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(323) 997-8867
Crenshaw Lock

Key Duplication in Diamond Bar · 24/7 mobile

Key Duplication in Diamond Bar, California

Crenshaw Lock Company provides mobile key duplication in Diamond Bar, California, cutting house, office, mailbox and restricted keys right at your door. We are available 24/7, with no storefront visit needed. Call (323) 997-8867 to talk through what key you need copied and where you are.

  • Mobile to your Diamond Bar location
  • Available 24/7
  • Price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
Key cutting machine duplicating a brass key
Open now(323) 997-8867

Most people think of key duplication as a quick trip to a hardware counter. In Diamond Bar, that trip often means a drive down Diamond Bar Blvd or Golden Springs Dr with a single key you cannot afford to lose. Crenshaw Lock Company removes that step. We are fully mobile, so we bring the cutting equipment to your home, office or gated property and make the copy while you wait.

This matters in a hillside suburb like Diamond Bar, where many homes were built from the 1960s through the 1980s and have been re-keyed, patched or upgraded over the decades. A worn original key can produce a poor copy, and a poor copy can make a tired deadbolt even harder to turn. Having a technician look at the key and the lock together lets us catch that problem before it leaves you stuck at the door.

Crenshaw Lock has served Greater Los Angeles and Ventura County since 1987, under owner and lead technician David Shar. We handle ordinary house keys, office keys, mailbox keys and restricted keyways, and we can tell you plainly when a key can be copied on the spot and when a different approach makes more sense.

How it works in Diamond Bar

  1. 1

    You call and describe the key

    Call (323) 997-8867 any time and tell us what you need copied: a front-door key, a garage-entry key, a mailbox key, an office key or something stamped as restricted. We will ask about the lock brand if you know it and where in Diamond Bar you are.

  2. 2

    We come to you

    Because we are fully mobile, there is no shop to visit. A technician drives to your home, office suite or gated property with the cutting equipment and blanks needed for the job.

  3. 3

    We inspect the original key and lock

    Before cutting, we check the key for wear, bends or a previous bad copy. We also test how the lock operates. If a deadbolt is sticking or dragging, we tell you now, since a new copy will not fix it.

  4. 4

    We cut and test the copy

    The key is cut on site and then tried in the actual lock, not just compared by eye. We adjust until it turns smoothly, and we repeat the check for every copy you order.

  5. 5

    Restricted and special keys are handled carefully

    Restricted keyways are controlled for a reason. We will explain what authorization or alternate options may be involved, and we will not bypass the protection that your building or property manager has put in place.

  6. 6

    We review options before leaving

    If the lock is worn, or if too many unknown copies exist, we may suggest rekeying so that only your new keys work. The decision is yours, and we explain the tradeoffs without pressure.

Need key duplication in Diamond Bar?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

What affects the price

  • The type of key: a standard house key is a different job from a high-security, restricted or specialty-keyway key.
  • How many copies you need, and whether they are all for one lock or several.
  • The condition of the original key, since a worn or damaged key may need extra work to produce a copy that functions well.
  • Whether the lock itself needs attention, such as rekeying or replacement, in addition to making copies.
  • The time of day and the exact location of the service call, since we operate 24/7 and travel to you.
  • Any authorization or documentation required for restricted keys, which can affect how the job is done.

Why Diamond Bar chooses us

  • Fully mobile service: we cut keys at your door, so you do not need to leave a property unsecured or drive anywhere.
  • In business since 1987, with owner David Shar leading the work.
  • We test every copy in the lock it is meant for, rather than assuming a match.
  • We are honest about restricted keys and will not skip the controls that protect your property.
  • We can look at the lock as well as the key, which helps in older tract homes where deadbolts have seen decades of use.
  • Available 24/7, so a lost or broken key does not have to wait for business hours.

Key Duplication across Diamond Bar

Diamond Bar is a hillside community, and its housing reflects that. Many two-story tract and semi-custom homes from the 1960s through the 1980s, in areas like Pathfinder and the Sunset Crossing area, still rely on original deadbolts and garage-entry locks. In summer heat, a worn deadbolt can stick or fail to retract, and a fresh copy of an old key is not always the right fix. We can duplicate on site and tell you if rekeying or replacement makes more sense.

In The Country Estates, the guard-gated enclave of large hillside custom homes, entry hardware tends to be higher end, with keypad gates and multi-point patio-door locks. Copying keys for these properties takes care, and we work to avoid marring finish hardware. The same goes for the Summitridge area, where hillside homes often have several exterior doors that each need matching keys.

We serve ZIP codes 91765 and 91789, from homes near Diamond Bar Center and Sycamore Canyon Park to strip centers and office suites around Diamond Hills Plaza and the SR-57/SR-60 interchange at Grand Avenue. Offices there often need extra keys for staff, cleaners or property managers, and we can do that after hours. Call (323) 997-8867 and we will come to you.

Locked out or need a locksmith now?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

Other Diamond Bar locksmith services

See all of our Diamond Bar services, or our citywide key duplication page.

Key Duplication in Diamond Bar — FAQs

Can you duplicate a key at my home in Diamond Bar?
Yes. We are fully mobile and cut keys on location, so you do not need to visit a store. Call (323) 997-8867 and tell us what kind of key you have.
Do you have a shop I can visit?
No. Crenshaw Lock Company is mobile only. A technician comes to your home, office or property with the equipment needed.
Can you copy a key marked 'Do Not Duplicate'?
That marking is not always a true restriction, but restricted keyways are different. We will explain what is possible for your key and will not bypass real security controls. Call (323) 997-8867 to discuss your situation.
Can you make copies for a gated property in The Country Estates?
Yes, we service gated hillside homes. Let us know about the gate or keypad when you call so we can plan access, and we take care around high-end entry hardware.
My old deadbolt is hard to turn. Will a new copy help?
Not always. If the lock is worn, a new key may still stick. We check the lock when we cut the copy and can recommend rekeying or replacement if needed.
Can you copy mailbox keys?
Yes, we can cut many mailbox keys on site. Some cluster boxes are controlled by the postal service or property management, so we may need to go through the proper channel.
Do you handle office keys near the SR-57/SR-60 interchange?
Yes. We duplicate office and commercial keys, including after hours, and can also help with broken keys or cylinder replacement. Call (323) 997-8867.
Are you available at night or on weekends?
Yes, we operate 24/7. We do not promise specific arrival times, but you can call (323) 997-8867 at any hour.
DS

Reviewed by David Shar — Owner & Lead Technician

Crenshaw Lock Company has served Greater Los Angeles & Ventura County since 1987.

Last updated 2026-10-12.

Call (323) 997-8867 · Open 24/7