Commercial Rekeying Service: What It Is and When Your Business Needs It

What Rekeying Does Inside a Commercial Lock

Most commercial locks - mortise locksets, cylindrical levers, and the rim cylinders that operate panic bars - are built around a pin tumbler cylinder. Inside are stacks of spring-loaded pins. When the right key slides in, its cuts raise every pin stack to the same height, called the shear line, and the cylinder turns.

Rekeying means removing that cylinder, taking out the old bottom pins, and loading new ones matched to a fresh key cut. The old keys stop working immediately because their cuts no longer line up. Nothing about the door, the lever, the latch, or the strike plate changes.

That is the main reason rekeying is so common on commercial doors: heavy-duty hardware built to ANSI/BHMA Grade 1 standards is designed to survive decades of daily traffic. Rekeying lets you keep that investment and change only who holds a working key.

Interchangeable Cores: The Fast Lane for Commercial Rekeying

Many offices, schools, and retail buildings use small format interchangeable core (SFIC) locks - you can spot them by the figure-eight shape on the cylinder face. These cores are removed with a special control key rather than by taking the lock apart. A technician can pull the old core and seat a freshly pinned one in under a minute per door.

SFIC cores usually carry six or seven pin stacks, and larger facilities often keep spare cores pinned and ready so a lost key never leaves a door unsecured for long. Large format interchangeable cores (LFIC) work on the same swap principle but fit specific brands of hardware, so identifying which format your doors use is one of the first things a locksmith checks.

Keyed Alike, Master Keyed, and Restricted Keyways

Rekeying a business is rarely one lock at a time. Three arrangements come up constantly:

• Keyed alike: several doors share one identical key - convenient for a small shop with a front door, back door, and office.
• Master keyed: each door has its own change key, but one master key opens them all. This works by adding thin master pins to each pin stack, creating a second shear line in the cylinder.
• Restricted keyways: key blanks that are not sold at hardware stores, so staff keys cannot be copied casually.

Master keying has a real trade-off: every master pin added to a stack creates extra shear lines, which means more theoretical key cuts that could operate the cylinder. A carefully planned key chart keeps that in check. A locksmith can map out who needs access to which doors before any pinning starts, so the system stays both convenient and tight.

When to Rekey and How to Prepare

Businesses typically rekey after a specific event rather than on a schedule. The common triggers:

• Staff turnover: an employee with a key leaves, especially on difficult terms.
• Lost or stolen keys: a ring of building keys disappears and you cannot know who found it.
• New occupancy: you move into a space where previous tenants, cleaners, and contractors all held keys.
• After construction: contractor keys circulated freely during a buildout.
• Key sprawl: years of piecemeal lock work left you carrying a pocketful of unrelated keys worth consolidating.

Before calling, walk the building and count every keyed door, including back doors, storage rooms, and gates. Note any figure-eight core faces, gather the keys you currently use, and think through who genuinely needs access to what. Those details determine whether a simple keyed-alike rekey or a small master key system serves you better. Call (916) 913-5080, describe your doors and your key situation, and confirm whether the service can help before any technician is scheduled.

Frequently Asked Questions

Can interchangeable core locks be rekeyed without taking the hardware apart?

Yes. Small format interchangeable core (SFIC) locks are designed for exactly this. A control key turns the core slightly past its normal position and releases it from the housing - no screwdriver needed. A locksmith can repin the core on the spot or exchange it for one already pinned to your new key. That is why SFIC is common in schools and offices where dozens of doors may need new keys on the same day.

Can the lock on a panic bar or exit device be rekeyed?

In most cases, yes. The push bar itself has no key; the outside lever or pull trim is operated by a rim cylinder or, on some models, a mortise cylinder threaded into the trim. Both are pin tumbler cylinders and can be repinned to a new key like any other lock. Rekeying does not touch the exit device's latch, its dogging feature, or its life-safety function - people inside can always push their way out.

Can all my doors share one key if the locks are different brands?

Only if the cylinders share the same keyway - the shaped channel the key blank slides into. Different brands often use different keyways, so one key physically cannot enter both locks. A locksmith can check the keyways, swap mismatched cylinders for compatible ones, or set up a master key system so one key opens everything while each door keeps its own change key. Have your current keys in hand when you call so the options are clear.

Call (916) 913-5080 about commercial rekeying service.