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Crenshaw Lock

High Security Locks in Diamond Bar · 24/7 mobile

High Security Locks in Diamond Bar, California

Crenshaw Lock Company installs pick-, bump- and drill-resistant high security locks and restricted keys for Diamond Bar homes and businesses. We are fully mobile and available 24/7, coming to your door with the hardware on board. Call (323) 997-8867 to talk through your property and options.

  • Mobile to your Diamond Bar location
  • Available 24/7
  • Price quoted before we start
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High-security lock cylinder with a dimple key
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A standard builder-grade deadbolt is designed to keep honest people honest. It was never meant to resist someone who knows how to pick, bump or drill a cylinder. High security locks are built differently: tighter tolerances, hardened inserts that defeat drill attacks, security pins that frustrate picking, and keyways that make bump keys useless. Just as important, many use restricted key blanks, so a copy can't be cut at any hardware-store kiosk without your authorization.

Diamond Bar is a hillside suburb built out mostly between the 1960s and 1980s, and a lot of its homes still carry the entry hardware that came with them or was swapped in a decade or two ago. Two-story tract and semi-custom homes with attached garages are everywhere, and many owners now pair a mechanical deadbolt with an electronic or smart lock. Upgrading the cylinder behind that hardware is one of the most practical improvements a homeowner can make, and it is quite different from simply buying a heavier-looking lock.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, led by owner and lead technician David Shar. We are mobile only, with no storefront, so every job happens at your property. That means we look at your actual door, frame, strike and finish before recommending anything, rather than guessing from a catalog.

How it works in Diamond Bar

  1. 1

    Talk through what you need to protect

    Call (323) 997-8867 and tell us about the property: a front door on a tract home, a patio slider, a garage entry, or a commercial suite. We ask about current locks, how many people need keys, and whether any key has been lost or copied. That helps us suggest a realistic level of protection.

  2. 2

    On-site assessment of the door and hardware

    A high security cylinder is only as strong as the door around it. We check the door's thickness, the strike plate, the frame, and the screws holding it all together. Older hillside homes often have thin strike plates or short screws that undermine even a good lock, and we point those out honestly.

  3. 3

    Choose the lock and key system

    We explain the difference between pick-resistant, bump-resistant and drill-resistant features and which products offer which. You also decide whether you want keyed-alike locks for convenience, a restricted keyway so copies need authorization, or a mechanical lock paired with your existing electronic hardware.

  4. 4

    Installation with care for your finish

    We install the new cylinder or complete lock and reinforce the strike and frame where needed. On custom entry doors with delicate finishes, we work to avoid scratching or marring the hardware. Every lock is tested through repeated cycles with the door open and closed.

  5. 5

    Key handoff and walkthrough

    You get your keys, and we show you how the lock should feel when it works properly. We also explain how to order additional keys through the restricted system, so you know what to do when a family member or tenant needs one.

Need high security locks 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 grade and brand of the lock itself, since drill-resistant hardened inserts and restricted keyways cost more to manufacture than standard cylinders.
  • How many locks or cylinders are being upgraded, and whether they are keyed alike so one key works every door.
  • Door and frame condition, including whether the strike plate, reinforcement or door prep needs work to let the new lock perform properly.
  • Whether the lock is for a residential door, a multi-point patio system, or a commercial aluminum-storefront cylinder, which use different hardware.
  • Restricted key blanks and additional key copies, which are controlled and priced differently than ordinary keys.
  • Time of day and the level of urgency, since after-hours emergency work differs from a scheduled upgrade.

Why Diamond Bar chooses us

  • Fully mobile and available 24/7, so upgrades and emergency lock changes happen at your property rather than in a shop.
  • In business since 1987, with owner David Shar leading the work and knowing the older housing stock of the area.
  • We assess the door and frame, not just the cylinder, because a strong lock in a weak door is wasted money.
  • We explain what each security feature actually defends against rather than pushing the most expensive product.
  • Experience with both residential hardware and commercial aluminum-storefront cylinders, including broken-key extraction.
  • Careful handling of high-end finish hardware, which matters on custom homes with designer entry sets.

High Security Locks across Diamond Bar

Diamond Bar's housing varies more than people expect. Along and off Diamond Bar Blvd and Golden Springs Dr, you find 1970s tract homes where the original deadbolt has had decades of use. A worn bolt that sticks or refuses to retract in summer heat is a common sign that the cylinder or latch is due for replacement, and it is a natural moment to move up to a pick- and bump-resistant lock. In neighborhoods like Pathfinder and the Sunset Crossing area, we often see two-story homes with attached garages, where the interior garage door is just as important to secure as the front entry.

The Country Estates is a different situation. This guard-gated enclave of large hillside custom homes has high-end entry hardware, keypad gates, and multi-point patio-door locks. A lockout there can involve both the perimeter gate keypad and the front door, and the finish on custom hardware deserves careful work. High security cylinders and restricted keys suit these properties well, especially in the Summitridge area and other hillside streets where homes sit back from the road. If you are in 91765 or 91789, we come to you.

Commercial needs are more limited here, mostly strip centers and office parks near the SR-57/SR-60 interchange at Grand Ave and around Diamond Hills Plaza. A tenant who snaps a key in an aluminum-storefront lock after hours needs extraction and a new cylinder, and that is a good time to consider a restricted keyway for the suite. Whether you are near the Diamond Bar Center, Sycamore Canyon Park or the Diamond Bar Golf Course, call (323) 997-8867 any hour.

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Other Diamond Bar locksmith services

See all of our Diamond Bar services, or our citywide high security locks page.

High Security Locks in Diamond Bar — FAQs

What makes a lock high security rather than standard?
High security locks use tighter manufacturing tolerances, specialized pins to resist picking, hardened parts to resist drilling, and keyways that frustrate bumping. Many also use restricted keys that cannot be freely copied. Call (323) 997-8867 and we can explain which features fit your door.
Can you work on a gated home in The Country Estates?
Yes. We are fully mobile and have handled situations involving perimeter keypad gates and high-end front-door hardware. We take care to avoid damaging finish hardware. Call (323) 997-8867 and tell us about the property so we can plan the visit.
My deadbolt won't retract in hot weather. Do I need a new lock?
Not always, but it is a warning sign. Heat can expose worn parts, a misaligned strike, or a door that has shifted. We inspect on-site and either rekey, repair or replace. If you want better protection anyway, it is a good time to upgrade.
Will a high security lock work with my smart deadbolt?
Often it can be part of a layered setup. Some owners keep an electronic lock for convenience and use a high security mechanical cylinder on another door, or choose a smart lock with a strong mechanical backup. We can talk through compatibility on-site.
What is a restricted key and why does it matter?
A restricted key blank is controlled by the manufacturer, so copies require authorization. That protects you from a lost, borrowed or previously copied key being duplicated at a kiosk. It is especially useful for rentals, offices and large households.
Can you help if a key breaks in a commercial lock near the SR-57/SR-60 interchange?
Yes. We handle after-hours broken-key extraction in aluminum-storefront locks and can install a replacement cylinder, including a restricted-key option. Call (323) 997-8867 any time, day or night.
Do you have a shop I can visit in Diamond Bar?
No. Crenshaw Lock Company is mobile only, with no storefront. We bring tools and hardware to your property, which also lets us inspect your actual door and frame.
Is the lock enough, or does the door matter too?
The door matters a great deal. A strong cylinder in a thin frame or with short strike screws can still fail. We check the strike, frame and door prep and recommend reinforcement when it would make a real difference.
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