What rekeying actually changes
A pin tumbler cylinder, the kind found on most office, shop and warehouse doors, contains a row of small pins of different lengths. The key lifts each pin to exactly the right height so that a line of separation, the shear line, is clear and the cylinder can turn. Rekeying means taking the cylinder apart, replacing or rearranging the pins, and cutting new keys that match the new arrangement. The old key, which matched the old pin heights, no longer lifts the pins to the shear line, so it stops working.
The lock itself stays in the door. The faceplate, the latch or bolt, the handle and the finish are untouched. For a business, that is a major advantage, because it keeps the door looking the same, avoids drilling or reshaping the door, and usually takes a short time per cylinder.
It is important to be honest about what rekeying does not do. It does not make a weak lock strong. If a door has a poor quality latch, a loose frame or a gap that can be pried, a new key does not fix that. Rekeying changes who can use the lock with a key. It does not change how the door resists force, which is a separate topic covered in the page on commercial lock audits.
It also does not erase copies that are made later. If a new key is copied at a corner shop without any control, the exposure comes back. That is the reason some businesses pair a rekey with a restricted key system, discussed on the page about restricted keyways.
Rekey or replace: the practical comparison
Owners often ask whether it is better to change the locks entirely. The honest answer is that it depends on the hardware and the reason for the change. Rekeying works well when the lock is in good condition, the brand is common enough that parts are available, and the goal is to cut off old keys. It is quicker per door and keeps existing hardware in use.
Replacing makes sense when the lock is worn or damaged, when it is a low grade lock that does not meet what the business now needs, when the hardware is discontinued, or when the business wants a different feature such as a keypad, a card reader or a higher security cylinder. Replacement also makes sense after a break-in that damaged the lock body.
There is one more case. Some locks are difficult to rekey, either because they are a proprietary design or because the lock body is so worn that new pins will not sit properly. A technician will tell you which situation you are in after looking at the lock. If a lock cannot be rekeyed reliably, replacing is the honest recommendation.
A simple test helps. If the lock still works smoothly, the latch is solid and the key issue is the only issue, rekey. If the lock is old and tired, replace and rekey together. Our guide on rekey or replace, which is right covers the thinking in more detail, and the guide on repair or replace door hardware addresses the broader question.
Whichever path you take, price is given by phone before work, and a service call charge applies to dispatch, explained up front.
Staff changes and the moment to act
The most common trigger for a commercial rekey is a change in who works at the business. Not every departure needs one. A part time cashier who held a front door key for a few weeks and left on good terms is a different situation from a manager who held master access and was dismissed. The risk is not only theft. It is also the quiet possibility that a former employee, a former contractor or a former cleaner can enter at a time when nobody expects them.
A useful way to think about it is in terms of access, not trust. What could this key open? The front door, the back door, the stockroom, the office, the safe room, the cash drawer? How many keys were issued, and are all accounted for? Did the person keep the key, hand it back, or leave it unclear? If the answer to the last question is uncertain, a rekey is a reasonable step.
Timing matters. Rekeying the day a key holder leaves, before anyone has a chance to wonder, avoids awkward questions later. If a key is simply not returned, a short delay turns into a gap in security. Many owners make rekeying part of their standard offboarding checklist for anyone who held a key to a sensitive area.
A change of tenant or a change of ownership is another trigger. A business that takes over a space cannot know how many keys were cut by the previous occupant, the landlord, the contractors or the cleaners. Rekeying on day one is a simple way to start with a known set of keys. See the pages on office building suite rekey and business closing and vacating locks for related situations.
- A key holder with broad access leaves the business
- Keys were lost, stolen or never returned
- A new tenant or new owner takes over a space
- A break-in or attempted break-in occurred
- Many keys have been copied over the years with no record
Keeping a record of who holds keys
Rekeying fixes today's problem. A key record prevents tomorrow's. The idea is simple: a written list that shows which keys exist, who holds each one, when it was issued, and when it was returned. Without that record, a business cannot say with confidence who can enter, and a rekey becomes a guess about the past.
A workable record has a few columns. A key number or stamp, a description of what it opens, the name of the holder, the date issued, the date returned, and a signature or initials at issue. For businesses with many doors, a key cabinet with numbered hooks and a sign-out sheet works well. For a small shop, a single page in a binder is enough.
Stamping keys with a number rather than the business name helps. A key stamped with a name and address tells a finder exactly where to use it. A key stamped with a number tells them nothing. Keep the numbering system and the master list in a secure place, not on the keys themselves.
The record also helps when a locksmith arrives. A technician who can see that eight keys were issued, six are accounted for and two are unknown can recommend a rekey with confidence. A business with no record can only guess, which makes the recommendation less precise. Our page on retail key control policy offers a template for how to think about this, and the guide on key control for property owners adds more.
Remember that a record is only useful if it is kept up to date. Make one person responsible for it, and review it whenever staff changes.
Authorization: who can ask for a rekey
A locksmith cannot rekey a business door simply because someone asks. The person requesting must have the right to authorize the work. For a business that owns its building, that is the owner or an authorized manager. For a tenant, it may be the tenant, though the lease can say that the landlord must approve lock changes or must be given a key.
This is not red tape for its own sake. A locksmith who rekeys a door for the wrong person can cause real harm, locking a legitimate tenant or owner out of their own premises. Verifying authority protects you as much as it protects the property. Expect questions about your role, the lease, and the business name, and expect to be asked to show a document or identification that connects you to the premises.
Many tenants are surprised to learn that their lease requires them to give the landlord a copy of any new key, or to get written permission before changing locks. If you are not sure, check your lease or call your property manager before the visit. It is better to settle this beforehand than to find out at the door that work cannot proceed.
Multi tenant buildings add another layer. A suite door may be your responsibility, while the building entrance, lobby and common areas belong to the landlord or association. A technician can only work on the doors you are entitled to authorize. See the guides on commercial authorization and key records and who decides, owner or tenant for more.
How a commercial rekey visit goes
A typical visit starts with a walk through the doors in question. The technician confirms how many cylinders are involved, what brand and type they are, and whether any are unusual, such as a mortise cylinder on a storefront, a rim cylinder on a back door, or a high security cylinder with a restricted key. Each type has a different procedure, and a good plan avoids surprises.
Next comes the decision about the new key scheme. Does every door need its own key, or should several doors share one key so that staff carry fewer? This is called keying alike. Does the business want a master key that opens everything for the owner while individual staff keys open only certain doors? That is a master key system, explained in the page on master key systems for businesses.
Then the work begins. Cylinders are removed from the doors, disassembled, repinned and reassembled, then tested with the new key. The old key is tested to confirm that it no longer works. Cylinders go back into the doors and each door is tested several times from both sides. A careful technician also checks that the latch and bolt operate smoothly, since a worn latch can be mistaken for a bad rekey.
Afterward you receive the new keys, and the old ones should be collected and destroyed or kept in a sealed envelope. If a key record exists, update it on the spot. Walking away with unlabeled keys and no list is how the next problem begins.
Time depends on the number of doors and their condition. We do not promise a time window, and the technician will tell you what is realistic once they have seen the doors.
Rekeying in different kinds of Miami businesses
The right approach looks different depending on the business. A small restaurant with a front door, a kitchen back door, a dry storage room and an office has a handful of locks, most of which can be keyed alike except the office and the cash area. See the page on restaurant lock needs for the particular problems of kitchens, delivery doors and grease.
A retail shop in a strip plaza usually has a glass front door, a rear service door, perhaps a stockroom, and an office or safe. Staff turnover can be high, so key control matters. A system that gives each employee only the keys they need keeps exposure small.
An office suite may have a single entrance, a few interior doors and a server closet. The property manager may hold a key, and the lease may say how many copies exist. Our page on office building suite rekey goes deeper.
A warehouse or industrial unit in Doral or Medley might have several overhead doors, a personnel door, an office, and a loading dock. Locks there face dust, moisture and rough use, and a rekey is a good time to look at whether the hardware has worn. See warehouse door locks.
A medical or professional office has privacy obligations that make key control more important, since keys can open rooms with records. A property manager handling many units needs a repeatable turnover process, discussed in property management lock turnover.
In each case the rekey itself is the same basic job. What changes is the key plan, the records and the follow through.
Mistakes that undo a rekey
A rekey is only as strong as the habits afterward. The first mistake is leaving old keys in circulation. A drawer full of old keys is a risk. Collect them, count them, and destroy or secure them. Do not assume they are harmless because the locks have changed, since the same keys may fit other doors that were not rekeyed.
The second mistake is making copies at any key counter. If the new key can be duplicated by anyone with a blank, the control you just paid for erodes. Mark keys appropriately, tell staff not to copy them, and consider a restricted system for sensitive doors.
The third is not updating the record. A rekey changes which keys exist, and the old key list is now wrong. Replace it with a new one.
The fourth is skipping a door. Owners often rekey the front but forget the back, the roof hatch, the storage closet or the gate. A thorough walk around with a checklist keeps this from happening. Think about every lock that a former key holder could have reached.
The fifth is ignoring the physical state of the door. If the frame is loose or the latch is worn, a new key does not make the door secure. A short inspection during the rekey visit can spot these issues, and the technician can explain what they see without pushing for extra work.
Avoid these, and a rekey does what you intended. If a situation at your business needs one, call and describe what has happened, how many doors are involved and who held keys. We will explain what is likely, how the visit would go and how pricing is handled by phone.
Questions people ask
How many doors can be rekeyed in one visit?
That depends on the number and condition of the cylinders, and on the key plan you choose. Many small businesses have a handful of doors, and these can often be handled in one visit. Larger sites or those with unusual hardware take longer. The technician reviews the doors first and tells you what is realistic, without promising a particular time window.
Do I have to rekey if an employee returns their key?
Not always. If you have a reliable record that all keys were issued once, returned, and never copied, you may judge the risk to be low. The difficulty is knowing whether a copy was made. For a key to a sensitive area, or if there is any doubt, rekeying is a reasonable precaution. A technician can help you weigh it.
Will new keys work in the old locks?
No. Rekeying changes the cylinder so that only the new key operates it. The old key will no longer turn the lock. Because the lock hardware stays in place, the door looks unchanged. Test every door after the visit to confirm the new key works and the old one does not, and keep or destroy the old keys carefully.
Can I rekey a leased suite without my landlord?
It depends on your lease. Many leases require written permission to change locks, or require that the landlord receive a copy of the new key. A locksmith will ask about your authority before working, and may ask to see a lease or a manager's approval. Check your lease or call your property manager beforehand to avoid delay.
Is rekeying always simpler than replacing locks?
We do not quote prices in writing here, because quotes are given by phone after we understand your doors. Rekeying generally keeps existing hardware, which is often simpler than replacing it. But if a lock is worn or damaged, replacement may be the sensible choice. A technician explains the reasoning for your situation, and the price is stated before work begins.
How do I stop keys from being copied?
A standard key can be copied at almost any key counter. A restricted keyway system uses blanks that are not sold openly, and copies need authorization from the registered owner. This adds control for sensitive doors. It also adds paperwork and planning, so it suits some businesses better than others. A technician can explain how a restricted system would work for you.
Describe the situation by phone and we will tell you what the job involves. Quotes are given by phone. Jobs that cannot be quoted without seeing them need a technician on site, and the service call charge is explained on the phone before anyone is dispatched.
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Written by Claude (AI) (AI) for 24 Hour Locksmith Miami.