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Crenshaw Lock

Master Key System in Claremont · 24/7 mobile

Master Key System Design and Installation in Claremont, CA

Crenshaw Lock Company designs and installs master-key and restricted-key systems with real key control for Claremont businesses, campuses, and property managers. We are a fully mobile locksmith available 24/7 and have served the area since 1987. Call (323) 997-8867 to plan a system around your building.

  • Mobile to your Claremont location
  • Available 24/7
  • Price quoted before we start
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A master key system lets different people open different doors with different keys, while a select few keys open many doors. Done well, it saves a ring of twenty keys for a facilities manager and gives the owner a clear record of who can go where. Done badly, it creates a tangle of duplicated keys, unknown copies, and doors nobody can account for. Claremont has both kinds of situations, and we have spent decades untangling and preventing them.

The city is unusual. The Claremont Colleges consortium (Pomona, Harvey Mudd, Scripps, Claremont McKenna, Pitzer, and the graduate institutions) runs on institutional access control: residence halls, labs, studios, and administrative buildings, each with its own people who need access. Around them, Claremont Village along Yale Ave has small retail shops, offices, and restaurants in older buildings, and the surrounding neighborhoods have historic homes where original hardware matters. Each setting calls for a different approach to a master key system.

Crenshaw Lock Company is owned and led by David Shar, and we are entirely mobile. There is no storefront to visit. We come to your building, walk the doors with you, and design the system on site. That matters for master keying, because the right design comes from seeing how people actually move through a space, not from a catalog.

How it works in Claremont

  1. 1

    Walk the building and the people

    We visit the property and look at every door that will be part of the system: exterior entries, offices, storage rooms, mechanical spaces, and shared areas. We also ask who needs access to what. A department head, a custodian, a maintenance contractor, and a tenant all have different needs, and the design starts there.

  2. 2

    Map the key hierarchy

    We lay out the levels: individual change keys, group or area keys, a master key, and a grand master if the building warrants one. We talk through how many levels you truly need, since each added level adds some complexity and a little more risk if a key goes missing.

  3. 3

    Choose the right hardware and key control level

    Some buildings are fine with a conventional master-keyed system. Others need restricted keyways, where duplication is limited to authorized people, and a documented key control process. We explain the tradeoffs between convenience and security so you can pick based on your situation.

  4. 4

    Install, rekey, or replace cylinders

    We pin or install cylinders to match the plan. Where existing locks are sound, we rekey them into the system rather than replacing them. Where they are worn or the wrong type, we recommend replacements. For older buildings, we look for ways to keep original hardware where practical.

  5. 5

    Test every door and every key

    Before we finish, we operate every key on every door it should open and confirm it does not open anything it should not. Mistakes in a master key chart are easiest to catch at this stage.

  6. 6

    Hand over records and a key control plan

    You get a clear key schedule showing which keys open which doors, plus guidance on issuing, tracking, and recovering keys. We also discuss how to expand the system later, so future doors can join without starting over.

Need master key system in Claremont?

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

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What affects the price

  • The number of doors and cylinders in the system, since each one must be keyed to the plan.
  • How many levels the hierarchy needs, from simple master and change keys to grand master arrangements.
  • Whether you want standard keyways or restricted keyways with controlled duplication.
  • The condition and type of existing hardware, and whether locks can be rekeyed or must be replaced.
  • The number of keys to be cut and how they are to be stamped, tracked, and issued.
  • Scheduling, such as work that must happen after hours or in phases so a business or campus building stays usable.

Why Claremont chooses us

  • We have been serving Greater Los Angeles and Ventura County since 1987, so master keying is work we have done in many kinds of buildings.
  • We are fully mobile and design the system on site, after walking the doors with you.
  • We prioritize a hierarchy that is as simple as your building allows, rather than adding levels that create future headaches.
  • We can rekey sound existing hardware into the system, which can avoid unnecessary replacement.
  • We hand over written key records and explain how to maintain control after we leave.
  • We are available 24/7, so if a master key is lost or a door fails, you can reach us at (323) 997-8867.

Master Key System across Claremont

In Claremont Village, many businesses along Yale Ave and the nearby side streets occupy older buildings with a mix of hardware vintages. A shop owner may have a front door lock from one era, a back office lock from another, and keys that nobody can fully account for. A small master key system or a clean rekey can bring order. Near the center of the Village in ZIP code 91711, we often see landlords who want a master key for common areas while each tenant keeps a private key.

The Claremont Colleges are a different scale altogether. Residence halls, labs, studios, and academic offices each have their own access needs, and a well-planned hierarchy helps facilities teams manage turnover each semester. Restricted keyways and key control matter especially where many students, staff, and contractors pass through. We can work with a campus facilities team on a single building or a phased plan, and we will tell you plainly where an electronic access control system may fit better than mechanical keys.

Further out, North Claremont and the hillside Claraboya area include newer homes and some small properties with detached structures, guest houses, or shared access. Owners there sometimes ask about a simple master key setup so one key handles several locks. We reach all of it by road, whether via Foothill Blvd, Indian Hill Blvd, Base Line Rd, or from the I-10 and SR-210 corridors.

Locked out or need a locksmith now?

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Other Claremont locksmith services

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

Master Key System in Claremont — FAQs

What is a master key system?
It is a lock arrangement where each lock has its own key, while higher-level master keys open groups of locks or all of them. It lets you give people exactly the access they need and no more.
Can you add my existing locks to a master key system?
Often yes. Many sound cylinders can be rekeyed into a system. Worn or incompatible hardware may need replacement, and we will tell you which is which after inspecting it. Call (323) 997-8867 to discuss your doors.
What is a restricted key system?
A restricted system uses a keyway that is protected so keys cannot be casually copied at a hardware store. Duplication requires authorization, which helps you control who holds keys.
Is a master key system secure?
It can be, if designed and managed well. A master-keyed lock is inherently somewhat more complex than a single-key lock, so key control and a sensible number of levels are important. We explain the tradeoffs before we build anything.
Do you work with campus or institutional buildings in Claremont?
Yes, we handle master-key and key-control work for institutional and commercial buildings, including multi-building layouts. For larger plans we can phase the work. Call (323) 997-8867 to talk through your needs.
What happens if a master key is lost?
We assess the risk and the options, which may include rekeying affected cylinders or restructuring part of the system. Acting promptly limits exposure. We are available 24/7.
Can a Village business or landlord use a master key system?
Yes. A common setup gives each tenant a private key while a master key serves the landlord for common or service areas. We can design it to match your lease arrangement and building layout.
Do you have a shop I can visit?
No. We are fully mobile and come to your location, which also lets us see the actual doors and traffic patterns when planning your system.
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