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(323) 997-8867
Crenshaw Lock

Lock Replacement in Diamond Bar · 24/7 mobile

Lock Replacement in Diamond Bar, California

Crenshaw Lock Company provides mobile lock replacement in Diamond Bar, California, 24/7. We come to your home or office, remove worn, damaged or outdated hardware, and install new locks keyed to your needs. Call (323) 997-8867 to talk through your door and get started.

  • 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
New matte black lock set beside an old worn brass lock
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A lock rarely fails at a convenient time. In Diamond Bar, it tends to happen when a deadbolt that has turned thousands of times finally sticks on a hot afternoon, or when a key snaps as you head out. Lock replacement means swapping the failing hardware for a new lock that fits your door, your household and the way you actually use the entry.

Much of Diamond Bar was built out between the 1960s and 1980s, so many homes still carry original or mid-life hardware: older deadbolts, worn strike plates, and garage-to-house doors that have seen decades of use. At the same time, more homeowners are moving to electronic and smart deadbolts. We handle both worlds, from a plain keyed deadbolt to a keypad or app-connected lock.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, led by owner and lead tech David Shar. We are fully mobile, with no storefront to visit. We bring the tools and hardware to you, whether you are in a tract home, a hillside custom property or a small office suite.

How it works in Diamond Bar

  1. 1

    Tell us what is happening

    Call (323) 997-8867 and describe the problem: a sticking deadbolt, a lost key, a break-in, or a wish to upgrade. Tell us the type of door and whether it is a front door, patio door, garage entry or office door.

  2. 2

    We come to you

    Because we are fully mobile and available 24/7, we travel to your Diamond Bar address with tools and a range of hardware. There is no shop visit, and we can work during evenings, weekends and overnight.

  3. 3

    Inspect the door and existing lock

    We check the lock, the latch, the strike plate and the door itself. Sometimes the lock is not the real problem. Warped framing or a misaligned strike can make a good lock feel broken, and we will tell you honestly which it is.

  4. 4

    Choose the right replacement

    We walk through options that fit your needs: standard keyed deadbolts, higher-security cylinders, keypad or smart locks, or rekeying if your existing hardware is still sound. You decide what suits your household and budget.

  5. 5

    Install and fit carefully

    We remove the old hardware and install the new lock, taking care with finishes, especially on custom or high-end doors. We adjust the latch and strike so the bolt throws smoothly and fully.

  6. 6

    Test and hand over keys

    We operate the lock repeatedly, confirm every key works, and show you how any electronic features are programmed. You leave with a door that locks and unlocks the way it should.

Need lock replacement 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 lock: a basic keyed deadbolt, a high-security cylinder, and a smart or keypad lock differ considerably in hardware cost.
  • How many locks need replacing, and whether you want them all keyed alike so one key works every door.
  • Door condition and compatibility, such as older bores that need adjustment, misaligned strike plates, or specialty doors like multi-point patio locks.
  • Commercial or aluminum-storefront cylinders, which use different hardware than typical residential locks.
  • Time of day and urgency, since after-hours and emergency calls involve different scheduling than planned upgrades.
  • Extra work such as key extraction, damage repair after a break-in, or programming electronic features.

Why Diamond Bar chooses us

  • Serving Greater Los Angeles and Ventura County since 1987, so we have seen the lock problems that come with decades-old homes.
  • Fully mobile and available 24/7, with the work done at your door rather than at a counter.
  • We tell you honestly whether you need a replacement, a rekey or just an adjustment, instead of selling hardware you do not need.
  • Experience with both traditional hardware and electronic or smart deadbolts, which are increasingly common in Diamond Bar homes.
  • Careful handling of finish hardware on high-end entry doors, where scratches and mismatched fittings show.
  • Residential and small commercial capability, from tract-home deadbolts to office-suite cylinders.

Lock Replacement across Diamond Bar

Diamond Bar is a hillside suburb, and its housing shapes the lock work we do. Two-story tract and semi-custom homes with attached garages fill neighborhoods like Pathfinder, the Sunset Crossing area and the Summitridge area, many dating from the 1960s through the 1980s. A family in a 1970s home off Diamond Bar Blvd may find an original deadbolt that no longer retracts in summer heat. That is a classic case for on-site replacement or rekey, and it is often a quick fix at the door in ZIP 91765.

The Country Estates is a different kind of job. This guard-gated enclave of large hillside custom homes often has high-end entry hardware, keypad gates and multi-point patio-door locks. Replacing a lock there calls for care with finishes and an understanding of how the gate and door hardware work together. Homes in ZIP 91789 and across the city also increasingly use electronic deadbolts, which we install and program.

Commercial needs are more limited, mostly strip centers and office parks near the SR-57/SR-60 interchange at Grand Avenue. If a key breaks in an aluminum-storefront lock after hours, we can extract it and fit a new cylinder. Whether you are near Diamond Hills Plaza, Sycamore Canyon Park, the Diamond Bar Golf Course or Diamond Bar Center, or along Golden Springs Dr, 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 lock replacement page.

Lock Replacement in Diamond Bar — FAQs

Do you offer lock replacement in Diamond Bar at night or on weekends?
Yes. We are available 24/7 and fully mobile, so we can come to your Diamond Bar home or office at any hour. Call (323) 997-8867 to get started.
Should I replace my old deadbolt or just rekey it?
If the lock is in good mechanical shape, rekeying is often enough to change who has access. If it sticks, no longer retracts, or is badly worn, replacement is the better choice. We will inspect it and tell you which makes sense.
My deadbolt sticks in hot weather. Why does that happen?
Heat can cause doors and frames to expand slightly, which misaligns the bolt and strike plate. Worn internal parts make it worse, especially in older homes. Sometimes an adjustment solves it, and sometimes the lock needs replacing.
Can you install smart or keypad locks?
Yes. Electronic and smart deadbolts are increasingly common in Diamond Bar, and we install and set them up so you know how to program codes and use the features.
Can you work on locks in The Country Estates?
Yes. We handle high-end entry hardware and multi-point patio-door locks with care for the finish. Let us know about gate access when you call (323) 997-8867 so we can plan the visit.
What if a key breaks in my office lock?
We can extract the broken key and install a new cylinder, including on aluminum-storefront commercial doors, even after hours.
Do I need to visit your shop?
No. Crenshaw Lock Company is mobile only, with no storefront. We bring the tools and hardware to your door.
How is the cost of lock replacement determined?
It depends on the lock type, how many locks, door condition, and urgency. Call (323) 997-8867, describe your situation, and we will explain what affects the price.
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