Master Key System in Los Angeles: design, installation and key control

What a master key system is, and what it is not

A master key system is a plan for who can open what. Every lock in the building has its own key, called a change key. On top of that, one or more higher-level keys open groups of those locks, or all of them. The tenant in unit 4 opens unit 4. The property manager opens every unit. The owner opens everything, including the manager's closet.

What makes it work is inside the cylinder. A standard lock has one shear line, and one cut of key lifts the pins to it. A master-keyed lock is built so that two different key cuts lift the pins to the shear line: the change key and the master. We get that second cut by adding thin master pins between the regular pins. That is all the magic there is. The skill is in laying out a hierarchy so that it stays workable for years.

It is also not the same as an electronic access system. A master key system is mechanical. There are no batteries and no software, and nothing to log who opened what. If you need audit trails or you want to cancel a lost credential instantly, that is a different tool, and we explain where the line falls further down.

Situations that lead to this call

Most people who call us about a master key system are not shopping for one in the abstract. Something happened, or something is about to.

• A building has grown a pile of keys. Over the years, locks were swapped one at a time and nobody kept a record, so the manager carries a ring nobody can fully explain.
• A tenant or employee left and nobody got the key back, or nobody is sure they did.
• A new property, a renovation or a change of ownership means every lock should start from a known state.
• An apartment owner wants one key for the manager and maintenance, while each unit stays private.
• A business with several departments needs the front-of-house staff to reach the shop floor but not the office, and the office to reach everything except the stockroom.
• An existing system was built badly, with too many levels or too many cross-keyed locks, and keys meant for one door now open doors they should not.
• A company wants keys that cannot be copied at a hardware store kiosk, which points toward a restricted keyway and duplicate-protected keys.

How we design the hierarchy before touching a lock

The design is where a master key system is won or lost. Cutting cylinders is routine once the plan is right. When we start a project, we walk the building or review the floor plan, and we ask questions that sound simple and are not.

• Who needs to open what, and who needs to be kept out of what?
• Which doors are shared, such as stairwells, mail rooms, laundry rooms and utility closets?
• How many people will realistically hold each level of key?
• How likely is the layout to change in the next several years?
• Are there doors with hardware that will not accept a standard cylinder?

Levels, bitting and why bigger is not always better

A hierarchy is described in levels. The simplest has change keys and one grand master. A larger system adds master keys for zones, floors or departments between them. Each added level means more master pins in the cylinders, and more master pins mean more false key combinations that happen to open a lock. A system with too many levels and too many locks becomes easier to defeat and harder to manage.

So we aim for the simplest hierarchy that does the job. We build a bitting list, which is the written record of every key cut assigned to every lock. That record is what lets a system be expanded later without breaking what already exists. We hand over a copy and explain how to store it. Whoever holds that record effectively holds the system, so it should be treated like a set of master keys itself.

How the installation is done, step by step

Here is the actual sequence on a typical conversion from standard locks to a master-keyed set.

1. Survey every opening and note the lock type, cylinder format, door condition and whether the hardware is in good enough shape to be worth keying.
2. Agree the hierarchy and the bitting list in writing, including how many keys of each level will be cut.
3. Remove the cylinders or cores from the doors. On many commercial locks this is a quick job. On others the lock body has to come apart.
4. Pin each cylinder to its assigned combination in the shop or on the van, using a pinning kit, plug followers and a key machine for cutting. The plug follower keeps the springs and pins from spilling when the plug comes out.
5. Cut the change keys and the master keys, then test every key in every lock it should open, and every key in every lock it should not.
6. Reinstall the cylinders, check that the bolt throws freely and that the door closes and latches properly, and tag and sort the keys by level.
7. Hand over the key set, the bitting record and a short explanation of how to issue and track keys going forward.

What a pro checks that a quick rekey can miss

Testing is the part most people never see. A master pinned cylinder can have a key that opens it by accident, a cut that was not intended to work but does. We test for those. We also check whether the new keys bind in older, worn locks. A lock that has been sticking for years will sometimes stick worse after being pinned with master wedges, and the right call can be to replace that cylinder rather than live with it.

We also look at the door itself. A beautifully keyed system on a door that can be pried open or that does not latch is not security. That is part of why we often work alongside commercial door hardware repairs when we are on site.

Restricted keyways and duplicate-protected keys

A restricted keyway is a key profile that is not sold openly. The blanks are controlled by the manufacturer and released only through authorized dealers, usually against an authorization card that names the people allowed to order copies. The idea is straightforward: if a key cannot be copied at a kiosk, a lost or borrowed key is far less likely to be duplicated without you knowing.

Some restricted systems add legal protection on the keyway design, and some add only a tighter distribution process. We tell you which type you are getting before you commit, because the strength of that protection varies between product lines.

Restricted keys also change the workflow. Extra keys are not same-day walk-in jobs in the way standard keys are, because copies go through the authorization process. For a business that needs to issue keys to new hires, that is a feature. For a landlord who loses keys often, it is a cost in patience. We ask which you are before we recommend it.

How hardware and key types change the job

No two buildings are the same, and the hardware drives the work.

• Standard pin tumbler cylinders are the most common and the most flexible to master-key. Mortise cylinders, rim cylinders and key-in-knob locks all take the same approach, but each has its own cylinder format.
• Interchangeable core locks let us swap an entire cylinder with a control key instead of disassembling the lock. That makes later changes much quicker, and it is a strong choice for buildings that expect staff turnover.
• Padlocks, cabinet locks and gate locks can often be added to the same system if they use a compatible keyway. Some cannot, and we say so.
• Older or low-grade locks often have no master-keying option at all. Replacing them is sometimes cheaper in effort than trying to make them behave.
• Electronic and keypad locks are a separate category. Where a door needs both a mechanical override and electronic credentials, we plan the override to fit the master key hierarchy. For larger credential-based setups, see our access control installation work.
• Panic hardware and door closers do not change the keying, but they affect how a door must be handled on a job. Exit devices often have their own cylinders that need to be integrated into the plan.

Honest limits: when a master key system is the wrong tool

A master key system will not tell you who used a key. It will not cancel one lost key without rekeying the locks it opens. If a grand master goes missing, the exposure is every door it opens, and the fix is rekeying all of them. Anyone expecting individual credential control should consider access control instead.

It will not make a weak door strong. If the frame is flexing or the strike is loose, the keying does not matter. It also does not suit every building. A small office with three doors rarely needs more than a clean rekey, and a master system there adds complexity for no benefit. In that case we say so and do the lighter-cost job.

And there are cases where the right answer is a different kind of service entirely: a broken storefront lock, a failing closer, a damaged exit device. Those are repair jobs, not keying jobs, and we handle them under their own services. If you are not sure which situation you are in, our commercial locksmith team can look at the building and tell you plainly.

What affects the price of a master key system

We do not quote numbers on a web page, because the honest answer depends on the building. These are the factors that actually move the cost:

• The number of cylinders, since every one is pinned, cut and tested individually.
• The number of levels in the hierarchy and the number of keys cut at each level.
• The condition and type of existing hardware, and whether cylinders can be reused or need replacing.
• Whether you choose a standard keyway or a restricted one with duplicate-protected keys.
• Whether the locks are interchangeable-core, which costs more at the start and saves time later.
• Whether the work is a new system, a conversion of an existing one, or an expansion to a system you already have.
• The amount of design work and record keeping, which grows with building size and complexity.

Why call Wilshire Lock & Key

We have been in business since 1987, and master keying has been part of the trade the whole time. David, the owner and lead technician, oversees the work. We run a storefront at 10740 Wilshire Blvd in Westwood and mobile vans, so cylinders can be pinned in a shop and tested on a door, or handled on site when that makes more sense.

You deal with one company. There is no dispatch center passing your job to whichever subcontractor picked it up, so the person who designs the hierarchy is part of the company that cuts the keys and answers the phone later. When a key goes missing six months on, you call the same number and talk to people who know what was built.

California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith, including us, for the license number before work begins. You can see how pricing generally works on our pricing page.

Where we build and service master key systems

We cover 140 cities across Los Angeles County and Ventura County. The full list is on our locations page. The craft described here applies everywhere, but buildings differ from one area to the next, so each city page covers local detail.

If you are in the city itself, see master key systems in Los Angeles. On the coast, there is a page for Santa Monica. In the San Gabriel Valley, our Pasadena master key page is the closest match.

If your city is not named, call anyway. Our phones are answered 24 hours a day, 7 days a week, at (213) 577-1366.

Master Key System near you

• Los Angeles
• Beverly Hills
• Santa Monica
• Culver City
• West Hollywood
• Sherman Oaks
• Marina del Rey
• Ladera Heights
• Encino
• Inglewood
• Studio City
• View Park–Windsor Hills
• Van Nuys
• Lake Balboa
• All service areas

Related services

• Commercial Locksmith
• Storefront Lock Repair
• Commercial Door Hardware
• Panic Bar Installation
• Door Closer Repair
• Access Control Installation

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