What is a master key system, and what is it not?
A master key system is a planned layout of keys and locks. Every door gets its own key, called a change key, that opens only that door. Above those sits a master key that opens a defined group of doors. Larger systems add a grand master above that, and sometimes a great grand master. The structure is a hierarchy, and the point is that nobody carries a ring of fifteen keys just to do their job.
It is not the same as keying every lock alike. Keyed-alike hardware means one key opens everything, which is fine for a house with a front door, back door and garage, but a poor fit once different people need different access. A master system lets a tenant, a department or a shift supervisor open only what belongs to them, while the owner or property manager can open all of it.
It is also not a product you pull off a shelf. The hierarchy has to be drawn on paper before any cylinder is touched, because every decision about who opens what is baked into the pinning of each lock. That is why we start with a conversation and a walk through your doors rather than a parts list.
- Change key: opens one door only
- Master key: opens a defined group of doors
- Grand master: opens several groups, usually held by ownership or management
- Restricted keyway: a key profile whose blanks are not freely sold, so copies are harder to get made
Who in Chatsworth needs a master key system?
The honest answer is anyone whose key ring has outgrown their memory. In practice that tends to be a handful of situations: a building with several tenants or departments, a business with employees who open and close at different times, a property with many units under one manager, or an owner who has simply lost track of who holds what after years of hand-me-down keys.
If you only have a few doors and one or two people, a master system is probably more structure than you need. In that case a plain rekey, covered on our lock rekeying page, gets every door onto one fresh key set and costs less in planning time. We would rather tell you that on the phone than sell you a hierarchy you will never use.
- Multi-tenant office-flex or warehouse buildings with separate suites
- Businesses with managers, staff and cleaning crews needing different access levels
- Townhome and condo associations or landlords with many similar doors
- Properties with a house, gate, garage and outbuildings that need layered access
- Any site where a former employee or contractor still has a key you cannot account for
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Call (213) 577-1366How do we set up a master key system? Step by step
The work is mostly planning, and the planning is what separates a system that holds up for decades from one that becomes a headache in two years. Here is how a typical job runs, whether it is a small shop or a multi-building site.
- Walk the site. We count every door, note the existing hardware, and identify which locks can be master keyed and which would need new cylinders.
- Build the hierarchy with you. You tell us who needs access to what; we draw the levels, from individual doors up through the master tiers, and flag anything that looks like a security weak point.
- Choose the keyway. We discuss whether a standard keyway is enough or whether a restricted keyway with duplicate-protected keys makes sense for your building.
- Create the key schedule. This is the written record of how every lock is pinned and which key opens it. It is what makes future additions possible without guesswork.
- Install or rekey the cylinders. Existing hardware that can take a master pinning is rekeyed; hardware that cannot is replaced with cylinders that can.
- Cut and test keys. Every key is tried in every lock it should and should not open, so errors surface before we leave.
- Hand over keys and records. You get a clear list of who holds what, plus guidance on how to authorize future copies.
Restricted keyways and duplicate-protected keys: when are they worth it?
A standard key can be copied at nearly any hardware store kiosk in a couple of minutes, with no questions asked. That is convenient for a family house and a problem for a business trying to control who has access. A restricted keyway changes the equation. The key profile is controlled, the blanks are not sold over the counter, and copies generally require authorization from the account holder. Duplicate-protected keys add that paperwork layer on top of the hardware.
This is the core of a real key control system. Without it, a master key system controls who can open a door today, but not who can quietly make a copy tomorrow. With it, you decide who is allowed to order keys, and an employee cannot walk a key into a shop and come back with a second one.
Restricted systems are not free of tradeoffs. Ordering additional keys takes a little more deliberate effort, which is the whole idea, and you will need to keep track of who is authorized. For a site with a handful of staff and nothing valuable inside, a standard keyway with good record keeping may be enough. For a warehouse, a shared building, or anywhere with inventory, files or equipment, we usually recommend looking seriously at restricted keys. Our high-security locks page covers the hardware side in more detail.
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Call (213) 577-1366What about employee key control?
Hardware alone does not control keys; habits do. The most common failure we see on commercial properties is an old key set that nobody can fully account for. A good employee key control system pairs the hierarchy with a few simple practices.
Keep a signed key log that records who received which key and when. Give each person the lowest level of access that lets them do their job. Collect keys at departure and treat an unreturned master key as a reason to rekey the affected group, which is far easier on a master system than on a pile of unrelated locks. Stamp or code keys so they cannot be casually duplicated, and keep the key schedule somewhere secure rather than in an open drawer.
If your needs have moved past keys altogether, for example when you want to turn off one person's access without touching a lock, access control installation may fit better. Many sites end up using both: mechanical master keys for most doors and electronic access for the doors that matter most.
How much does a master key system cost in Chatsworth?
We do not quote a figure before we have seen the doors, because the range between a simple system and a complex one is wide. What moves the cost is fairly predictable, and we are glad to walk through each factor so you know what you are paying for.
Where a quote lands usually comes down to these things:
- Number of cylinders. More doors means more cylinders to pin and test.
- Number of levels. A two-tier system is simpler than one with grand and great grand masters.
- Condition of existing hardware. Cylinders that can be rekeyed cost less than ones that must be replaced, and worn or damaged locks may need repair first.
- Keyway choice. A restricted keyway with duplicate protection costs more than a standard keyway, but it is what makes the system genuinely controlled.
- Number of keys. Every change key, master and spare has to be cut and checked.
- Door types. Standard office doors, roll-up doors, gates and cabinet locks may each need different cylinder styles.
- Planning and records. A proper key schedule takes time to create, and it is part of the value.
- Timing and travel. A scheduled daytime install differs from an after-hours call to a site outside our usual routes.
Master key systems around Chatsworth: what we see locally
Chatsworth has a few very different property types, and each one asks something different of a master system. In the De Soto Avenue industrial corridor, warehouses and office-flex buildings often mix a front office, tenant suites, mechanical rooms and roll-up doors. A layered system lets a building owner hold a grand master while each tenant has a master for their own suite, and we can pair that with commercial locksmith work on the doors and hardware themselves.
Along Devonshire Street in Old Town Chatsworth, the situation is usually smaller: a shop owner or two-location operator who wants staff to open the front and back but not the office or stockroom. That is a simple two-tier setup, and a restricted keyway is often the part worth considering, since it stops casual copying.
Residential and mixed-use properties have their own pattern. A complex like the Rockpointe townhome community has many similar doors, shared areas and an association or manager who needs access to common spaces without carrying a key to every unit. Out toward the Santa Susana Pass foothills and gated equestrian areas such as Monteria Estates, a single owner may have a house, a driveway gate, a detached garage and a barn, each with its own hardware. A small hierarchy can let family use one key while a ranch hand or property manager opens only the barn and gate.
Climate matters too. Chatsworth is one of the hottest parts of the San Fernando Valley in summer, and Santa Ana winds push wind-blown grit and dust through the pass in fall. That grit works into exterior cylinders and gate hardware over time. A master-keyed cylinder has more internal parts than a standard one, so it is less forgiving of dirt and wear. We pay attention to cylinder condition on exterior doors and gates during planning, and we may recommend repairs first, which is where our gate lock repair work comes in.
For anyone in ZIP code 91311, we run mobile service from our vans, with our storefront at 10740 Wilshire Blvd in Westwood as the base. Chatsworth is about 26 miles from that shop, so we plan master key jobs ahead where we can and bring the cylinders, tools and key blanks the plan calls for.
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Call (213) 577-1366Apartment and rental property master key systems
An apartment master key system is one of the most common uses, and it has a very specific logic. Each unit gets a change key that opens its own front door and nothing else. A building master opens every unit and common area for the manager or owner, with a separate key for maintenance if you prefer to limit access. Laundry rooms, mailrooms and trash enclosures can be set on their own group so residents use them without touching anyone's front door.
The practical benefit is turnover. When a tenant leaves, you rekey that one unit and the master still works afterward, so there is no scramble to re-cut keys for everyone. For owners who manage several buildings, we can lay out a master hierarchy across properties so one person can reach everything and a building supervisor reaches only their own site.
If you own or manage rentals, our locksmith for landlords page covers turnover rekeys and property-wide planning. A caution we give every landlord: a master system does not replace tenant privacy rules. You still need to follow California notice requirements before entering a unit, and that is a legal matter rather than a locksmith one.
Why call Wilshire Lock & Key for a master key system?
Master keying is detail work, and a mistake in the plan shows up years later when someone's key opens a door it should not. A few things set our approach apart.
- In business since 1987. We have been planning and rekeying key systems for a long time, and it shows in how we think through the hierarchy before cutting anything.
- Storefront plus mobile vans. We have a physical shop at 10740 Wilshire Blvd and vans that come to you, so work is not limited to what fits in a truck.
- One company, no dispatch middlemen. When you call (213) 577-1366, you are dealing with our company, not a call center that sells the job to whoever is closest.
- David's oversight. Our owner and lead technician, David, oversees the work, so the plan, the key schedule and the finished system get a close look from someone with a stake in the result.
- Straight advice. If a plain rekey or keyed-alike set fits better than a full master hierarchy, we say so.
- A clear license note. California requires locksmith companies to hold a BSIS locksmith company (LCO) license, and you should ask any locksmith, including us, for license details before work begins.
How do I get started?
Call (213) 577-1366. The line is answered 24 hours a day, every day of the year, so you can describe the property whenever it suits you. Tell us how many doors you have, what kind of building it is, and who needs access to what, and we will tell you what a sensible hierarchy might look like and what a site visit should cover.
If you prefer to write first, use our contact page and include rough door counts and any hardware concerns. Whatever route you take, bring any existing keys and a floor plan or sketch if you have one. It speeds up the planning and helps us spot problems before we are on site.
Frequently asked questions
Can any lock be master keyed?
No. Many pin tumbler cylinders can be, but some inexpensive or worn locks cannot take the extra pinning, and certain specialty hardware has its own limits. During the site walk we identify which of your existing locks can be converted and which need new cylinders.
Does a master key system make my building less secure?
It can if it is poorly designed. Every additional level adds some mechanical tolerance, and badly planned systems can allow unintended key combinations to open doors. A well-planned system, kept simple and paired with a restricted keyway, controls risk. We tell you where we see weak points in your layout.
What is a restricted keyway?
It is a key profile whose blanks are not sold freely, so copies cannot be cut at just any shop. Duplicate-protected keys usually add an authorization step, meaning only the account holder or named people can order more. It is the main tool for real key control.
Can you add doors to my master key system later?
Usually yes, provided we have the key schedule and the original keyway is still available. That is why the written schedule matters. Without it, adding doors can mean starting the hierarchy over, so keep it somewhere secure.
What if an employee leaves with a master key?
Treat it seriously. On a master system you rekey the affected group of doors rather than the whole building, which is usually more manageable than rekeying a pile of unrelated locks. If the lost key sits high in the hierarchy, more doors are involved. Call us and we will help you scope it.
Is a master key system a good fit for a small Old Town Chatsworth shop?
Sometimes. If you have a front door, back door and an office or stockroom with different people needing different access, a simple two-tier system works well. If everyone needs the same doors, a plain rekey or key duplication approach may be more sensible.
How long does a master key installation take?
It depends on door count, hardware condition and the number of levels. A small system is quicker than a multi-building one, and planning takes longer than the physical work. We give you a realistic scope after seeing the site rather than a rushed promise over the phone.
Do you handle master keying for gated properties and barns near the Santa Susana foothills?
Yes. Gates, detached garages and barns often use different hardware than the house, so we look at each piece first. Dusty, wind-exposed locks may need cleaning or repair before they can be pinned to a master. We confirm what can be combined when we see the hardware.
Do you need to see the property before quoting?
For a real master key system, yes. We can describe the process and the cost factors by phone, but door count, hardware condition and your access needs determine the plan. A site visit lets us give a quote that reflects your actual building.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.