What a rekey does for a business
Rekeying changes the internal pins of a lock cylinder so that a new key works and every previous key does not. The lock body, the handles, the door hardware and the finish all stay the same. From the street nothing looks different. From a security point of view, every key that was ever cut for that lock is now just a piece of metal.
For a business, that is valuable because keys spread in ways owners rarely track. Employees come and go. Managers change shifts. A cleaning company rotates its crews. A contractor borrows a key for a week and returns it, but not before a copy was made for convenience. A rekey resets all of that at once without the cost of new hardware.
The question is not whether rekeying works. It does. The question is when it is worth doing, and that depends on what has changed. Rekeying for no reason is wasted money. Failing to rekey after a clear trigger leaves a door open to people you did not intend to let in.
This guide goes through the triggers roughly in order of urgency. If your business has a written key policy, many of these decisions become automatic. If it does not, the key control policy guide explains how to write a simple one.
Rekey now
The triggers that should not wait.
In each of these, somebody who should not have access may already have it.
A key was lost or stolen. If a key ring disappears from a manager's car, or a bag is stolen with the shop keys inside, assume someone else has them. Keys lost somewhere near the business, or stolen along with anything that identifies the business, are the most urgent of all. Rekey every lock the missing keys opened, the same day if possible.
An employee left on bad terms. A dismissal, a resignation after a dispute, or anyone who left angry. Even if their key was returned, copies of a standard key are easy to make. The rekey protects the business, and it also protects the former employee from suspicion if anything goes wrong later.
A break-in or attempted break-in. After any forced entry, the lock may be damaged, and keys kept inside the premises may have been taken or copied. Repair or replace damaged hardware, and rekey the rest. The after a break-in guide covers the first steps.
Unexplained losses. Stock, cash or equipment going missing from a locked area with no sign of forced entry usually means someone has a key who should not. Rekeying that area, and tightening who holds the new keys, is often the fastest way to learn whether the losses stop.
A partner or co-owner leaves. When a business relationship ends, the departing party often holds master keys. Rekey the master level as part of the separation, regardless of how amicable it is.
Rekey soon
The triggers worth planning around.
| Event | Why rekey | Timing |
|---|---|---|
| Moving into new premises | The previous tenant, their staff, the landlord's contractors and the builder may all have keys. | Before you move stock or equipment in. |
| Buying an existing business | Every key the previous owner issued is still valid. | On or immediately after the handover. |
| A key holder leaves on good terms and returns the key | Copies are possible on standard keys. | Depends on the access level. Master key holders, yes. General staff, often not needed. |
| Cleaning or security contractor changes | Previous contractor's staff held keys. | When the new contract starts. |
| Renovation or fit-out finished | Builders and trades often had keys for weeks. | At handover from the contractor. |
| Key register cannot be reconciled | You no longer know who has access. | As soon as practical, then restart the register. |
| Moving from standard to restricted keys | Existing copies can no longer be controlled. | When the new system is installed. |
Staff departures
Not every exit needs a rekey.
A business with regular staff turnover cannot rekey every lock every time someone leaves. It would be expensive and disruptive, and in many cases unnecessary. The decision should depend on three things: what the key opened, how the person left, and whether the key came back.
A general staff member who held only a front door key, left on good terms and returned it, is usually a low risk. Many businesses log the return and move on. The same person on a restricted keyway system is even lower risk, because unauthorized copies are much harder to obtain.
A manager who held a master key is different. Even on good terms, a master key opens everything, and the consequences of an unknown copy are much greater. Rekeying the master level after a manager departs is a reasonable standard, especially on standard keyways.
A key that was not returned changes everything. Whatever the reason, whether lost, forgotten or refused, the locks it opened should be rekeyed. Waiting for it to turn up is a gamble with the whole business.
This is where a well planned master key system pays for itself. If each role holds only the keys it needs, a departure affects only a small number of doors. A single front door rekey is far cheaper than an entire building. The master key systems page explains how this is planned.
New premises
Moving into a space someone else used.
New commercial premises in Wilmington, Newark or Dover almost always come with an unknown history of keys. The previous tenant had staff. The landlord may have a master for the building. Agents showed the space with a lockbox. Contractors fitted it out. Some of those keys will open your doors on the day you move in.
Before you move anything of value in, rekey or replace the cylinders on every exterior door and every interior door you want to control. If the landlord needs access, agree how that will work, and whether their key will be part of your system or a separate arrangement. Many leases address landlord access, and it is worth reading that clause before the locksmith arrives.
New premises are also the best time to plan properly. If you will need different access levels for different staff, design the master key system now, before keys are issued. If you want restricted keys, install them now, before standard keys are copied. Retrofitting either one later is possible but more disruptive.
Check the hardware at the same time. Storefront locks, rear exit doors, panic bars and door closers in commercial spaces are often worn when a new tenant arrives. Fixing them now, while you are already having work done, costs far less than a separate visit later. The storefront door locks and panic bar pages cover those.
Rekey or something else
When a rekey is not the right answer.
| Situation | Better answer |
|---|---|
| Lock was damaged in a break-in | Repair or replace the damaged hardware. Rekeying a broken lock does not restore it. |
| Staff turnover is constant | Access control on the main entrance, so credentials are disabled rather than locks rekeyed. |
| Keys keep getting copied | A restricted keyway system, so copies need authorization. |
| One key opens every door | A master key system that gives each role only what it needs. |
| Lock is worn out or unreliable | Replacement. A new key in a failing lock is still a failing lock. |
| Door or frame is weak | Hardware and door reinforcement. A new key does nothing against force. |
| Electronic lock codes are the problem | Change the codes and review who holds them. The mechanical override may also need a rekey. |
Rekeying fixes a key problem, not a lock problem
If the problem is who has keys, rekeying is the answer. If the problem is the strength of the door, the reliability of the lock, or the design of your access system, rekeying on its own will not fix it, and a good locksmith should tell you so plainly.
Doing it without closing
How a business rekey is scheduled.
A business rekey should not mean closing for the day. Most commercial rekeys can be done early in the morning, after closing, or door by door during the day while the business keeps trading. The technician removes each cylinder, repins it, tests it and reinstalls it before moving to the next, so every door stays lockable throughout.
- Count the doors in advance. Front, rear, offices, stock rooms, cabinets, gates and padlocks. The count decides how long the visit takes and what gets brought.
- Decide on access levels first. If you want different keys for different roles, plan it before the technician arrives rather than on the day.
- Know what hardware you have. Storefront cylinders, rim cylinders, lever sets and interchangeable core systems are handled differently. A photo of each lock helps.
- Choose the time. Before opening or after closing is usually the least disruptive, and for urgent triggers the right time is as soon as possible.
- Plan key distribution. Have the key register ready so new keys can be logged and signed for the moment they are handed out.
- Collect the old keys anyway. They no longer work, but collecting them avoids confusion and reminds everyone that the change has happened.
What drives the effort
Why one business rekey takes an hour and another takes a day.
| Factor | Effect on the job |
|---|---|
| Number of cylinders | The biggest factor. Every cylinder is removed, repinned, tested and refitted. Doing them all in one visit is far more efficient than several visits. |
| Type of hardware | Standard lever sets are quick. Storefront mortise cylinders, rim cylinders on exit devices and older mortise locks take longer to remove and refit. |
| Interchangeable core systems | Where a business already uses removable cores, cores can be swapped in seconds with a control key, which makes future rekeys very fast. |
| Master keyed or not | A master system needs the pinning calculated for every level. It takes planning but saves effort at every later departure. |
| Restricted keyways | May need authorized parts and key blanks ordered in advance, so allow lead time unless it is an emergency. |
| Condition of the cylinders | Seized, dirty or damaged cylinders have to be dealt with before they can be rekeyed, and some will need replacing. |
| The hour | Planned daytime work is simpler to arrange than an emergency call at night, though urgent triggers justify the call. |
If your business rekeys often, ask about interchangeable cores. Once they are installed, changing a door becomes a matter of swapping a core rather than repinning a cylinder on site, and a spare set of cores can be kept ready for the next departure.
Routine rekeys: is there a schedule?
Some businesses ask whether they should rekey on a schedule, for example every year or every few years, regardless of events. There is no universal rule, and we would not recommend spending money on a rekey just because the calendar says so. The right approach depends on how well you know who holds keys.
A business with a reliable register, restricted keys and a strict return process may go many years without needing a rekey, because every key is accounted for. A business with standard keys, informal issuing and high turnover may find that its key population drifts out of control within a year or two. For that second kind of business, a planned rekey paired with a proper register is a way to reset and start controlling keys properly.
An annual key audit is a better habit than an annual rekey. Walk the register, confirm each key is still held by the right person, and rekey only where the audit shows a problem. The audit costs nothing but time. The rekey happens only when it is needed.
Some industries have their own expectations. Businesses handling controlled substances, firearms, financial records or client data may have requirements from regulators, insurers or contracts about access control. We do not advise on those requirements, but we can help you meet them once you know what they are. Check with your insurer or your industry body.
Delaware businesses
Where the triggers show up.
Restaurants and bars in Wilmington and Newark tend to have high turnover and late closing shifts, and the rear door is often opened by whoever is closing that night. A small master system and restricted keys cut the number of rekeys needed.
Professional offices along the Route 202 corridor and in Dover see fewer departures but more master key holders, and each departure of a senior person is a bigger decision.
Retail units in Christiana and Bear often change hands, and new tenants inherit keys from the previous business. The first week in the unit is the time to rekey.
Industrial and logistics sites around New Castle and Smyrna have many doors, many drivers and contractors, and often padlocks on gates and containers that are forgotten in a rekey. Include them in the count.
Agricultural and rural businesses across Kent County often have outbuildings, fuel stores and equipment sheds with keys that have been shared among family and workers for years. A rekey paired with a simple register brings them under control.
Related
What to consider alongside the rekey.
Most requestedCommercial Rekey
Every door, done around your hours.
PlanningMaster Key Systems
So the next departure affects fewer doors.
Copy controlRestricted Keyways
Stops the copies that make rekeys necessary.
ElectronicAccess Control
Disable a card instead of rekeying a door.
UpgradeHigh Security Locks
Where the lock itself needs to be stronger.
UrgentEmergency Locksmith
For the triggers that cannot wait until morning.
Where we do this
Business rekeys across both counties.
Questions
About rekeying a business.
How quickly should we rekey after a lost key?
As soon as possible, ideally the same day. If the key was lost with anything identifying the business, or stolen, treat it as urgent. Every day between the loss and the rekey is a day someone else could have access.
Do we need to rekey every time someone leaves?
Not always. If the person held only a low level key, left on good terms, and returned it, many businesses simply log the return. If they held a master key, left on bad terms, or did not return the key, rekey the affected locks.
Can a rekey be done without closing the business?
Yes. Cylinders are rekeyed one at a time and reinstalled before moving to the next door, so every door remains lockable. Many businesses choose early morning or after closing to avoid disruption.
Is it cheaper to rekey or install access control?
A single rekey is far cheaper than access control. If you find yourself rekeying the main entrance several times a year because of turnover, access control on that door may cost less over time. It depends on your turnover and budget.
We just bought an existing business. What first?
Rekey on or immediately after the handover. The previous owner and every person they gave keys to can still open the doors. Change alarm codes and any keypad codes at the same time.
Our landlord has a master key. Do we rekey around it?
Read your lease first, since many leases address landlord access. Some landlords require their master to work. If so, your locks can be rekeyed within the building's system. If not, agree in writing how the landlord will access the space.
Should padlocks and cabinets be included?
If their keys were held by the same people as the doors, yes. Gates, containers, cabinets and cash drawers are often forgotten and left on old keys. Include them in the count when you book.
Can high security or restricted locks be rekeyed?
Usually, yes, though they may need restricted parts and proof of authorization from the business. That is the system working as intended. It may take a little longer to arrange.