Clear, practical situations where rekeying is worth doing—including a few people often overlook.
Call (408) 877-2177Rekeying doesn't need a special occasion—it needs a specific trigger. If you're not sure whether your situation counts, this list covers the clearest signs, plus a few that get overlooked more often than they should.
If a key is missing and you can't rule out someone finding it and identifying which door it opens, rekey. This is true even if you think the key is "probably" still somewhere in your house—the risk isn't worth the maybe.
You have no reliable way to know how many key copies exist or who's held one over the years. See our full moving-in locksmith checklist for the complete move-in process.
Even if entry wasn't through the door itself, rekeying is a reasonable precaution any time your home's security has been tested or compromised.
Whether the relationship ended well or badly, an ex-roommate or ex-partner having a working key to your current home is worth resolving directly, not assuming they'll simply stop using it.
Dog walkers, cleaners, contractors, or a property manager who's held a key over an extended period are all people you likely won't think to reconsider once the arrangement ends—but the key access doesn't expire on its own.
If you genuinely don't know how many keys exist for a lock—because you inherited the situation, or duplicates were made without a clear record—that uncertainty itself is a reason to rekey. There's no way to check whether a key was copied at most hardware store kiosks.
Anyone who stayed at your home for even a short period, especially through a rental platform, is worth reconsidering—the same logic as a longer-term roommate, just compressed into a shorter window.
Signs like a door unlocked that you're sure you locked, or objects moved slightly, don't necessarily mean anything—but if the feeling persists, rekeying is a low-cost way to remove the uncertainty rather than living with it.
Rekeying changes the internal pin configuration of a lock so that old keys physically stop working, while a newly cut key operates it. It's typically faster and more affordable than replacing the entire lock, as long as the hardware itself is in good condition. If a lock is worn, damaged, or outdated, full replacement may make more sense—a locksmith can tell you which applies to your situation.
Ask yourself: "Could I list every person who currently has a working key to this door?" If the honest answer is no—or you're not fully sure—that's your sign.
Rekeying isn't just for lost keys and new homes—it's for any situation where you can no longer confidently say who has access. The overlooked triggers (ex-roommates, past service providers, unclear duplicate counts) are often the ones that go unaddressed the longest, simply because there's no obvious moment that prompts action.
