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Crenshaw Lock

Master Key System in Sierra Madre · 24/7 mobile

Master Key System in Sierra Madre, California

Crenshaw Lock Company designs and installs master key and restricted-key systems with real key control for Sierra Madre shops, offices, rentals and multi-door properties. We are fully mobile and available 24/7, and we come to you. Call (323) 997-8867 to talk through your doors and who needs access to them.

  • Mobile to your Sierra Madre location
  • Available 24/7
  • Price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
Large ring of master system keys with colored key caps
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A master key system solves a simple problem: too many keys, too many people, and no clear record of who can open what. In a town like Sierra Madre, that problem shows up in small and personal ways. A cafe near Kersting Court has an owner, a manager and opening staff. A landlord has several Craftsman cottages and a revolving door of tenants. A small office has a back room, a supply closet and a front entry that each need a different circle of people.

A master key system arranges the locks in a hierarchy. Each door can have its own key, groups of doors can share a key, and one master key can open all of them. A restricted keyway adds a layer on top, so the keys cannot be copied at a hardware counter without authorization. Together, that is key control: you decide who holds what, and you can prove it.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar built the business on mobile service. We have no storefront. We bring the tools, the cylinders and the planning to your property, whether that is a shop in the village core or an older building with doors that were never meant to be standard.

How it works in Sierra Madre

  1. 1

    Walk the property and list every door

    We start by looking at what you actually have: exterior doors, interior offices, storage rooms, gates and any older hardware. In Sierra Madre that can mean modern storefront cylinders next to century-old mortise locks, and we note which can be keyed into a system and which need an upgrade.

  2. 2

    Map who needs access to what

    We sit down with you and sketch the hierarchy. Which staff or tenants should open only one door? Which managers need a group of doors? Who holds the top-level master? Getting this right on paper prevents expensive changes later.

  3. 3

    Choose the keyway and level of key control

    We talk through standard versus restricted keyways. A restricted system makes unauthorized duplication much harder, which matters when keys pass through many hands. We explain the tradeoffs plainly so you can pick what fits your building and your habits.

  4. 4

    Pin the cylinders and install on site

    Because we are mobile, we do the work at your doors. We rekey existing cylinders where that makes sense and replace those that cannot take a master system, then test every key against every lock so nothing is left to chance.

  5. 5

    Cut, label and hand over keys with a record

    We deliver the keys, tag them in a way that does not advertise the door they open, and give you a clear key schedule. That record is the foundation of key control and makes future additions straightforward.

  6. 6

    Plan for growth and turnover

    Staff change, tenants move, and shops expand. We explain how to add doors, issue new keys or retire a lost one without starting over, so the system stays useful for years.

Need master key system in Sierra Madre?

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What affects the price

  • The number of doors and cylinders that need to be included, since each lock must be pinned or replaced to fit the hierarchy.
  • How many levels the system needs, such as individual keys, group keys and a top master, because more levels mean more planning and tighter tolerances.
  • Whether you choose a standard keyway or a restricted, patent-protected keyway with controlled duplication.
  • The condition and type of existing hardware, including older mortise locks or non-standard doors that may need retrofitting or replacement.
  • How many keys you need cut and whether you want extra control measures such as key tracking records.
  • Access to the property, such as a hillside lane where we must park below and carry equipment, which can affect how long the job takes.

Why Sierra Madre chooses us

  • We are fully mobile and work at your doors, so there is no shop to visit and no need to remove hardware and wait for it to come back.
  • Since 1987 we have worked on everything from modern commercial cylinders to old mortise hardware, which matters in a town with so much early-1900s construction.
  • We plan the hierarchy with you before touching a lock, so the system matches how your business or rentals actually operate.
  • We are available 24/7, so if a master key goes missing at night we can talk through next steps rather than leave you exposed.
  • We hand over a clear key schedule and explain how to expand the system, instead of leaving you dependent on guesswork.
  • We tell you honestly when a door is better replaced than forced into a system, rather than selling work you do not need.

Master Key System across Sierra Madre

Sierra Madre is compact and walkable, and its buildings reflect that. Around Downtown Sierra Madre and Kersting Court, small-shop storefronts sit close together, and many owners share the same concerns: a handful of employees, a back door, a storeroom and an owner who wants to know exactly who has keys. A simple master system with restricted keys can fit these shops well, and we can work at off-hours so your doors are not tied up during business.

Residential and rental owners have a different picture. Early-1900s Craftsman cottages, Victorians and bungalows near the village, in ZIP code 91024 and across 91025, often change tenants. Rather than carrying a ring of mismatched keys, a landlord can have each unit keyed separately with a master for the owner or property manager. When a tenant leaves, a rekey is far simpler than replacing everything.

Sierra Madre Canyon adds its own challenges. Narrow, steep lanes and old cabins often mean original skeleton-key mortise locks and non-standard doors. If the van has to park below, we carry what we need up on foot, and we assess whether a lock can be retrofitted or whether a carefully chosen replacement serves you better. We reach the area from Sierra Madre Blvd, Baldwin Ave, Michillinda Ave and Sierra Madre Villa Ave, with the I-210 close by. Whether you are near Mary's Market, the trailhead for Bailey Canyon Wilderness Park, or the start of the Mount Wilson Trail, call (323) 997-8867.

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Other Sierra Madre locksmith services

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

Master Key System in Sierra Madre — FAQs

What exactly is a master key system?
It is a set of locks arranged in a hierarchy so each door has its own key, groups of doors share a key, and a master key opens all of them. It reduces key clutter while keeping access organized.
Do you offer restricted-key systems in Sierra Madre?
Yes. Restricted keyways make unauthorized copying much harder and support real key control. Call (323) 997-8867 and we can talk through which option suits your doors.
Can a small shop near Kersting Court use a master key system?
Absolutely. Even a few doors can benefit, such as a front entry, a storeroom and an office, each with different people holding keys. We keep the design simple and fitted to the shop.
Can landlords use this for rental cottages?
Yes. Each unit can have its own key with a master for the owner or manager, which makes tenant turnover much easier. A rekey after a tenant leaves is straightforward in this setup.
Can older skeleton-key mortise locks be part of a system?
Sometimes. Many original mortise locks can be retrofitted or rekeyed, while others are better replaced. We look at each lock and tell you honestly which route makes sense.
Will you come up to Sierra Madre Canyon if the lane is narrow?
Yes. If the van must park below, we carry tools and cylinders up on foot. It may affect the job's logistics, but it does not prevent us from doing the work.
What happens if a master key is lost?
Call us right away at (323) 997-8867, any hour. Depending on your system, we may rekey affected locks or change the affected levels instead of replacing everything.
Do I need a storefront visit to set this up?
No. We are entirely mobile with no storefront. We come to your property, plan the system with you and do the 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