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(323) 997-8867
Crenshaw Lock

Master Key System · 24/7 mobile

Master Key System Installation in Los Angeles & Ventura County

Crenshaw Lock Company designs and installs master key and restricted key systems with key control for businesses and property managers across Greater Los Angeles and Ventura County. We come to your site, 24/7. Call (323) 997-8867 to plan your system.

  • Mobile — we come to your location
  • Available 24/7
  • Upfront price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
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A master key system lets one key open many doors while each person carries only the access they need. A property manager may hold a key that opens every unit, a department head may open a floor, and an employee may open a single suite. Done well, it replaces a heavy ring of keys with a clear hierarchy. Done poorly, it creates security gaps and confusion.

The work starts with planning, not cylinders. We look at how your building is used, who needs access to what, and how you expect that to change. From there we lay out a key hierarchy, choose hardware that supports it, and set up key control so you can track who holds which keys and make it harder for unauthorized copies to be made. Restricted keyways are one option for that purpose.

Crenshaw Lock Company has served this region since 1987 and is fully mobile. David Shar and our team work at your property, whether you are rekeying an existing building, adding a system to a new tenant space, or tightening control after lost keys or staff turnover. We explain the tradeoffs plainly so you can decide what fits your building.

How our master key system service works

  1. 1

    Walk-through and access needs

    We visit your property, count the doors, and note the existing hardware. We ask who needs access to which areas, which doors are shared, and which must stay tightly controlled.

  2. 2

    Key hierarchy design

    We map out levels such as grand master, master, and individual keys. We write the plan in a clear chart so you can see which key opens which door before any work begins.

  3. 3

    Hardware selection

    We recommend cylinders and keyways that suit the system and your control goals, including restricted keyways when you want to limit unauthorized duplication. We discuss compatibility with your existing locks.

  4. 4

    Installation and pinning

    On site, we install or rekey cylinders and pin them to the approved hierarchy. We work door by door so your business stays open as much as possible.

  5. 5

    Testing and key issuing

    We test every key against every door it should and should not open. Then we cut and label keys and hand them over according to your plan.

  6. 6

    Key control and records

    We help you set up a simple way to record who holds which keys and how to request more. We keep the system's design information so future additions fit the original plan.

What affects the price

  • The number of doors and cylinders included in the system
  • How many levels the key hierarchy has and how many keys of each level are needed
  • Whether existing hardware can be rekeyed or must be replaced
  • Standard versus restricted keyway hardware and the key control it provides
  • Whether you are building a new system or expanding an existing one
  • Site conditions such as access hours, multiple buildings, or phased work

Why choose us

  • Fully mobile service: we work at your building rather than asking you to bring hardware to a shop
  • Planning comes first, with a written hierarchy you approve before we install
  • We have served Greater Los Angeles and Ventura County since 1987
  • Owner and lead technician David Shar is involved with our work
  • We explain the real tradeoffs of restricted keyways and key control so you can choose what fits
  • We design systems so they can be expanded later without starting over

Where we work

We install master key and restricted key systems throughout Greater Los Angeles. That includes the San Fernando Valley and the San Gabriel Valley, where office parks, apartment communities, schools, and light industrial buildings often need layered access. We also work in the South Bay and Harbor area, the Westside, and the Gateway Cities.

Our work extends across Central and South LA and into parts of Ventura County. Because we are fully mobile, we come to your property wherever it is within that area. Call (323) 997-8867 any time, day or night, to talk through your building and set up a site visit.

Need master key system now?

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

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Related services

Master Key System — FAQs

What is a master key system?
It is a lock and key arrangement in which each door has its own key, and higher-level keys open groups of doors or all of them. It lets people carry only the access they need.
Can you convert my existing locks to a master key system?
Often yes. Many commercial cylinders can be rekeyed into a system, though some hardware may need replacing. We assess it on site. Call (323) 997-8867 to schedule a visit.
What is a restricted key system?
It uses a keyway with controlled distribution, making it harder to copy keys without authorization. It is a common way to add key control to a master key system.
Does a master key system reduce security?
A master system has more possible key combinations than a single-key lock, so careful design matters. A well-planned hierarchy with good key control can be a sound choice for many buildings.
Can I add doors to the system later?
Usually yes, if the system was planned with growth in mind. We keep the hierarchy design so new doors and keys fit the original plan.
What should I do if a master key is lost?
Tell us promptly. Depending on the key's level, we may rekey the affected doors or restructure the system. Call (323) 997-8867 and we will talk through the options.
Do you work on apartment and multi-tenant buildings?
Yes. Property managers often need a key that opens many units, with each tenant keeping a private key. We design the hierarchy around how the property operates.
Will the work disrupt my business?
We plan the sequence with you and work door by door so you can keep operating. We can discuss scheduling around your hours when we plan the visit.
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