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Crenshaw Lock

Master Key System in Covina · 24/7 mobile

Master Key System in Covina, California

Crenshaw Lock Company designs and installs master key and restricted key systems with real key control for Covina properties. We are fully mobile and available 24/7, coming to your building so we can plan around your doors. Call (323) 997-8867 to start a conversation about your keying needs.

  • Mobile to your Covina location
  • Available 24/7
  • 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 different people open different doors with different keys, while a few designated keys open many doors. A tenant's key opens only that suite, a manager's key opens a group of them, and the owner holds a key that opens everything. Done well, it replaces the ring of twenty keys that nobody can account for with a clear, documented hierarchy.

Covina is a good example of why planning matters. Downtown Covina along Citrus Ave has small retail and office spaces in older commercial buildings, while apartment communities, churches, medical offices and light commercial properties are spread across the city and out toward Charter Oak and Covina Hills. Each has its own mix of tenants, staff, vendors and after-hours access, and each needs a different key structure.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar brings that experience to every system we design. We are a mobile service with no storefront, so we come to your property, look at the actual doors and hardware, and build a system that fits them instead of selling a one-size-fits-all package. Because we are available around the clock, we can also schedule work at times that do not disrupt your business.

How it works in Covina

  1. 1

    Walk-through and door inventory

    We come to your Covina property and list every door that needs keying: suites, offices, storage rooms, mechanical rooms, gates and exterior entries. We note the existing hardware, its condition, and which locks can be re-pinned and which should be replaced.

  2. 2

    Access hierarchy planning

    We sit down with you to decide who needs access to what. That usually means grand master, master, and individual change keys, with extra levels where a property needs them. We put the structure in writing before any work starts so there are no surprises.

  3. 3

    Choosing key control level

    A standard system keeps things organized, but a restricted keyway adds real control. With restricted keys, copies cannot be made at a hardware store kiosk and are only issued through authorized channels. We explain the options and help you decide what level of protection matches your risk.

  4. 4

    Installation and rekeying

    We rekey or replace cylinders on-site according to the plan. Older hardware, such as original mortise locks in historic downtown buildings, is evaluated door by door so we only replace what truly needs it.

  5. 5

    Testing every door and key

    Before we leave, we test each key on each lock it should and should not open. Master-keyed systems are less forgiving than single-key locks, so verification matters.

  6. 6

    Records and ongoing key control

    We help you set up a key log and an issuing process, and we document the system so it can be expanded later. When a tenant leaves or a key goes missing, you have a clear path to rekey just the affected locks.

Need master key system in Covina?

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 or replaced.
  • How many levels the hierarchy needs, from a simple master and change keys to a multi-tier grand master design.
  • Whether you choose a standard keyway or a restricted keyway with patent-protected key control.
  • The condition and type of existing hardware, including older mortise or rim locks that may need rebuilding or replacement.
  • How many keys you need cut and issued at the start, and whether you want a record-keeping setup.
  • Whether the work involves a phased rollout across a larger property or after-hours scheduling.

Why Covina chooses us

  • Fully mobile service: we work at your doors, so the system is designed around what is actually installed.
  • Serving Greater Los Angeles and Ventura County since 1987, with the owner personally involved in system design.
  • We put the access hierarchy in writing before work begins, so you know who can open what.
  • We assess older hardware honestly and re-pin or rebuild where it makes sense instead of replacing everything.
  • Available 24/7, including for urgent rekeying after a lost master key or staff change.
  • We explain the tradeoffs of restricted keyways plainly, including what they do and do not protect against.

Master Key System across Covina

Covina's commercial mix makes master keying a practical need. In historic Downtown Covina, around Citrus Ave and near Heritage Plaza and the Covina Center for the Performing Arts, you find 1920s and 1930s buildings with small shops, offices and shared back spaces. Many have original mortise locks or older rim hardware, so a master key plan there often starts with deciding which locks can be saved and which should be modernized.

Outside the downtown core, we see property managers in Charter Oak (91724) and along Azusa Ave, Grand Ave and Badillo St who need to organize keys across apartment buildings, small office parks or church campuses. Covina Hills to the south has larger properties and gated or multi-building sites where a grand master plus restricted keys can reduce the number of keys in circulation. Properties in 91722 and 91723 also fit this pattern, particularly near San Bernardino Rd and Arrow Hwy.

Because we are mobile, we can meet you at the property, whether you are close to the Covina Metrolink station or just off the I-10. Call (323) 997-8867 and we will talk through your doors and your access needs.

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Other Covina locksmith services

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

Master Key System in Covina — FAQs

What is a master key system?
It is a keying setup in which each lock has its own key, and one or more higher-level keys open multiple locks. This lets you give staff, tenants or vendors only the access they need while managers and owners hold broader keys.
Can you set up a master key system for a business in downtown Covina?
Yes. We are mobile and come to your location. We inspect the doors, including older mortise and rim locks common in historic buildings, then design a system that fits. Call (323) 997-8867 to discuss your property.
What is a restricted key system?
A restricted system uses a keyway whose blanks are controlled, so copies generally cannot be cut without authorization. It adds key control on top of the master key hierarchy and is useful where unauthorized duplication is a concern.
Can my existing locks be used in a master key system?
Often yes, if the cylinders are in good condition and compatible. Some older or worn locks are better replaced. We assess this door by door during the walk-through.
What happens if a master key is lost?
Depending on the level of the key, you may need to rekey some or all of the locks it opened. A written hierarchy limits the damage. For urgent situations, call us 24/7 at (323) 997-8867.
Can the system be expanded later?
Yes, if it is planned with room to grow. We document the design so new doors, suites or tenants can be added without starting over.
Is a master key system less secure than individual keys?
It introduces some tradeoffs, since higher-level keys open more doors and the design is a bit more complex. Good planning, restricted keyways and careful key issuing manage that risk. We will explain the tradeoffs for your property.
Do you have a shop in Covina I can visit?
No. Crenshaw Lock Company is fully mobile with no storefront. We come to you at any hour, and you can reach us anytime at (323) 997-8867.
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