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Crenshaw Lock

Master Key System in La Puente · 24/7 mobile

Master Key System in La Puente, California

Crenshaw Lock Company designs and installs master key and restricted key systems with real key control for La Puente businesses, landlords, and property managers. We are a fully mobile locksmith available 24/7, and we come to your property. Call (323) 997-8867 to plan your system.

  • Mobile to your La Puente location
  • Available 24/7
  • Price quoted before we start
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A master key system lets one key open many doors while each person carries only the key they need. A tenant opens their own unit, a manager opens every unit, and a maintenance worker opens only the utility rooms. In La Puente, that structure fits a lot of properties: strip-mall tenants along Valley Boulevard, small landlords with a main house and a converted-garage ADU, and apartment buildings from the 1970s that have collected a mix of keys over the years.

Most of the trouble we see comes from keys accumulating over decades. Former tenants, past employees, and contractors may still hold copies, and nobody can say who has what. A properly designed system fixes that. It starts with a plan on paper, followed by cylinders pinned to match it, and a record of who holds which key. Restricted keyways add another layer, because the blanks cannot be duplicated at a hardware store counter.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar knows how older buildings behave. We are mobile only. There is no storefront to visit, so we do the survey, the pinning, and the installation at your door, whether that is an aluminum storefront on Hacienda Boulevard or a stucco tract home near Valinda.

How it works in La Puente

  1. 1

    Walk the property and learn how it is used

    We start by looking at every door you want included: entry doors, storefront doors, back rooms, utility closets, gates, and any ADU or garage conversion. We ask who needs access to what and when. A retail strip has different needs than a duplex with a rented-out unit.

  2. 2

    Design the key hierarchy

    We map out the levels of access, such as a change key for each door, a master for a group of doors, and a grand master if the property calls for one. We keep the structure as simple as the property allows. More levels mean more complexity and a bit less security, so we only add what you will actually use.

  3. 3

    Choose hardware and keyway

    We match cylinders to your existing locks wherever possible, including storefront cylinders and deadbolts. If you want key control, we discuss restricted keyways, where duplication is limited to authorized channels. Where an old lockset cannot accept a good cylinder, we recommend replacing it.

  4. 4

    Pin, install, and test every lock

    We pin cylinders to the plan on site, install them, and test every key against every door it should and should not open. That check catches mistakes before they become lockouts at a bad moment.

  5. 5

    Document the system and hand over keys

    You get a written key schedule showing which key opens which door and who was issued what. We also explain how to request new keys, how to handle a lost one, and when it makes sense to rekey part of the system.

  6. 6

    Plan for growth and turnover

    Tenants move and staff change. A good system is built so you can rekey one door or one unit without redoing the whole property. We leave room to expand and are available 24/7 at (323) 997-8867 when something changes.

Need master key system in La Puente?

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What affects the price

  • The number of doors and cylinders included, since each one has to be pinned and tested.
  • How many access levels the hierarchy needs: a simple master over a few doors is different from multiple groups with a grand master.
  • Whether you choose a restricted keyway with controlled duplication or a standard keyway.
  • The condition of existing hardware, because worn or builder-grade locksets may need replacing before they can hold a good cylinder.
  • Door type, such as aluminum storefront, wood residential, or gate hardware, which affects the cylinder style required.
  • How many keys you need cut and whether you want a full written key schedule and records prepared.

Why La Puente chooses us

  • We have worked since 1987, so we have seen how mid-century buildings and older commercial hardware age and fail.
  • We are fully mobile, so the survey, pinning, and installation all happen at your property with no shop visit.
  • We design for how you actually operate, not for the biggest system possible, so you do not pay for complexity you will not use.
  • We deliver a written key schedule and explain how to manage lost keys and turnover.
  • We are available 24/7, so a failed storefront cylinder or lockout does not wait for business hours.
  • We are honest when a simple rekey or keyed-alike setup is all you need and a full master system would be overkill.

Master Key System across La Puente

La Puente is a dense, working-class suburb where small properties often hold several doors. Much of the housing is 1950s and 60s single-story stucco tract homes, many still carrying original or builder-grade entry locksets and aging deadbolts. On streets toward Valinda and Bassett, we see homes where the owner has added a converted-garage ADU or rental unit. A keyed-alike setup or a small master system lets a landlord open the main house and the unit with a controlled key set, while the tenant's key opens only their door. That is especially useful after a tenant change, when the old keys need to stop working.

On the commercial side, the Valley Boulevard corridor and the Hacienda Boulevard retail strip are full of aluminum-storefront shops and small strip malls. These doors use narrow-stile hardware, and the storefront deadbolt or pivot is often the first thing to fail. When we replace those cylinders, it is a good moment to pin them into a system, so the owner holds a master and each staff member holds only what they need. Properties in ZIP codes 91744, 91746, and 91747 all fall in our service area, including the Hudson and Sunset neighborhoods and the areas near La Puente Park and The Donut Hole.

Because we are mobile, we come to you from wherever we are working, with access along I-10, SR-60, Valley Boulevard, Hacienda Boulevard, and Amar Road. Call (323) 997-8867 any time to talk through your property.

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Other La Puente locksmith services

See all of our La Puente services, or our citywide master key system page.

Master Key System in La Puente — FAQs

What is a master key system?
It is a lock setup where each door has its own key, and a higher-level master key opens a defined group of doors. It lets a manager or owner access everything while employees or tenants carry only their own key.
Does a small landlord with an ADU need a master key system?
Often a keyed-alike or small master setup is enough. If you own a main house and a converted-garage unit in La Puente, we can arrange it so you have one key for both while the tenant's key opens only the unit. Call (323) 997-8867 to talk through it.
Can you work with my existing locks?
Often yes. We try to reuse compatible hardware and change only the cylinders. Worn or builder-grade locksets, common in 1950s and 60s homes, may be better replaced so the system is reliable.
What is a restricted keyway?
It is a keyway whose blanks are controlled, so copies cannot easily be made at an ordinary key counter. It adds real key control, which helps retail businesses and multi-unit properties limit who can duplicate keys.
Can you install a system on aluminum storefront doors?
Yes. We work with storefront deadbolts, pivots, and narrow-stile hardware common along Valley Boulevard and Hacienda Boulevard. We can replace a failed cylinder and pin it into your system in the same visit.
What happens if a master key is lost?
We assess which doors are affected and recommend a response, which may be rekeying some or all cylinders. Because we keep a written key schedule, we can limit the work to what is needed. Call (323) 997-8867 right away.
Do you come to my property, or do I have to visit a shop?
We are fully mobile and have no storefront. We survey, install, and test at your location in La Puente, and we are available 24/7.
How do I add a tenant or employee later?
A well-designed system leaves room for expansion. We can cut new keys, add cylinders, or rekey one door without redoing everything, and we update your key schedule when we do.
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