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Overview
Rekeying a lock means changing the internal tumblers (pins) so old keys no longer work while keeping the existing lock hardware in place.
This is a common, cost-effective way to regain control over who can enter your home after someone moves out, loses a key, or after contractors or service workers have had access.
Key takeaways
- Rekeying replaces the lock’s internal pins and gives you new keys without replacing the entire lock.
- Rekey after tenant or roommate changes, lost or stolen keys, or major work by contractors.
- A locksmith can rekey quickly, but many homeowners can rekey with the right kit and instructions.
How it works
A locksmith or a homeowner with a rekey kit removes the lock cylinder, swaps the pin stack to match a new key, and then reassembles the cylinder so it accepts only the new key.
Many locks use standard pin-and-tumbler mechanisms, so a single locksmith visit can rekey multiple locks to the same key, creating a master keying arrangement for convenience.
Rekeying typically takes less time and costs less than buying and installing new locksets, and it preserves any decorative or keyed hardware you prefer to keep.
What it may cover (and what it may not)
Rekeying covers the internal mechanism so previously issued keys no longer operate the lock, restoring exclusive access to new keyholders.
Rekeying does not change the lock’s external condition, upgrade the lock’s resistance to forced entry, or address damaged or worn hardware; for those issues you may need repair or full replacement.
If you need higher security—such as bump-resistant cylinders, smart locks, or reinforced strike plates—rekeying alone will not provide those upgrades.
Common mistakes to avoid
Delaying rekeying after a tenant, roommate, or employee change can leave you vulnerable if old keys are still in circulation.
Assuming a trusted contractor returned a key is risky; always rekey or verify key control after outside workers have accessed your home.
Trying to rekey unfamiliar or high-security locks without the right tools or instructions can damage the cylinder; when in doubt, hire a licensed locksmith.
Questions to ask an agent
Ask whether your homeowners or renters insurance has any requirements or recommendations about lock changes after a loss or tenant turnover, and whether changing locks affects any covered claim conditions.
Ask a locksmith about warranty, whether the new keying can match other locks in your home, and whether upgraded cylinders are recommended for your door type.
If you want help arranging services, consider contacting an insurance representative or talk to an agent who can advise on security steps that align with your policy.
Next steps
Decide whether you will rekey yourself with a recognized kit or hire a licensed locksmith; get at least two estimates if you plan to hire out the work.
Inventory which doors and exterior locks need new keys, and consider standardizing keying so one key works multiple doors if that fits your security needs.
After rekeying, document who has the new keys and update any tenancy agreements or house rules about key distribution to avoid future confusion.
Frequently Asked Questions
How long does rekeying take?
Most standard residential locks can be rekeyed in 10–30 minutes per lock by a locksmith; doing multiple locks or unusual hardware may take longer.
Can I rekey the locks myself?
Yes—many homeowners can rekey simple pin-and-tumbler locks with a purchased rekey kit, but complex or high-security locks are best handled by a professional.
Is rekeying cheaper than replacing the lock?
Generally, rekeying is less expensive than buying and installing new locksets, especially if your existing hardware is in good condition.
Will rekeying improve my home’s security?
Rekeying improves control over who has keys but does not harden the door against forced entry; consider additional upgrades for enhanced physical security.