Should You Rekey After an Employee Leaves?

Should you rekey your business after an employee leaves? If that person ever carried a key and you cannot account for every copy, yes. Rekeying changes the pins inside your existing locks so a new key works and every old key stops working immediately. Same hardware, new key, zero doubt about who can get in. It is faster and far less disruptive than replacing locks, and most small businesses can be rekeyed in a single visit.

This guide walks through when rekeying is the right call, why a returned key settles nothing, how restricted keyways stop the copy problem at the source, what turnover means if you run a master key system, and how to audit who actually holds keys to your space. Tim's Locksmith Service rekeys businesses across Ventura County and San Diego County, with evening availability seven days a week.

Why a Returned Key Settles Nothing

The departing employee handed the key back. Good. It proves almost nothing.

Any ordinary key can be copied in minutes at a hardware store, a big-box kiosk, or a self-serve machine, with no questions asked. It can be photographed and cut from the picture. It can be lent to a spouse, a friend, or a coworker for a weekend and duplicated without the borrower ever mentioning it. Over a few years of employment, you have no realistic way to know how many copies of that key exist or where they are.

Your lock does not recognize people. It recognizes a cut pattern, and every copy of that pattern is equal in its eyes. The only way to retire all the unknown copies at once is to change the pattern the lock accepts. That is what a rekey does, and it is why the returned key on your desk should not end the conversation.

When Rekeying Is the Right Call

You do not need to rekey after every routine departure. You do need to rekey when the math of risk changes. The clear cases:

• A termination that ended badly, or any departure with hard feelings
• A manager or keyholder leaving, since their key usually opened more than one door
• A key reported lost or stolen, whether or not anyone left
• A change of cleaning crew, maintenance vendor, or anyone else who held an after-hours key
• Moving into a new space, because the previous tenant's keys are all still out there
• After a break-in or attempted break-in, alongside any needed repairs

And one quieter case: if you cannot remember the last time the business was rekeyed and keys have passed through many hands, a fresh start resets your key population to a known list. From there, a key log keeps it known.

Rekey or Replace? How to Decide

Rekeying and replacement solve different problems, and turnover usually calls for the cheaper one.

Rekey when the hardware is sound and the only problem is who might hold a key. The lock body, lever, and deadbolt stay. Only the pinning changes. This is the right answer for most turnover situations, and it works on storefront mortise cylinders just as well as on standard commercial levers.

Replace when the hardware itself is the problem: worn-out latches, a lock that was drilled or damaged, bargain-grade hardware on a door that guards real value, or a functional change like moving from a keyed lever to a keypad. Replacement is an upgrade decision, not a turnover decision.

The two mix well. A common package is new commercial-grade hardware on the exterior doors and a rekey of everything else, all keyed to one fresh key so your ring gets lighter, not heavier.

Restricted Keyways Stop the Problem at the Source

If you find yourself rekeying every time someone quits, the real problem is that your keys can be copied anywhere by anyone. A restricted keyway fixes that.

With standard locks, blanks for your key are sold everywhere, so any holder of the key controls duplication. With a restricted keyway, the blank itself is controlled by the manufacturer and issued only through authorized dealers. Duplicates require the authorization of the person on file, usually the owner, with a signature or ID check. An employee simply cannot get a copy made on a lunch break, because no kiosk and no ordinary shop can obtain the blank.

Pair the restricted keyway with high-security cylinders and you also pick up drill and pick resistance. Turnover stops meaning automatic rekeys. You collect the numbered key, check the log, and move on with your day.

If You Run a Master Key System

Turnover inside a master key system needs one extra question answered before anyone touches a lock: which level of key did the departing person hold?

If they held a change key, the fix is contained. Rekey the lock or the small group that key opened, cut new change keys for the remaining staff who use those doors, and the rest of the system is untouched. The master keeps working everywhere.

If they held a master or sub-master, the job is bigger, and there is no honest way around it. Every lock under that key has to be repinned, because every one of those doors is exposed. This is why masters belong in the fewest hands possible and why each one should be logged by name.

If you are not sure what their key opened, that is the system telling you the documentation slipped. Our guide on master key systems covers the records worth keeping current.

Run a Key Audit Before You Decide

Before you rekey anything, spend an hour finding out what is actually out there. The audit is simple.

1. List every keyed door, gate, cabinet, and padlock in the business.
2. List every key ever issued, who received it, and what it opens. If your keys are stamped with code numbers, this step is fast. If not, it is reconstruction from memory, which is itself the lesson.
3. Collect and count. Match keys in hand against keys issued.
4. Anything unaccounted for defines your rekey list. Doors whose every key is verified can wait.

Then set up the habit that makes the next audit painless: numbered keys, a sign-out log with names and dates, one person who owns the log, and a walk through it twice a year and at every departure. Ten minutes per exit beats rekeying the building on a guess.

We serve Ventura County including Oxnard, Ventura, Thousand Oaks, Simi Valley, Camarillo, and San Diego County including San Diego, Chula Vista, Oceanside, Carlsbad, Escondido.