Rekey or Replace Your Locks? How to Decide (2026)
TL;DR - Quick Answer
Rekey locks when the hardware itself is in good working condition and you simply need to invalidate old keys—after a move-in, a lost key, or a breakup with a roommate. Replace locks when the hardware is worn, damaged, outdated, or doesn't match the security level you want (like upgrading to a smart lock or a higher security-grade deadbolt). Rekeying is almost always faster and cheaper than replacement since it reuses your existing lock body and only changes the internal pins. When in doubt, a locksmith can inspect your locks in person and tell you which option actually makes sense for your specific hardware.
What Rekeying Does
Rekeying is a mechanical process where a locksmith opens up the lock cylinder and changes the internal pin configuration so that old keys no longer work, while a new key (or set of keys) does. The lock body, faceplate, strike plate, and overall hardware stay exactly the same—only the pins inside the cylinder and the key that operates them change.
Here's what actually happens during a rekey:
- The locksmith removes the cylinder (the round part where the key inserts) from the door.
- Using a pinning kit specific to the lock brand, they replace the existing pins with a new combination.
- A new key is cut to match the new pin arrangement.
- The cylinder is reassembled and reinstalled, and the old keys are rendered useless.
This process typically takes a matter of minutes per lock once the locksmith has the right tools and pins on hand. It doesn't involve drilling, replacing any visible parts, or altering the appearance of your door hardware. From the outside, a rekeyed lock looks identical to before—the change is entirely internal.
Rekeying is a well-established, low-disruption way to control who has access to a space without the cost or labor of installing new hardware. It's most useful in situations where the physical lock is fine, but you no longer trust or want to track down every key that's out in the world.
When Rekeying Is Right
Rekeying makes sense in a variety of common scenarios, and understanding these can help you decide whether it's the right fit for your situation:
Moving into a new home. Even if you trust the previous owners, you have no way of knowing how many spare keys were made over the years, who has copies, or whether contractors, real estate agents, or neighbors ever had access. Rekeying gives you a clean slate without replacing hardware that's likely still in good shape.
Lost or stolen keys. If a key goes missing and you're worried it could end up in the wrong hands, rekeying is generally the quickest way to neutralize that risk without waiting to see if the key resurfaces.
Ending a relationship with a roommate, tenant, or ex-partner. Anytime someone with a copy of your key no longer should have access, rekeying closes that gap immediately.
After a break-in attempt or suspected tampering. If a lock still functions correctly and shows no structural damage, rekeying may be enough to restore your peace of mind—paired with a broader inspection of the door and frame for damage.
Consolidating multiple keys into one system. If you've accumulated a mismatched set of keys for different doors over time, rekeying can bring them all under a single key.
In each of these cases, the underlying lock hardware is functioning as intended—it's the "who has a key" question that needs solving, not the mechanism itself. A locksmith can typically assess this in a short on-site visit by testing the lock's action, checking for wear, and confirming the cylinder is in serviceable condition.
When Replacement Is Better
Replacement becomes the more sensible option when the lock hardware itself is compromised, outdated, or no longer meets your needs. Signs that point toward replacement rather than rekeying include:
Visible damage or wear. Locks that stick, grind, or resist turning the key smoothly maynot be worth rekeying because the underlying components are degrading. Rekeying only replaces pins, not springs, cylinders, or housing—so a lock with worn internals can develop new problems shortly after a rekey.
Cracked or bent hardware. If a break-in attempt (or repeated wear) has left the strike plate, faceplate, or bolt visibly bent or damaged, rekeying won't fix a structural problem. New hardware is the only real fix.
Mismatched or inconsistent lock brands. Not every lock can be rekeyed to match every other lock. If you're trying to unify several doors under one key and the hardware brands or models are incompatible, replacement (with matching hardware) may be the more practical path.
Wanting a security upgrade. If you're moving from a basic keyed lock to a higher-security-grade deadbolt, a smart lock, or an electronic keypad, that requires new hardware entirely—rekeying doesn't change the lock's security rating or add features.
Very old or obsolete lock models. Some older locks use pins or parts that are difficult to source, making rekeying more expensive or impractical compared to simply installing a modern replacement.
Wanting keyless or smart access. If your goal is to eliminate physical keys altogether in favor of code entry, fingerprint access, or app-based control, this is a hardware swap, not a rekey.
A licensed locksmith can typically tell you within a few minutes of inspection whether a lock is a good rekey candidate or whether the wear and tear (or your goals) point toward full replacement. If you're unsure, it's reasonable to ask for both a rekey quote and a replacement quote so you can compare.
Keyed-Alike Systems
One consideration that often comes up alongside the rekey-vs-replace decision is whether to set up a "keyed-alike" system, where multiple locks on a property all open with the same single key.
Keyed-alike systems are popular for:
- Homeowners who want their front door, back door, and shed or garage to all use one key instead of juggling several.
- Small landlords managing a handful of units who want simpler key management (though many prefer master key systems instead—see below).
- People upgrading multiple locks at once who want convenience without sacrificing security.
There's an important distinction between "keyed-alike" and "master keyed" systems:
- Keyed-alike means every lock uses the identical key—there's no hierarchy. This is often chosen for personal use, like a home with several exterior doors.
- Master keyed means individual locks each have their own unique key, but a separate master key can open all of them. This is more common in rental properties or small offices, where a manager needs universal access while tenants or employees only get access to their own space.
Setting up a keyed-alike system can happen through either rekeying or replacement, depending on the starting hardware:
- If your existing locks are compatible with each other (same brand, similar cylinder type), a locksmith may be able to rekey them all to a shared key combination.
- If your locks are a mismatched assortment of brands and models, replacement with a matching set of keyed-alike hardware is usually necessary.
Keep in mind that keyed-alike systems carry a tradeoff: if one key is lost, every lock in the system is technically compromised, since a single key opens them all. Some homeowners weigh this against the convenience and decide it's worth it; others prefer to keep at least one distinct lock (like a shed or safe) on a separate key.
Cost Comparison
Pricing for both rekeying and replacement varies by job, location, lock brand, and how many locks are involved, so any numbers here should be treated as general, broad ranges rather than a quote. Actual costs depend on the locksmith, the specific hardware, and local market rates.
Rekeying tends to be the more budget-friendly option because it reuses existing hardware and typically involves less labor per lock. As a general rule, rekeying costs less per lock than full replacement, and many locksmiths offer a lower per-lock rate when rekeying several locks in the same visit (like a full house).
Replacement costs more because it includes both the price of new hardware and the labor to install it. The hardware price itself varies enormously:
- Basic mechanical deadbolts sit at the lower end of the price spectrum.
- Mid-range residential deadbolts and knob/lever combinations cost more.
- High-security-grade cylinders, commercial-grade hardware, and smart locks or keypad entry systems sit at the higher end, sometimes substantially so, especially before labor is added.
A few general cost factors to keep in mind regardless of which option you choose:
- Number of locks. Rekeying or replacing multiple locks in one visit is typically more cost-efficient per lock than doing them one at a time on separate visits.
- Lock type and brand. Standard residential locks are generally less expensive to service than commercial-grade or specialty security locks.
- Emergency vs. scheduled service. Same-day or after-hours service calls often carry a premium compared to scheduling during regular business hours.
- Additional hardware needs. If a door frame, strike plate, or other component needs repair alongside the lock work, that adds to the total.
Because pricing varies so widely, it's worth getting quotes from more than one locksmith before committing, and asking specifically whether the quote includes both hardware and labor.
How Long Each Takes
Time is often just as important as cost when deciding between rekeying and replacement, especially if you need access restored quickly.
Rekeying is generally the faster of the two options. Once a locksmith has assessed the lock and has the correct pins on hand, the actual rekeying process for a single lock often takes well under half an hour. A typical home with several exterior doors can usually be rekeyed in a single visit lasting somewhere in the range of thirty minutes to about an hour, depending on the number of locks and their condition.
Replacement takes longer because it involves more steps:
- Removing the old lock hardware entirely.
- Fitting new hardware to the existing door prep (the holes and cutouts in the door), which sometimes requires adjustment if the new lock's dimensions differ slightly from the old one.
- Installing and testing the new lock, including cutting new keys.
A single lock replacement can often be completed in a similar timeframe to a rekey once the locksmith is on-site with the correct hardware, but multiple lock replacements, or replacements requiring door modification, will extend the visit. Smart locks and electronic keypad systems may also require additional time for programming and testing.
Neither process has a guaranteed completion time, since every door, lock condition, and property setup is different. If timing matters to you, it's reasonable to ask a locksmith directly how long they expect the job to take before scheduling, based on their assessment of your specific locks.
FAQ
Is rekeying as secure as replacing a lock?
Rekeying can be just as secure as replacement if the existing lock hardware is in good condition and matches your desired security level. Security comes primarily from the lock's grade and design, not from whether it's the original cylinder or a new one. However, if you want to upgrade to a higher security grade or add features like smart access, replacement is the only way to get that.
Can any lock be rekeyed?
Most standard residential and commercial pin-tumbler locks can be rekeyed, but not all locks are rekeyable, and compatibility depends on the brand and design. Some very basic or low-cost locks, and some smart locks, may not support rekeying at all. A locksmith can confirm whether your specific lock is a rekey candidate.
How do I know if my lock needs replacing instead of rekeying?
Signs pointing toward replacement include visible damage, a sticky or hard-to-turn mechanism, a cracked or bent strike plate, or a desire for higher security or smart features. If the lock operates smoothly and shows no wear, it's often a good rekey candidate. A locksmith's in-person inspection is the most reliable way to know for sure.
Is it cheaper to rekey or replace locks?
Rekeying is generally less expensive than replacement because it reuses your existing hardware and typically requires less labor. Replacement costs more since it includes new hardware plus installation. That said, exact pricing varies by job, lock brand, and location, so it's worth getting a quote for both options before deciding.
Can I rekey all my locks to use the same key?
Yes, this is called a keyed-alike system, and it's possible if your locks are compatible with each other, often locks from the same brand or cylinder type. If your locks are a mix of incompatible brands, you may need to replace them with a matching keyed-alike set instead.
How long does it take to rekey a house full of locks?
For a typical home with several exterior doors, rekeying often takes somewhere in the range of thirty minutes to about an hour in a single visit, though this depends on the number of locks and their condition. A locksmith can give you a more specific estimate after assessing your doors.
Should I rekey or replace locks when I move into a new house?
Many people choose to rekey when moving in, since it's a faster and lower-cost way to make sure old keys no longer work. Replacement is worth considering instead if the existing locks are worn, outdated, or don't meet the security level you want going forward.
Does rekeying work on smart locks?
Rekeying, in the traditional mechanical sense, generally applies to physical pin-tumbler locks rather than most smart locks, which use electronic codes, apps, or key fobs instead of physical key changes. For smart locks, "changing access" typically means resetting codes or removing user credentials rather than rekeying a cylinder. Check with the manufacturer or a locksmith familiar with your specific smart lock model for guidance.
Last updated: August 2026