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Crenshaw Lock

Master Key System in Duarte · 24/7 mobile

Master Key System in Duarte, California

Crenshaw Lock Company designs and installs master key and restricted key systems with real key control in Duarte, California. Our fully mobile team is available 24/7 and comes to your building, office, or property. Call (323) 997-8867 to plan a system that fits how your people actually move through your doors.

  • Mobile to your Duarte 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 one key open many doors while individual keys open only their own. Done well, it replaces a ring of a dozen keys with one, and it lets an owner decide exactly who can go where. Done badly, it creates confusion, lost keys nobody can trace, and security gaps. Crenshaw Lock Company has been doing lock work across Greater Los Angeles and Ventura County since 1987, and owner David Shar's approach to master keying starts with a conversation about people and doors, not with a box of cylinders.

Duarte has a mix of properties where this matters. The City of Hope medical campus draws a large professional population and a cluster of nearby offices and clinics. Along Huntington Drive (Route 66) and Mountain Avenue there are small businesses, shared suites, and professional buildings. Newer condos and apartments near the A Line have common areas, utility rooms, and mailrooms that need tiered access. Even a landlord with several rental units or a homeowner with a main house, guest unit, and workshop can benefit from a system.

We are fully mobile. There is no storefront to visit. We come to you in Duarte, walk the property with you, and build the system on site, so the plan is based on the doors you really have instead of a guess from a phone call.

How it works in Duarte

  1. 1

    Walk the property and map the doors

    We start by visiting your building and listing every door, gate, cabinet, and utility space that needs a lock. We note the existing hardware, door type, and condition, because some locks can be re-pinned or replaced to join the system and others are better swapped out.

  2. 2

    Define who needs access to what

    Next we talk through the people involved: owner, managers, staff, tenants, maintenance, cleaners, or vendors. We sketch an access hierarchy, such as individual keys, group keys, and a top-level master, so each person carries only the key they need.

  3. 3

    Choose a keyway and level of key control

    A standard keyway is fine for some properties. Others need a restricted keyway, where blanks and duplication are controlled so keys cannot be copied at a hardware store counter. We explain the tradeoffs in plain terms and match the choice to your risk and budget.

  4. 4

    Install and pin the cylinders

    We install or rekey the cylinders on site and pin them to the agreed hierarchy. Each lock is tested with its own key, its group key, and the master to confirm that every key opens what it should and nothing it should not.

  5. 5

    Cut and label keys, record the system

    We cut the keys, mark them with a code rather than a door description, and give you a clear key schedule showing who holds what. Keeping that record is what turns a set of keys into actual key control.

  6. 6

    Plan for growth and changes

    Staff turn over and spaces get reconfigured. We leave the system designed so new doors can be added and a lost key can be dealt with, often by rekeying a group instead of the whole building.

Need master key system in Duarte?

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What affects the price

  • The number of doors, gates, and cabinets that need to join the system.
  • How many levels the hierarchy has, such as individual, group, and grand master access.
  • Whether you choose a standard keyway or a restricted, patent-protected keyway with duplication control.
  • The condition and type of existing hardware, and whether cylinders can be re-pinned or locks must be replaced.
  • The number of keys to be cut and whether you want a stamped, tracked key program.
  • Whether the work is scheduled in advance or needed urgently outside normal hours.

Why Duarte chooses us

  • Fully mobile service: we work at your Duarte property, so the design is based on your real doors.
  • Operating since 1987, with a long track record on commercial and multi-unit lock work around Los Angeles County.
  • Owner-led: David Shar is involved in the planning, not just a rotating crew.
  • We explain restricted keyways and key control honestly, including when a simpler system is the better fit.
  • You receive a key schedule so the system can be understood and managed later.
  • Available 24/7, so if a key goes missing or a door fails, you can reach us any time.

Master Key System across Duarte

In Duarte, master keying shows up in more places than people expect. Near City of Hope, medical offices, clinics, and professional suites often need staff access, restricted storage, and supply rooms, all on different permission levels. A restricted keyway can be especially useful where supplies or records are involved. Properties off Huntington Drive and Mountain Avenue, in ZIP code 91010, are often small multi-tenant buildings where each tenant needs private access while the owner or manager holds a master.

Residential-style properties benefit too. In the older Butler and Cotter areas, 1950s and 1960s ranch homes sometimes become rentals, duplex conversions, or home offices, and a landlord may want a single key for common doors and separate keys for each unit. Up toward Royal Oaks and the Fish Canyon area, in ZIP code 91010 and nearby 91009, larger custom homes with gates, guest houses, and outbuildings can be tied into one organized system instead of a drawer of mismatched keys.

Whether you are close to I-210, off Buena Vista Street, or near Encanto Park, we come to you. Call (323) 997-8867 and we will talk through the property before anyone picks up a tool.

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Other Duarte locksmith services

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

Master Key System in Duarte — FAQs

What is a master key system?
It is a lock arrangement where each lock has its own key, and a higher-level key can open a group of locks or all of them. It reduces the number of keys people carry while keeping control over access.
Can you convert my existing locks in Duarte to a master key system?
Often yes. Many cylinders can be re-pinned to join a system, while some older or low-quality locks are better replaced. We assess your hardware on site. Call (323) 997-8867 to schedule a visit.
What is a restricted key system?
It uses a keyway where blanks and duplication are controlled, so keys cannot be copied casually. It is a good fit for medical offices, shared suites, and any property where unauthorized copies are a concern.
Is a master key system a good idea for a small office near City of Hope?
It can be, especially if you have staff with different access needs, supply or records rooms, or multiple tenants. We will tell you honestly if a simpler setup would serve you better.
What happens if someone loses a key?
It depends on the key level. A lost individual key may only require rekeying that one lock, while a lost master is more serious and may call for rekeying a larger group. Call (323) 997-8867 any time and we will help you decide.
Do you have a shop I can visit?
No. We are fully mobile and come to your location in Duarte, which lets us design the system around your actual doors.
Can I add doors to the system later?
Yes. A well-planned system leaves room to expand, so new doors, tenants, or buildings can be added without starting over.
Can a landlord with a few rental properties use a master key system?
Yes. Landlords commonly use one so each tenant has a private key while the owner or manager can access units when needed and common areas stay organized.
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