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Crenshaw Lock

Master Key System in San Gabriel · 24/7 mobile

Master Key System in San Gabriel, California

Crenshaw Lock Company designs and installs master key and restricted-key systems with real key control for properties in San Gabriel, California. We are fully mobile and available 24/7, so we come to your building. Call (323) 997-8867 to plan a system that fits how your property actually operates.

  • Mobile to your San Gabriel 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 sounds simple: one key opens many doors, and other keys open only some. In practice, a good system is a plan. It decides who can go where, how keys are tracked, and what happens when someone leaves with a key in a pocket. In San Gabriel, that plan looks different for a restaurant on Valley Boulevard than for a landlord with a mid-century apartment building or a property manager with several small offices.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, led by owner and lead tech David Shar. We are a mobile-only operation, with no storefront to visit. We walk your property, look at the doors and hardware you already have, and talk through who needs access to what before we recommend anything. That conversation is where most of the value comes from.

San Gabriel has an unusual mix of buildings. Dense commercial corridors have aluminum storefront doors and roll-gates. Residential streets have older homes and apartment buildings with a range of hardware. A master key system has to work with what is actually on the doors, so we design around your hardware rather than forcing a one-size-fits-all package.

How it works in San Gabriel

  1. 1

    Walk the property and map the doors

    We visit in person and list every door, gate, mailbox, and cabinet that needs a lock. We note the hardware type, condition, and whether it can accept the cylinders a master system needs. Aluminum storefront doors, wood doors, and roll-gates each have their own constraints.

  2. 2

    Define access levels

    We sit down with you to decide who gets what: a grand master for ownership, a master for managers, and change keys for individual tenants, rooms, or staff. We also talk about contractors, cleaners, and delivery access so nothing is missed.

  3. 3

    Design the keying and key control

    We lay out the keying hierarchy on paper and recommend whether a standard or restricted keyway makes sense. Restricted keys cannot be casually duplicated at a hardware store, which matters when you want real control over who holds a copy.

  4. 4

    Install, rekey, or replace cylinders

    We fit the new cylinders, rekey existing ones where it is practical, and replace hardware that is worn or incompatible. Every lock is tested with every key level to confirm each key opens exactly what it should and nothing more.

  5. 5

    Hand over keys and records

    You receive the keys, a clear key schedule, and guidance on logging who holds what. We explain how to order additional keys safely so the system stays intact as staff and tenants change.

  6. 6

    Ongoing changes and expansion

    When you add a door, lose a key, or turn over a unit, we can adjust the system without starting over. Because we are available 24/7, urgent changes after a security incident can be handled when they happen.

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What affects the price

  • The number of doors, gates, mailboxes, and other locks included in the system.
  • How many access levels you need, such as grand master, master, and individual change keys.
  • Whether you choose a restricted keyway with tighter duplication control versus a standard keyway.
  • The condition and type of existing hardware, and how much can be rekeyed versus replaced.
  • Door and frame types, since storefront, roll-gate, and older wood doors may need different cylinders or adapters.
  • The number of keys to cut and any later additions or rekeys as tenants or staff change.

Why San Gabriel chooses us

  • Mobile service means we assess your actual doors on site instead of quoting from a description over the phone.
  • Experience since 1987 across commercial, multi-unit, and older residential hardware, which matters in a city with such varied buildings.
  • We design around key control and tell you plainly when a simpler rekey would serve you better than a full master system.
  • We can work with period hardware near the Mission, including older mortise locks, without forcing modern replacements where careful service will do.
  • Owner and lead tech David Shar stands behind the work, and we do not make timing or price promises we cannot keep.
  • Available 24/7 for urgent rekeys, lost master keys, or lockouts that affect a system we have installed.

Master Key System across San Gabriel

San Gabriel's business and housing patterns shape what a good master key system looks like here. Along Valley Boulevard's Golden Mile restaurant row, owners deal with staff turnover, shared back doors, delivery access, and storefront hardware that takes heavy daily use. A system there often needs a manager level, a staff level, and tighter control over who can open storage and office doors. San Gabriel Boulevard and the Del Mar and Mission Playhouse district have similar needs for small shops and offices, in ZIP codes 91776 and 91775.

Residential and multi-unit properties raise different questions. A landlord with a mid-century apartment building off Las Tunas Drive in the Las Tunas area often wants a clean way to rekey after tenant turnover, with a master key for the owner or manager and unique keys for each unit. Mailbox locks and common-area doors can be folded into the same plan so one key schedule covers everything. Properties in 91778 and nearby streets often fit this pattern.

In the Mission District, around Mission San Gabriel Arcangel, which dates to 1771, many 1900s to 1920s Craftsman and Spanish Colonial Revival buildings still carry original mortise locks and skeleton-key doorsets. Where those buildings now house small offices or rental units, we look at what can be preserved and keyed sensibly rather than ripping out period hardware. Whether you are near Vincent Lugo Park, off I-10, or anywhere in town, call (323) 997-8867 and we will come to you.

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Other San Gabriel locksmith services

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

Master Key System in San Gabriel — FAQs

What is a master key system?
It is a keying plan where each lock has its own key, and higher-level keys open multiple locks. For example, a tenant key opens one unit while a manager or owner key opens all of them. Call (323) 997-8867 to talk through what fits your property.
What is the difference between a master key system and a restricted key system?
A master system controls which keys open which doors. A restricted keyway adds control over duplication, so copies generally cannot be made at an ordinary key shop. Many properties combine both for stronger key control.
Can you convert my existing locks into a master key system?
Often yes. Many cylinders can be rekeyed into a system, while worn or incompatible hardware may need replacing. We inspect the doors on site and tell you honestly which is which.
Does a master system make sense for a restaurant on Valley Boulevard?
It can. Restaurants have staff turnover, shared back doors, and storage or office areas that not everyone should enter. A system with manager and staff levels helps, and we can also address storefront deadbolt problems. Call (323) 997-8867.
Can you set up keys for a multi-unit apartment building near Las Tunas Drive?
Yes. We can key each unit individually, give the owner or manager a master, and include common doors and mailbox locks. It also makes rekeying after tenant turnover much simpler.
Can you work with older mortise locks near the Mission?
We can often service or sympathetically rekey original mortise hardware so period character is preserved. Whether it can join a master system depends on the lock, which we evaluate in person.
What happens if a master key is lost?
Tell us right away. Depending on the system, we may rekey affected locks or reissue levels so the lost key no longer works. We are available 24/7 at (323) 997-8867.
Do I need to visit a shop to get started?
No. We are mobile only and come to your property in San Gabriel. We assess the doors, plan the system with you, and handle installation on site.
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