serious when the key was attached to something identifying the property, such as an address, vehicle registration, or personal information.

Rekeying makes the missing key unusable on the affected cylinder after the work is completed. If the keys were stolen rather than simply misplaced, acting promptly is particularly important.

3. A Former Resident or Roommate Moved Out

Returning a key does not necessarily prove that no other copy exists.

A roommate, tenant, or household member may have made a duplicate during the time they had access. If they no longer have permission to enter, rekeying provides a clean way to remove their previous key from the system.

This is especially relevant for landlords managing properties between occupants.

4. An Employee or Contractor No Longer Needs Access

Businesses face a similar issue when employees, contractors, cleaners, maintenance workers, or vendors leave.

The goal should not be to assume that a former worker will misuse a key. The practical issue is simply that access permissions have changed.

For a commercial property, rekeying can be part of an organized access-control process after employee turnover or changes in responsibility. Businesses can also use commercial lock rekeying when existing hardware is suitable but key access needs to change.

5. Your Keys Were Given to Several People

Homeowners often provide spare keys to relatives, neighbors, pet sitters, cleaners, contractors, or other trusted people.

That may be reasonable while access is needed. The problem starts when the list of key holders becomes unclear.

If you cannot confidently identify everyone who can unlock a particular door, rekeying can establish a new set of authorized keys.

6. You Experienced a Break-In or Security Incident

After a break-in or attempted break-in, the lock should be inspected rather than automatically rekeyed.

If the existing cylinder is still structurally sound and the concern involves a potentially compromised key, rekeying may solve part of the problem. But forced entry can also damage the lock, latch, strike plate, door, or frame.

In that situation, lock installation services or hardware repair may be more appropriate than rekeying alone.

The key point is that rekeying changes access credentials; it does not repair physically damaged hardware.

Should You Rekey or Replace the Locks?

This is where many property owners make the wrong decision.

Rekeying and replacement solve different problems.

Situation	Rekey	Replace
Existing lock works properly	Usually suitable	Optional
Lost or unreturned key	Usually suitable	Not always necessary
New property ownership	Usually suitable	Optional upgrade
Employee or tenant turnover	Often suitable	Sometimes
Lock is physically damaged	Usually not enough	Usually better
Lock is heavily worn	Usually not enough	Better choice
Want newer lock technology	Not enough	Better choice
Want different hardware or appearance	Not enough	Better choice
Existing hardware is incompatible	May not be possible	May be required

If the existing hardware is strong, functional, and compatible with the desired key system, rekeying can make sense.

If the lock is damaged, corroded, difficult to operate, or no longer provides the desired level of security, replacing it is usually the better long-term solution.

When Is Replacing a Lock Better Than Rekeying?

A new key does not fix a mechanically failing lock.

Replacement deserves consideration when:

• The key frequently sticks or is difficult to turn.
• The cylinder is damaged.
• The lock is loose or does not latch correctly.
• The hardware shows significant corrosion or wear.
• The lock no longer fits the door properly.
• A higher-security cylinder is needed.
• The property owner wants smart or electronic access.
• The existing lock is incompatible with the desired key system.

In these situations, simply changing the internal pins would leave the underlying hardware problem unresolved.

Can Multiple Locks Be Rekeyed to One Key?

Sometimes, yes.

If compatible locks use the same keyway and can be configured within the same key system, a locksmith may be able to key several locks alike.

This can be useful for a home with multiple exterior doors. Instead of carrying separate keys for the front, rear, and side entrances, compatible locks may be configured to operate with one key.

However, different brands or incompatible lock platforms cannot always be combined simply by changing the pins. Hardware compatibility should be checked before promising a single-key setup.

For homeowners considering a broader lock upgrade, residential lock installation may be appropriate when existing hardware cannot support the desired arrangement.

How Often Should You Rekey Your Locks?

There is no reliable rule saying every home must be rekeyed every three or five years.

The more useful question is whether control over the keys has changed.

A homeowner who knows exactly who has every key and has experienced no security or access changes may not have a reason to rekey on a fixed schedule.

Rental properties and businesses are different. Tenant turnover, employee changes, contractors, and incomplete key records can create regular reasons to review access.

If you cannot answer “Who currently has a working key to this door?”, that uncertainty is often a stronger reason to consider rekeying than the age of the lock itself.

What Should You Check Before Rekeying?

Before scheduling the work, consider five things.

Check the Condition of the Lock

A locksmith should determine whether the cylinder and surrounding hardware are functioning correctly.

Identify Every Door That Needs Access Changed

Do not focus only on the front entrance. Side doors, garage entrances, storage rooms, gates, and other keyed access points may also need attention.

Determine Who Should Receive New Keys

A rekey is most useful when the new key distribution is intentional.

Check Hardware Compatibility

If several doors need to operate from one key, confirm that the locks can be configured together.

Consider Whether Security Needs Have Changed

If the goal has moved beyond eliminating old keys—for example, toward high-security hardware or electronic access—replacement may be more appropriate.

What Happens If You Lose a Master Key?

A master key deserves more attention than an ordinary individual key because it may provide access to several doors.

The appropriate response depends on how many locks the key operates and how the property’s key system was designed.

For businesses with multiple access levels, rekeying should be planned carefully rather than changing random cylinders. A properly documented commercial key system makes it easier to identify which doors are affected.

This is one reason commercial locksmith services can be valuable when access requirements involve multiple employees, departments, or buildings.

Is Rekeying as Secure as Replacing a Lock?

When the existing lock is in good condition, properly performed rekeying can restore control over which keys operate that cylinder without replacing the physical hardware.

However, rekeying does not upgrade the physical strength or design of the lock.

For example, if an older cylinder has weaknesses that concern the property owner, changing its internal pins does not transform it into a modern high-security lock.

The decision should therefore separate two questions:

Who should be able to open this lock?

and

Is this lock itself suitable for the property’s security needs?

Rekeying primarily addresses the first question. Replacement can address both.

Frequently Asked Questions

Does a locksmith need the original key to rekey a lock?

Not necessarily. A missing key can make the process more involved because the locksmith may first need to gain access to or remove the cylinder. The exact procedure depends on the lock and its condition.

How long does it take to rekey a lock?

The time depends on the lock type, number of cylinders, accessibility, and whether additional work is required. A standard cylinder may be rekeyed relatively quickly, while multiple or specialized locks can take longer.

Can all locks be rekeyed?

No. Many common pin-tumbler locks can be rekeyed, but compatibility varies by lock design, cylinder type, manufacturer, and security system.

Is rekeying cheaper than replacing a lock?

Often, when existing hardware is in good condition, rekeying can cost less because the main hardware remains in place. The actual cost depends on the number and type of locks and the required service.

Should I rekey my locks after buying a house?

It is a sensible security step because previous occupants and service providers may have had copies of the keys. Rekeying establishes a new set of working keys without necessarily replacing functional hardware.

What is the difference between rekeying and replacing a lock?

Rekeying changes which key operates an existing lock cylinder. Replacing removes the existing hardware and installs a different lock. Rekeying addresses access control, while replacement can also address damaged hardware or a need for different security features.

Final Thoughts

The best time to rekey a lock is usually when key access has changed or is no longer certain. Moving into a property, losing a key, ending a tenancy, changing employees, finishing a contractor relationship, or experiencing a security concern can all justify reviewing who has access.

Rekeying is not automatically better than replacing a lock. If the hardware is worn, damaged, outdated, or unsuitable for the property’s security requirements, replacement may provide a better solution. If the lock is in good condition and the primary concern is old or unknown keys, Old Glory Locksmith can provide rekeying to help restore control over access.

The decision becomes much easier when the condition of the hardware and the property’s actual access requirements are considered together.