Rekey or Replace Your Locks? How to Decide (Sacramento, 2026)
TL;DR - Quick Answer
Rekeying changes the internal pins in your existing lock so old keys no longer work, while replacement swaps the entire hardware. Rekeying is usually the faster, more affordable choice when your locks are in good working condition and you just need new keys — after a move, a lost key, or a roommate change. Replacement makes more sense when the hardware is old, damaged, mismatched, or you want to upgrade to a different lock type or brand. Many Sacramento homeowners end up doing a mix: rekeying the locks that are fine and replacing the ones that aren't.
What Rekeying Does
Rekeying is a mechanical adjustment made to the lock you already have. Inside every pin-and-tumbler lock (the kind on most Sacramento homes) is a set of small pins cut to match one specific key shape. Rekeying involves opening the lock cylinder, removing the existing pins, and replacing them with a new set that only responds to a new key. The exterior housing, the deadbolt mechanism, the strike plate, and the door hardware itself all stay exactly the same — only the internal pin combination changes.
Because the hardware isn't being removed or replaced, rekeying doesn't require drilling new holes, refinishing the door, or matching new hardware to your existing door prep. It's a targeted fix aimed at one specific problem: making sure that whoever holds the old key can no longer get in, while whoever holds the new key can.
This is why rekeying is often described as "changing who has access" rather than "changing the lock." If your locks are functioning smoothly — the deadbolt throws easily, the key turns without sticking, there's no visible damage — rekeying lets you address a security concern without touching anything else about the door.
Most residential deadbolts and knob locks from major manufacturers are designed to be rekeyed, and a locksmith carries pin kits sized for the common brands found in Sacramento-area homes. It's a routine service, not a specialty repair, which is part of why it tends to be quick.
When Rekeying Is Right
Rekeying tends to be the better fit in situations where the lock hardware itself isn't the problem — access to the existing key is. Common scenarios include:
- You just moved into a home. You have no way of knowing how many keys exist for the previous owners, contractors, or agents who may have had access. Rekeying every exterior lock is a standard step after closing on a house, and it doesn't require you to guess at what hardware was installed.
- A key was lost or possibly stolen. If a keyring went missing and you're not sure where it ended up, rekeying eliminates the risk without needing to identify or track down the lost key.
- A roommate, tenant, or family member moved out. Rather than asking someone to hand back every copy they may have made, rekeying invalidates all existing keys at once.
- You want to consolidate keys. If your front door, back door, and side entry all use different keys, a locksmith can often rekey them to a single key (more on this below).
- The locks are in good shape but you're not sure who has copies. Over time, keys get copied for dog walkers, house sitters, or contractors. If you've lost track of how many are out there, rekeying resets the count to zero without new hardware.
In all of these cases, the underlying mechanism is sound — it just needs a new combination. That's the core condition that makes rekeying the more sensible option: functional hardware, an access concern.
When Replacement Is Better
Replacement becomes the more practical route when the lock itself has a problem that rekeying can't solve. Signs it may be time to replace rather than rekey include:
- Visible wear or damage. A deadbolt that sticks, a key that's hard to turn, a cylinder that wobbles, or a strike plate that no longer aligns properly are mechanical issues. Rekeying won't fix worn-out internal components.
- Attempted break-in or forced entry. If a door was kicked in, pried, or shows signs of an attempted bump or pick, the lock's structural integrity may be compromised even if it still technically functions. Damaged hardware is generally best replaced.
- Outdated or low-security hardware. Some older locks lack features like anti-pick pins or reinforced strike plates. If you're looking to upgrade your home's security level rather than just its key, replacement is the way to add those features.
- Mismatched or inconsistent hardware. Homes that have had doors or hardware replaced piecemeal over the years sometimes end up with a mix of brands and lock types that can't be rekeyed to work together. Replacement lets you standardize.
- You want smart or keyless functionality. Rekeying only works on traditional pin-and-tumbler cylinders. If you're switching to a keypad, smart lock, or fingerprint entry, that's a hardware replacement, not a rekey.
- The lock is very old. Aging hardware can become brittle or develop worn pin chambers that don't hold a fresh rekey well. In these cases, a locksmith may recommend replacement simply because the existing lock isn't a reliable long-term host for new pins.
A good rule of thumb: if the problem is "who has a key," rekey. If the problem is "the lock itself," replace it.
Keyed-Alike Systems
One of the most common questions homeowners ask is whether all their doors can use the same key. The answer is usually yes, through a process called "keying alike." This means multiple locks — say, the front door, back door, and garage entry — are all rekeyed (or newly installed) to accept the identical key, rather than each needing its own separate key.
Keyed-alike systems are popular for a few practical reasons:
- Fewer keys to carry. Instead of testing three or four keys at the door in the dark, one key opens everything.
- Simpler to manage for a household. Parents, kids, or roommates only need one key copied, not several.
- Convenient during a move-in. If your new home has different brands or styles of locks on different doors, a locksmith can often still key them alike even if the hardware doesn't match, as long as the cylinders are compatible with a shared pinning.
It's worth noting the trade-off: a keyed-alike system means a single lost key affects every door it opens, not just one. Some households prefer to keep exterior doors keyed alike for convenience, while keeping a shed, gate, or secondary structure on a separate key. This is a reasonable middle ground and worth mentioning when you're discussing options with your locksmith.
Keying alike can typically be done whether you're rekeying existing hardware or installing new locks, so it's a decision that applies to either path.
Cost Comparison
Costs for both rekeying and replacement vary by job, and the range depends on factors like the number of locks, the brand and style of hardware, and whether any additional work (like fixing a misaligned strike plate) is needed along the way. As a broad general guideline for Sacramento-area homes:
- Rekeying tends to be the lower-cost option per lock since it doesn't involve new hardware — you're paying primarily for labor and pins. Rekeying multiple locks to be keyed alike in the same visit is often more economical per-lock than rekeying them individually.
- Replacement costs more per lock because it includes the price of new hardware in addition to labor, and pricing shifts depending on whether you choose a basic deadbolt, a higher-security cylinder, or a smart/keyless lock.
- Mixed jobs — rekeying some doors and replacing others — are common and priced based on the specific combination of work involved.
Because pricing depends heavily on your specific hardware, door count, and any complications discovered once a locksmith looks at the door, it's best to treat any number you see online as a rough starting point rather than a quote. Asking for an on-site or photo-based estimate before work begins is the most reliable way to know what a specific job will cost.
How Long Each Takes
Timing is another area where rekeying and replacement differ noticeably.
Rekeying is generally the quicker service. Because the door, frame, and hardware housing stay untouched, a locksmith is only working with the internal cylinder. A single lock can often be rekeyed in a short amount of time, and a full set of exterior doors on a typical Sacramento home can usually be completed in one visit.
Replacement takes longer because it involves removing the old hardware entirely, confirming the new lock fits the existing door prep (or adjusting it if it doesn't), installing the new mechanism, and testing that the deadbolt throws smoothly and aligns with the strike plate. If the new hardware isn't a perfect match for the existing holes, minor adjustments can add time. Replacing multiple locks, or adding features like a smart lock that requires batteries and setup, will generally take longer than a straightforward swap of a single deadbolt.
In both cases, the exact time needed depends on the condition of the door, the specific hardware involved, and whether any complications come up once work is underway — so it's best to think in terms of a general visit rather than a fixed appointment length.
FAQ
Can all my locks be rekeyed to use one key even if they're different brands?
Often, yes — many residential lock brands use compatible pin systems that allow a locksmith to key them alike even when the hardware itself looks different. However, some lock types or older mechanisms aren't compatible with this process. A locksmith can check your specific hardware and let you know whether keying alike is possible for your doors.
Is rekeying as secure as replacing the lock?
Rekeying restores the same level of security the lock originally had — it invalidates old keys but doesn't change what the lock is capable of. If your current hardware already meets your security needs and isn't damaged, rekeying keeps that same protection with a new key. If you want to increase your security level beyond what the current lock offers, replacement with upgraded hardware is the better route.
How do I know if my lock is too old to rekey?
Signs include a key that's difficult to turn, a cylinder that feels loose or wobbly, visible rust or corrosion, or a deadbolt that doesn't fully extend. A locksmith can inspect the lock and tell you whether it's a good candidate for rekeying or whether the wear suggests replacement instead.
Should I rekey after buying a home in the Sacramento area?
Many new homeowners choose to rekey shortly after closing, since there's no reliable way to know how many keys exist from previous owners, agents, or contractors. Rekeying resets access without requiring you to identify or collect old keys.
Can I rekey a smart lock or keypad lock?
Traditional rekeying applies to pin-and-tumbler mechanisms and doesn't apply the same way to smart locks or keypad entries, which typically use codes or electronic credentials instead of cut keys. If you want to change access on a smart lock, that usually involves resetting codes or reprogramming rather than a mechanical rekey.
What's the difference between rekeying and just changing the locks?
Rekeying keeps your existing lock hardware and only changes the internal pins so old keys stop working. "Changing the locks" usually refers to full replacement — removing the old hardware and installing new locks entirely, which is a more involved job.
Do I need to rekey every door, or just the front door?
It depends on your goals. If your concern is a specific lost key or a former occupant, it's worth rekeying every exterior door that key could have opened. If you're only addressing one specific lock, rekeying just that door may be enough — a locksmith can help you think through which doors are relevant to your situation.
How much does it typically cost to rekey versus replace a lock in Sacramento?
Costs vary by job depending on the number of locks, the hardware involved, and any additional adjustments needed, so it's hard to give a precise number without seeing the specific doors. In general, rekeying tends to cost less per lock than replacement since it doesn't include new hardware, but the best way to get an accurate sense of cost is to request an estimate for your specific situation.
Last updated: August 2026.