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Crenshaw Lock

Deadbolt Installation in Duarte · 24/7 mobile

Deadbolt Installation in Duarte, California

Crenshaw Lock Company installs and replaces single- and double-cylinder deadbolts in Duarte, California, 24 hours a day, 7 days a week. Our fully mobile technician comes to your door with the hardware and tools. Call (323) 997-8867 to talk through your door and get started.

  • Mobile to your Duarte location
  • Available 24/7
  • Price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
Deadbolt bolt extended into a reinforced strike plate
Open now(323) 997-8867

A deadbolt is one of the simplest ways to make a door harder to defeat, but only if it is the right lock, installed correctly, in a door and frame that can support it. In Duarte, that last part matters more than people expect. Many homes here were built in the 1950s and 1960s, and their doors, strike plates, and frames have had decades to loosen, warp, or get repainted shut. A good deadbolt installation looks at the whole door, not just the lock.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar built the business around coming to the customer. We are fully mobile. There is no storefront to visit; we bring the work to your home, condo, or office, at any hour of the day or night.

Whether you are adding a deadbolt where there is only a knob lock, replacing a worn or sticking one, or upgrading after a scare, we will explain the options in plain language. We will talk through single versus double cylinder, how the bolt and strike should be set, and what your door can realistically handle before we install anything.

How it works in Duarte

  1. 1

    Call and describe the door

    Phone (323) 997-8867 any time. Tell us what kind of door it is, whether there is already a deadbolt, and what prompted the change. A new move-in, a break-in attempt, and a worn lock all point toward slightly different solutions.

  2. 2

    Assess the door and frame on site

    Our technician comes to you and checks the door thickness, the existing bore holes, the edge, and the jamb. On older tract-home doors we look for loose hinges, cracked frames, and shallow strike plates, since those weaknesses undercut any lock.

  3. 3

    Choose single or double cylinder

    A single-cylinder deadbolt uses a key outside and a thumb-turn inside. A double-cylinder needs a key on both sides, which can matter near glass but also affects how quickly you can exit in an emergency. We explain the tradeoffs so the choice is yours.

  4. 4

    Install and align the hardware

    We drill or reuse bores as appropriate, fit the bolt and latch, and set the strike plate so the bolt throws fully into the frame. Longer screws into the framing, where suitable, help the strike resist force.

  5. 5

    Test, key, and walk through

    We run the lock repeatedly with the door open and closed, confirm smooth operation, and hand over keys. If you want, we can key the new deadbolt to match your other locks so you carry fewer keys.

Need deadbolt installation in Duarte?

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

Call (323) 997-8867

What affects the price

  • Whether this is a new installation that needs new holes drilled or a replacement that fits the existing bore
  • Single-cylinder versus double-cylinder hardware, and the security grade and brand you select
  • Door material and condition, such as solid wood, hollow-core, metal, or a door that has warped or been patched
  • Frame and strike repairs or reinforcement needed so the bolt seats properly
  • How many doors are being done, such as front, back, and garage entry in one visit
  • Whether you want the new locks keyed alike or matched to existing keys, and the time of day or night of the call

Why Duarte chooses us

  • Fully mobile service: the technician arrives with hardware and tools, so there is no trip to a shop and no storefront to visit
  • Open 24/7, which helps when a deadbolt is needed right after a break-in attempt or a late-night move-in
  • In business since 1987, with owner David Shar leading the work and standing behind it
  • We assess the door and frame before recommending a lock rather than selling the same deadbolt for every door
  • Straightforward explanations of single versus double cylinder, including the safety tradeoffs
  • We can pair a deadbolt install with a rekey so front, back, and garage doors all work on one key

Deadbolt Installation across Duarte

Duarte's housing mix shapes how we approach deadbolts. In the Butler and Cotter neighborhoods, many single-story ranch and tract homes from the 1950s and 1960s still have their original doors and frames, often with a basic knob lock and little else. Adding a properly seated deadbolt, and reinforcing the strike, is a common upgrade there, often done together with a whole-house rekey after a purchase so the front, back, and garage doors share one key.

Farther north, custom foothill homes climbing toward Royal Oaks and the Fish Canyon area have their own needs. Longer driveways, side gates, and more secluded entries mean a deadbolt upgrade often goes hand in hand with gate-lock work, especially after a break-in attempt. In ZIP codes like 91010 and 91009, we also see newer condos and apartments near the A Line, where the work is usually a clean replacement on a standard entry door.

Near City of Hope, many medical professionals keep long and irregular hours, so a lockout or a worn deadbolt rarely waits for business hours. Because we are mobile and available around the clock, we can reach homes off Huntington Drive (Route 66), Mountain Avenue, and Buena Vista Street, or along routes from I-210 and I-605, whenever you need us.

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 Duarte locksmith services

See all of our Duarte services, or our citywide deadbolt installation page.

Deadbolt Installation in Duarte — FAQs

Can you install a deadbolt where there is only a knob lock?
Yes. We can add a deadbolt to a door that has only a knob or lever by drilling the proper holes, provided the door is thick and solid enough. Call (323) 997-8867 and describe your door, and we will confirm what is possible.
Should I choose a single- or double-cylinder deadbolt?
Single-cylinder is the usual choice for most entry doors because you can leave quickly with the thumb-turn. Double-cylinder suits doors with nearby glass but needs a key inside, which can slow an emergency exit. We will go over both for your door.
Will a new deadbolt help if my door frame is old?
A deadbolt is only as strong as what it bolts into. Many 1950s and 1960s homes in Duarte have aging frames, so we check the jamb and strike and recommend reinforcement where it makes sense.
Do you install deadbolts at night or on weekends?
Yes, we are available 24/7 and fully mobile. If you need a deadbolt after a break-in attempt or late move-in, call (323) 997-8867 any time.
Can the new deadbolt use the same key as my other locks?
Often yes. We can key a new deadbolt to match existing locks or rekey several doors together, so the front, back, and garage doors work with one key.
Can you upgrade a deadbolt on a foothill home near Royal Oaks or Fish Canyon?
Yes. We work on homes throughout Duarte, including the foothill areas, and can pair a deadbolt upgrade with gate-lock work if you are concerned about side or rear access.
How is the price of a deadbolt installation determined?
It depends on the hardware grade, whether holes must be drilled, door and frame condition, the number of doors, and the time of the call. We explain the factors before work begins. You can reach us at (323) 997-8867.
Do I need to come to your shop to pick up a lock?
No. Crenshaw Lock Company is mobile only, so there is no storefront. Our technician brings the hardware to your Duarte home or office.
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