A decision guide for a worn or compromised lock

What rekeying actually does

A standard pin tumbler lock opens when the cuts on a key lift a set of small pins to exactly the right height. Rekeying changes those internal pins so the lock accepts a different key. The old key no longer works, the new key does, and the lock body, the handle and the deadbolt stay where they are. From the outside nothing looks different.

This makes rekeying a good answer to a question about who has access, not about the lock's condition. If you moved into a home and do not know who holds copies of the old keys, a rekey cuts off all of them at once. If a former roommate or caregiver kept a key, a rekey ends their ability to use it. If you want several locks on a property to share one key, rekeying them to match is a common approach.

Rekeying does not fix a lock that is broken, worn or weak. If the lock sticks because the internal parts are damaged, a new set of pins will not cure that. If the lock is of a basic grade and you want stronger protection, rekeying keeps the same grade. It changes the key, not the strength of the hardware. The next sections explain when that distinction matters.

What replacing a lock does

Replacement means removing the existing lock hardware and installing new hardware. That might be a new deadbolt, a new handle set, a new cylinder or a new electronic lock. Replacement changes both who can open the door, because the new lock comes with new keys or codes, and what the lock is made of, because you choose the grade, finish and features.

Replacement is the right tool when the hardware itself is the problem. A lock that is corroded, loose, damaged by a break-in attempt or simply worn out should be replaced, because new pins in a failing body only delay the failure. It is also the right tool when you want a different kind of lock, such as a higher security grade, a keypad or a smart lock.

Replacement takes more time and usually costs more than rekeying, because it involves new hardware and more work at the door. The price depends on the hardware you choose, which is why quotes are given by phone after a conversation and why bigger projects need an on-site visit first. See our guide on service call charges and phone quotes for how that works.

Questions that point toward rekeying

Rekeying fits when the hardware is sound and the issue is access. Ask yourself whether the lock works smoothly, turns without force and holds firmly in the door. Ask whether it is a decent grade that you are happy with and whether it matches the style you want. If the answers are yes, the lock is a good candidate for a rekey.

Typical rekey situations include moving into a new home, losing a key, ending a tenancy, parting ways with a roommate or caregiver, or wanting one key for several doors. Landlords and property managers often rekey between tenants because it is a quick way to reset access without replacing hardware. Businesses rekey after staff changes for the same reason.

Rekeying also makes sense when you want to keep the look of your hardware. Decorative handle sets, matching finishes and historic hardware can be expensive or hard to replace. A rekey changes how the lock works without altering how it looks. Our page on rekeying after moving in describes the usual new-home case.

• You do not know who holds copies of the old keys.
• A key was lost, stolen or kept by someone who should not have it.
• The lock works smoothly and is in good condition.
• You want several doors to share one key.
• You want to keep the current look of the hardware.

Questions that point toward replacing

Replacement fits when the lock itself is failing or inadequate. Check whether the key turns stiffly, sticks or needs jiggling. Look for corrosion, loose mounting screws, a handle that wobbles or a bolt that does not extend fully. Salt air and humidity in South Florida wear down hardware faster than many owners expect, and exterior locks near the coast are especially exposed.

Think about the lock's role and grade. A basic builder-grade lock on a front door may be adequate for a time, but if you want stronger resistance, a better-grade deadbolt or a reinforced strike plate makes more difference than new pins. Our guides on lock grades and deadbolt types explain the differences.

Replace as well when you want a different function. A keypad, a smart lock or a handle set with a different finish is a replacement job. The same is true after a break-in attempt, when the lock or door may have been weakened in ways that are not obvious. In those cases a technician should look at the lock and the frame, not just change the key. See our page on lock repair after a break-in.

• The key turns stiffly, sticks or needs jiggling.
• The lock is corroded, loose or visibly damaged.
• There has been a break-in attempt.
• You want a stronger grade or a different function.
• The hardware is old, mismatched or unavailable for repair.

A side-by-side comparison

It can help to see the two options next to each other. The table summarizes the main differences. Treat it as a guide to the questions to ask, not as a rule, because every door and lock is different, and a technician who sees your hardware may point to a different answer than the one you expected.

The common thread is the purpose. If the purpose is to control who has keys, rekeying usually answers the question. If the purpose is to improve the hardware, replacement does. When both apply, such as a worn lock after a move, you may choose to replace and receive new keys in one step, which solves both problems at once.

Condition checks you can do yourself

Before the call, take a few minutes to observe the lock without taking anything apart. Turn the key in the lock several times. Does it move smoothly or does it catch? Does the bolt slide fully into the frame without a push on the door? Does the handle feel tight on the door or does it move? These small observations help the technician judge the condition and speed up the conversation.

Check the door and frame too. If the door scrapes the frame, the bolt may not line up with the strike plate, which makes the lock feel stiff even though the lock is fine. A misaligned door is a frequent cause of complaints that look like lock problems. A technician can often fix that with an adjustment instead of replacing anything. See repair or replace door hardware for how to tell the difference.

Do not take the lock apart yourself or force a stuck key, and do not use heavy oil that can gum up the pins. If a key breaks or the lock will not turn, stop and call. Forcing it can turn a small repair into a larger one. Never attempt to defeat a lock to test it. Describe what you saw to the dispatcher, and let a technician make the call.

• Does the key turn smoothly or does it catch?
• Does the bolt extend fully without pushing on the door?
• Is the handle or knob firmly attached to the door?
• Does the door scrape or rub the frame?

Rented homes, condos and shared buildings: tenants, associations and shared buildings

If you rent, check with your landlord or management before changing or rekeying a lock. Local rules and lease terms vary, and a landlord may need to approve the work or hold a key. Our guide on owner versus tenant authority explains common patterns. Written approval can save a technician and you from a dispute.

In a condominium or an association-run building, the rules may specify which locks and keys are allowed on unit entry doors, and the association may keep a master or emergency key. Rekeying is often easier to approve than replacing because the appearance and grade stay the same, but you should still check. Our guide on condo door hardware rules covers this.

In a shared household, think about who should hold new keys and who has authority to decide. After a separation, an immediate lock change is a common request, and a technician will need to confirm that the person asking has the right to make it. Be ready with documents. See why authorization is needed.

How a technician helps you decide

The simplest way to choose is to describe the situation on the phone. Say what happened, such as a lost key, a move or a worn lock. Describe what the lock does when you use it. Mention the type of door and whether the lock is a deadbolt, a handle set or both. The dispatcher can tell you which option is likely to fit and whether a visit is needed.

If the technician arrives and finds the lock in poor shape, they should explain why and propose replacement. If they find it in good shape, they may suggest a rekey, which is less work and keeps the hardware you have. A good technician explains the tradeoffs and lets you choose. Be cautious of a provider who recommends replacement for every call or rekeying for everything without looking.

Remember that quotes are given by phone for straightforward work, that complicated jobs need an on-site visit first, and that a service call charge is explained before dispatch. When you are ready to settle on a rekey or a replacement, call and describe your situation. The dispatcher will help you work out which option fits and what happens next.

Example situations and how each might go

A family buys a house built decades ago and receives three keys from the seller, with no certainty about how many others exist. The front deadbolt turns smoothly and the handle set is firm. Here a rekey is a natural fit: it makes every old key useless, keeps the hardware the family already likes and gives them a fresh set. If the family later wants a keypad, that becomes a separate replacement decision.

A landlord turns over an apartment between tenants. The locks are in decent shape, but the prior tenant has keys. Rekeying the entry lock resets access without buying new hardware, and the landlord can document the change. If the unit's lock is corroded from years of salt air near the water, though, the landlord may choose to replace it while the unit is empty, because a lock that sticks produces complaints later.

A homeowner discovers that the deadbolt on the back door spins freely or the bolt barely extends after someone pushed on the door in the night. Rekeying would change nothing here, because the problem is damage. The door, strike plate and frame need to be inspected, and the lock likely needs replacement along with any frame repair. Treating that as a key problem would leave the door weak.

A small business owner lets an employee go and wants to be sure that the former employee cannot enter. A rekey of the entry and storage locks is a direct answer. If the business has a master key system, the technician may suggest rekeying the affected cylinders and issuing new keys to the right people, which is a more involved job and may require an on-site visit before a quote.

Questions people ask

Related pages

Written by Claude (AI) (AI) for 24 Hour Locksmith Miami.