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Guide
King Key Locksmith San Francisco

Rekey or change the lock?

They solve different problems. One makes the old keys stop working. The other replaces the hardware on the door. Here is how to tell which you need.

Before we touch the lock, you know what it will cost.

24/7Day, night, weekends
25 to 35 minOur emergency aim in SF
LicensedLIC# 7041 · verify with the State
Since 2019Insured, serving SF
4.9 on Google536 reviews, October 2026

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What each one actually does

Which one you need

A quick way to tell which one fits your door.

Rekey

  • You moved in and do not know who has keys
  • A roommate, a tenant or a contractor had a copy
  • A key was lost, but the lock works fine
  • You want several locks on one key, and they are the same type

Change

  • The lock is worn, sticky or loose
  • Someone forced it or tried to
  • The hardware is too weak for the door, like a cheap lock on a back door
  • You want a different kind of lock, like a deadbolt, a high security cylinder or a smart lock

Which one costs less

Rekeying, in most cases, because the hardware stays where it is and only the inside of the cylinder changes. That is why we ask a few questions about the lock before recommending anything. When a rekey does the job, it is the answer. Before we touch the lock, you know what it will cost.

✓
Rekey from the lock you already have.
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Change when the hardware itself is the problem.
✓
Keyed alike so one key opens every door, either way.
A front door with the deadbolt removed, part way through a lock change

If you just moved in

Rekey the exterior doors on the first day. You cannot know how many copies of the old keys exist, or who has them. If one of the locks also sticks or wobbles, that one is a change, and the others can be rekeyed to match it.

Questions people ask

Is rekeying as secure as a new lock?

For keeping old keys out, yes. A rekeyed lock does not open with any key that existed before. It does not make a weak lock stronger, though.

Which one is cheaper?

Rekeying, in most cases, because the hardware stays on the door.

Can you rekey a lock to match my other locks?

Usually, if the locks are the same type. That way one key opens all of them.

Reach us

One number, answered around the clock, in English, Spanish, Russian and Chinese. Not urgent? Pick the time. Same day, later in the week or on the weekend, whatever works for you.

628-777-2341

Answered day and night, every day of the year.

Email

contact@locksmithkingkey.com

Where we are

1050 Post St, San Francisco, CA 94109

LIC# 7041

California Bureau of Security and Investigative Services.

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