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Crenshaw Lock

Master Key System in Downey · 24/7 mobile

Master Key System in Downey, California

Crenshaw Lock Company designs and installs master key and restricted key systems with key control for Downey businesses, retailers, and property managers. We are fully mobile and available 24/7, so we come to your site. Call (323) 997-8867 to talk through your doors and who needs access to what.

  • Mobile to your Downey location
  • Available 24/7
  • Price quoted before we start
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A master key system lets one key open many locks while other keys open only some. A store manager might carry a key that opens every door, a stock employee a key for the back room and loading door, and a part-time hire a key for the sales floor alone. Done well, it replaces a jangling ring of keys with a clear structure of who can go where. Done badly, it creates gaps nobody notices until a key goes missing.

Downey has a mix of properties that benefit from this. There are retail tenants around Stonewood Center and Firestone Blvd, offices and shops in Downtown Downey, businesses near the redeveloped Downey Landing site, and multi-door properties along Lakewood Blvd and Imperial Hwy. Each one has different needs, and a master key plan should be built around your actual doors and your actual people, not a stock template.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, led by owner and lead technician David Shar. We are a mobile service with no storefront, so the planning, rekeying, and installation all happen at your property. We also cover restricted keyways and key control, which matter most when you need to stop keys from being copied at a hardware counter without permission.

How it works in Downey

  1. 1

    Walk the property and list every door

    We start by going through your building and noting every lock: front entries, back rooms, offices, storage, utility closets, gates, and any cabinets or other hardware that should be included. We also check what hardware you already have, since some existing locks can be rekeyed and others are better replaced.

  2. 2

    Map out who needs access to what

    Next we talk through your people and roles. Owners, managers, staff, cleaners, vendors, and maintenance each get a defined level of access. We lay this out as a hierarchy so the structure is simple enough to manage after we leave.

  3. 3

    Choose the keyway and level of key control

    Standard keyways can be duplicated almost anywhere. A restricted keyway limits duplication to authorized parties, which is useful if turnover is high or the property has several tenants. We explain the tradeoffs so you can pick what fits your risk and budget.

  4. 4

    Pin, rekey, and install on site

    We rekey compatible cylinders and install new hardware where needed, pinning each lock to the plan. Because we are mobile, we work at your location and can often schedule around business hours or do after-hours work, since we are available 24/7.

  5. 5

    Test every key against every lock

    Before we finish, we test each key level on each door to confirm it opens what it should and nothing else. A master system only works if the layers are correct, so we check the whole matrix rather than a few doors.

  6. 6

    Hand over a record and a key plan

    We give you a clear key schedule so you know which keys exist and which doors they open. We also explain how to handle future changes, like adding a door, replacing an employee, or re-keying after a lost key.

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What affects the price

  • The number of doors and cylinders included in the system, since each lock must be keyed or replaced.
  • How many access levels you want, from a single master to multiple sub-masters by department, tenant, or floor.
  • Whether existing hardware can be rekeyed or has to be replaced, which depends on its age, grade, and condition.
  • The type of keyway, with restricted or patent-protected key control costing more than a standard keyway.
  • The number of keys needed per level, including extra copies for staff and managers.
  • Scheduling needs, such as after-hours or overnight work to avoid disrupting a retail operation.

Why Downey chooses us

  • Fully mobile service. We come to your Downey property and do the work on site, so there is no storefront trip or drop-off.
  • Operating since 1987, with owner and lead tech David Shar overseeing the work.
  • Available 24/7, which helps retailers who can only change locks after closing or on short notice after a management change.
  • System design based on your real doors and roles, not a one-size layout copied from another business.
  • We explain the limits of a master system honestly, including the tradeoff that more levels add complexity and a master key raises the stakes if it is lost.
  • We test the full key matrix before we leave, and we hand over a written key schedule.

Master Key System across Downey

Downey is a larger, lower-density city than many of its neighbors, and its commercial side reflects that. Stonewood Center draws a busy mix of retail tenants, and the Firestone Blvd and Lakewood Blvd corridors are lined with shops and offices. When a business changes managers or tenants, a common request is a rekey with a master key setup so the new team controls every door and old keys stop working. That scenario comes up often for retailers near Downey Landing, the redeveloped former aerospace site, where newer tenants want clean control of their space.

Downtown Downey has older buildings, some dating to the 1920s, where original hardware may be worn or mismatched. A master key plan there often starts with deciding which locks are worth keeping and which should be upgraded. In ZIP 90240, covering North Downey, larger and some semi-gated properties can benefit from a restricted keyway for home offices, guesthouses, or multi-building estates. Orange Estates and the mid-century ranch tracts across 90241 and 90242 also see small landlords and owners with several doors or units who want a simple key structure.

We reach Downey via I-5, I-105, and I-605, and also work along Florence Ave, Imperial Hwy, and Paramount Blvd. Whether your site is near Porto's Bakery, Columbia Memorial Space Center, or a quiet street in North Downey, call (323) 997-8867 and we can talk through your layout.

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Other Downey locksmith services

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

Master Key System in Downey — FAQs

What is a master key system?
It is a lockset arrangement where each lock has its own key, and one or more higher-level keys open multiple locks. This lets managers, owners, or maintenance staff have broader access while others only open the doors they need.
Can my existing locks be part of a master key system?
Often yes, if the cylinders are in good condition and compatible. Older or worn hardware may be better replaced. We look at each door during the walkthrough. You can reach us at (323) 997-8867 to describe what you have.
What does a restricted keyway do?
A restricted keyway uses a key blank that is not freely sold, so copies generally require authorization. It adds key control, which is helpful for multi-tenant buildings, retailers with turnover, and properties where you want to know who holds keys.
Can you set up a master key system after a change in management?
Yes. This is common for retailers and offices. We can rekey the doors, build a new access structure, and make sure old keys no longer work. Call (323) 997-8867 to schedule, including after hours if needed.
Is a master key system less secure than individual keys?
It adds some risk, because a lost master key opens many doors. That is why we recommend limiting how many master keys exist, choosing a restricted keyway where it makes sense, and keeping a clear key record.
Do you work evenings or weekends in Downey?
Yes. We are available 24/7 and fully mobile, so we can often work around your business hours. We do not have a storefront, since we come to your location.
Can a homeowner use a master key system?
Sometimes. It can make sense for larger North Downey properties with a main house, guesthouse, and outbuildings, or for owners of several rental doors. For a typical ranch home, a simple rekey so all doors match is often enough.
How do I get started?
Call (323) 997-8867 and tell us how many doors you have, what type of property it is, and who needs access. We will talk through options and plan a site 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