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Crenshaw Lock

Master Key System in San Dimas · 24/7 mobile

Master Key System in San Dimas, California

Crenshaw Lock Company designs and installs master key and restricted-key systems with key control for San Dimas, California properties. We are a fully mobile locksmith available 24/7, and we come to you. For a consultation on your building or property, call (323) 997-8867.

  • Mobile to your San Dimas 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 each person carries only the keys they need. In San Dimas that can mean a Bonita Ave retail owner with a front door, stockroom and office, an HOA managing common-area gates and clubhouse doors, or a landowner with a house, barn, tack room and gated drive that all use separate padlocks and keys.

The city has a mix of property types that rarely suit one-size-fits-all hardware: small retail and civic buildings in Old Town, ranch-style homes from the 1960s and 70s, larger lots and outbuildings near San Dimas Canyon and Bonelli Park, and planned-community housing in Via Verde. Each calls for a different key plan, and we design around how your property is actually used.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987 under owner and lead technician David Shar. We are mobile only, with no storefront. We meet you at the property, look at the doors and hardware in person, and build a system you can manage for years.

How it works in San Dimas

  1. 1

    Walk the property and talk through access needs

    We come to your San Dimas location and go through every door, gate and padlock point. You tell us who needs access to what: owners, managers, employees, ranch hands, contractors, cleaners. We note the existing hardware and what can be reused.

  2. 2

    Design the key hierarchy

    We map out the levels of the system: a grand master if needed, master keys for groups of doors, and individual change keys. We explain trade-offs plainly, including that more levels mean more complexity and a bit less security margin, so you can choose with clear information.

  3. 3

    Choose the hardware and key control level

    We select cylinders and padlocks suited to your doors, gates and weather exposure. For tighter control, we discuss restricted keyways, where duplication is limited to authorized people, rather than keys any hardware store can copy.

  4. 4

    Install and rekey on site

    Because we are mobile, we pin or replace cylinders at your property, test every key against every lock, and confirm that each key opens only what it should. Existing locks are rekeyed into the system where practical.

  5. 5

    Document and hand over the system

    You receive a key schedule that records which keys open which doors and who holds them. We go over how to issue, track and retrieve keys, and how to add doors or users later without starting over.

  6. 6

    Support as the property changes

    Staff turn over, tenants move and buildings expand. We can rekey, add cylinders or cut additional keys under the same system, any time of day, since we operate 24/7.

Need master key system in San Dimas?

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, gates and padlocks that need to be included in the system.
  • How many levels the key hierarchy has, such as individual, master and grand master keys.
  • Whether existing hardware can be rekeyed or cylinders need to be replaced outright.
  • The level of key control you want, from standard keyways to restricted keyways with duplication limits.
  • Exposure and durability needs, such as weather-rated padlocks for barns, outbuildings and gated drives.
  • How many keys are needed and whether the work is scheduled in advance or arranged on short notice.

Why San Dimas chooses us

  • Fully mobile service: we bring the tools and cylinders to your San Dimas property and finish the work there.
  • Operating since 1987, with owner David Shar leading the work rather than handing a commercial system to an unknown crew.
  • Systems designed around real use, whether that is a Bonita Ave storefront or a horse property with a barn and gated drive.
  • Clear written key schedules so you always know which keys open which locks.
  • Honest advice on complexity: we will tell you when a simpler layout serves you better than a deep hierarchy.
  • Available 24/7 for urgent changes, such as a lost master key or a departing employee.

Master Key System across San Dimas

San Dimas is not a single kind of property, and a good master key system reflects that. In the western-themed downtown on Bonita Ave, small shops and civic buildings often need a simple two-tier arrangement: staff keys for the front and back doors, and an owner or manager key that opens everything, including storage and office doors. Older storefront doors can limit hardware choices, so we check each door before recommending anything.

Near San Dimas Canyon and the edges of Frank G. Bonelli Regional Park, larger lots with horse-keeping zones bring barns, tack rooms, outbuildings and gated drives into the picture. Padlocks there face dust, sun and moisture, so we look at keyed-alike padlocks that share one key across gates and sheds, with a separate key for the house. In the Via Verde hillside community, HOA-standard hardware and shared amenities call for a plan that fits association rules and allows clean key handoffs when management changes.

We serve ZIP code 91773 and the surrounding area, reaching properties off Arrow Hwy, San Dimas Ave, Bonita Ave and Foothill Blvd, and near the I-210, SR-57 and I-10 corridors. Whether you are near Puddingstone Reservoir, Raging Waters or the canyon, call (323) 997-8867 and we will come to you.

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Other San Dimas locksmith services

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

Master Key System in San Dimas — FAQs

What is a master key system?
It is a lock arrangement where each lock has its own key, and a higher-level master key can open a defined group of locks. It reduces the keys people carry while letting managers keep control. Call (323) 997-8867 to discuss a layout for your property.
Can a master key system work for a small Bonita Ave business?
Yes. Even a shop with a front door, stockroom and office can benefit from staff keys that open only some doors and an owner key that opens all of them. We look at your doors in person first.
Can you set up one key for my house, barn and gates?
We can key padlocks and cylinders alike so one key covers the barn, gates and outbuildings, with a separate key for the house if you prefer. This suits horse properties near San Dimas Canyon.
What is a restricted key system?
It uses a keyway that is not freely available, so keys cannot be copied at ordinary hardware counters without authorization. It adds key control and helps prevent unauthorized duplicates.
Can my existing locks be added to the system?
Often yes. Many cylinders can be rekeyed to join a system, though some older or incompatible hardware may need replacement. We check on site and tell you which is which.
Can an HOA or property manager use a master key system?
Yes. Systems for common doors, gates and shared rooms work well with a documented key schedule, so keys can be reassigned when board members or managers change. Call (323) 997-8867 to talk it through.
What if a master key is lost?
Tell us quickly. Depending on the system, we can rekey affected locks or restructure the hierarchy so the lost key no longer works. We are available 24/7 for exactly this situation.
Do you have a shop I can visit?
No. We are fully mobile and come to your San Dimas location. Reach us any time at (323) 997-8867 to arrange a 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