What is a master key system, and does your Pasadena property need one?
A master key system is a planned arrangement of locks and keys in which every door has its own key, and one or more higher-level keys open groups of doors or all of them. A tenant's key opens that tenant's door only. A property manager's key opens every unit. A maintenance key opens the utility rooms and nothing else. It replaces the ring of thirty keys with the one or two that match the person's actual job.
It is not for every property. A single-family house or a one-door office does not need one. A system pays for itself when different people need different levels of access to more than one door: a multi-tenant office building, an apartment or condo property, a medical suite, a shop with a stockroom and a back office, a church with a school wing. If you count your doors, count your people, and the two lists do not line up neatly, that is the signal that a hierarchy would help.
Why do keys get out of control in the first place?
Most properties we are asked to look at never had a plan. Keys accumulate. A lock gets replaced after someone leaves, and the new lock comes with a new key. A contractor has a copy made. A tenant moves out and a spare never comes back. Five years later, someone asks who can open the electrical room and nobody can answer with confidence.
The warning signs are usually easy to spot:
- Several different key types on one ring, with nobody sure which opens what
- Keys stamped 'Do not duplicate' that an ordinary key kiosk will still copy
- Former employees, tenants, or contractors who may still hold working keys
- A manager who must carry every key just to reach one door
- No written record of who holds which key
How does a master key hierarchy work?
Inside a standard pin tumbler cylinder, each chamber holds a stack of pins. The right key lifts every stack so the gap between pins lines up at the shear line, and the plug turns. To master a lock, we add thin extra pins in some chambers, which creates a second acceptable alignment. Two different cuts then operate the same lock: the individual key and the master key.
Systems are described in levels:
- Change key: opens one lock or one unit, nothing else
- Master key: opens a defined group, such as every unit on a floor or every office in a suite
- Grand master: opens several master groups, typically held by an owner or property manager
- Great grand master: a fourth level that only makes sense on large multi-building sites
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Call (213) 577-1366What limits how many levels a system can have?
The number of pin chambers, the available cut depths, and the manufacturer's keying rules set the ceiling. Every added level creates extra key combinations that were never intended to work but sometimes do. A well-built system controls this with a bitting chart drawn up before any pin is touched. That is why we design the hierarchy on paper first. A system that grows by improvisation is the one that ends up with surprise keys.
How do we install a master key system, step by step?
The planning is the real product here. Cutting keys is the easy part. This is the order we work in:
- Walk the property, or review floor plans, and list every door, the lock on it, and who needs access to what.
- Check which existing cylinders can be mastered. Many standard pin tumbler cylinders can. Worn or very light-duty hardware sometimes cannot, or is not worth keeping.
- Draw the hierarchy and the bitting chart, and go through it with you so you decide how many levels you really want.
- Choose the keyway: a conventional profile or a restricted one with controlled key blanks.
- Re-pin or replace the cylinders, cut the keys, and test every key on every lock, including confirming that lower-level keys open nothing they should not.
- Hand over the keys, the written key record, and a short key control procedure covering who authorizes copies and how keys are signed out.
- Store the records securely so doors can be added later without starting over.
What are restricted keyways and duplicate-protected keys, and what do they protect?
A restricted keyway uses a key profile whose blanks are not sold freely. The manufacturer controls distribution, and new keys can be ordered only by an authorized dealer with the owner's authorization on file. The result is a duplicate-protected key: you cannot walk into a hardware store and get a copy made. This is the backbone of any serious employee key control system, because it puts the owner, not the key holder, in charge of who gets another key.
Be honest with yourself about the limits. A stamp reading 'Do not duplicate' is a request, not a barrier, and plenty of stamped keys get copied every day. Only a genuinely controlled keyway adds real friction. Restricted also does not automatically mean pick-proof or drill-proof. Copy control and physical resistance are two different features, and if you need both, look at high-security locks alongside the keyway decision. For ordinary, unrestricted keys, our key duplication service is the quick route, and it is a separate job from building a system.
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Call (213) 577-1366What affects the cost of a master key system?
We do not give a flat number over the phone for a system, because the door count and the hardware decide it, not a menu. These are the factors that move the cost:
- Number of doors and how many different lock types are in the mix
- Number of hierarchy levels and how many keys of each level are needed
- Whether existing cylinders can be re-pinned or must be replaced
- Conventional keyway versus restricted keyway, which carries controlled blanks and authorization paperwork
- Condition of the doors and hardware; a latch that does not catch will not be fixed by clever pinning, so commercial door hardware repairs may come first
- Whether the work must happen after business hours
- How much room you want for future doors
Which route is usually more economical?
Re-pinning good existing cylinders into a conventional keyway is usually the more economical route, and it is often the right call for a small suite or a modest apartment building. A restricted system costs more up front but buys real control over copies. We will lay out both options for your doors and let you choose. We would rather tell you a lighter-cost option fits than sell you more system than the property needs.
Where do master key systems make sense in Pasadena?
Pasadena's housing and building mix suits this work well. The city has a dense core of mid-rise condos and apartments around Old Pasadena, the Playhouse District, and the Lake Avenue area, and controlled-access condo and apartment buildings concentrate along the Metro A Line corridor. In buildings like these, the question is rarely whether a hierarchy is needed. It is whether the one in place is still intact. Where a property manager is dealing with repeated lockouts, or the sign-out sheet for unit keys is a memory, a rebuilt system lets the manager's key do its job without every resident's key being exposed. Landlords with several addresses can read more on our locksmith for landlords page.
Retail and office are a second pattern. Shops along Colorado Boulevard and South Lake Avenue typically need a front door, a stockroom, a back office, and sometimes a shared storage space, each with a different set of people allowed through. A three-level key plan, staff, manager, owner, handles that cleanly. The front-door hardware itself is a different job, covered under storefront lock repair.
Pasadena also has numerous designated historic landmark districts where early-1900s door hardware is still in service, and Craftsman streets like Bungalow Heaven are part of that picture. If you manage a small multi-unit property or a converted building with original mortise hardware, we can often re-pin the existing cylinders into a system so the doors keep their character. Whether a particular lock can be mastered is something we confirm by looking at it, not by guessing from a description.
Climate matters too. Pasadena runs hotter than coastal Los Angeles in summer, with Santa Ana wind events off the San Gabriels. Sun and dryness are hardest on wood doors, which shrink and shift, and a door that rubs the frame puts load on a latch and a cylinder. On the northern foothill edge, wind-blown dust is more of a factor than on the flats. Master-pinned cylinders have extra small parts in each chamber, so grit gives them more places to cause trouble. We use a dry lubricant, not oil, and we check door alignment while we are on site. Whether the building sits in 91101, 91103, 91105, or 91107, the plan starts the same way: a door-by-door walk-through.
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Call (213) 577-1366What are the downsides of a master key system?
A master key is a single point of failure. Lose a grand master and every lock it opens is compromised, which can mean rekeying a whole group. More levels also mean more combinations that might accidentally operate a lock, so a loosely planned system is less secure than a simple one. And keys, however well controlled, create no record. A metal key cannot tell you who opened a door at night.
If you need a log of who went where and when, or the ability to cancel one person's access instantly, that is where access control installation comes in, and a mechanical master system plus electronic access on key doors is a common mix. We will tell you honestly which doors need which. For a straightforward key replacement on a single lock, see lock rekeying; that is a different, simpler job than a full hierarchy.
Why call Wilshire Lock & Key for a master key system?
We have been in business since 1987, with a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans that cover Pasadena, about 23 miles from our shop. You deal with one company, not a dispatch service that hands your job to whoever is free. David, the owner and lead technician, oversees the system plan, because a hierarchy built carelessly is expensive to undo.
Our phone is answered 24 hours a day, 7 days a week, year-round, at (213) 577-1366, which matters most when a master key goes missing and you need the doors secured. California requires locksmith companies to hold a BSIS LCO license. Ask any locksmith for that number before they touch your locks or keys, and that includes us. For the full range of business work beyond key systems, see our commercial locksmith page.
Frequently asked questions
How much does a master key system cost in Pasadena?
It depends on the number of doors, the number of levels, whether your existing cylinders can be re-pinned or must be replaced, and whether you choose a restricted keyway. We quote after seeing the doors, not by phone. Re-pinning good existing hardware is usually the more economical route.
Can you convert my existing locks into a master key system?
Often, yes. Many standard pin tumbler cylinders can be re-pinned into a hierarchy. Some very light-duty or badly worn hardware cannot, and we will say so when we inspect it. This is called a master key rekey, and it avoids replacing locks that are still sound.
How many doors do I need before a master key system makes sense?
There is no fixed number. Two doors with three different access levels can justify one. The real test is whether different people need different access to different doors. A single door with one key holder does not need a system.
What is the difference between a restricted keyway and a key stamped 'Do not duplicate'?
The stamp is only a request, and many such keys still get copied. A restricted keyway uses a controlled key profile whose blanks are only supplied to authorized dealers with the owner's authorization on file. That is what makes duplicate-protected keys actually harder to copy.
What happens if a master key is lost or an employee leaves with one?
The affected group of locks is no longer secure, so those cylinders usually need to be re-keyed to a new hierarchy. Call us as soon as you know. The phone is answered around the clock, and we will secure the most sensitive doors first.
Can an apartment building use a master key system and still keep each tenant's key private?
Yes. That is the standard setup for an apartment master key system. Each tenant's change key opens only their unit, while the manager's master opens all units. Restricted keys add control over who can order extra copies of the tenant keys.
Does a master key system work with keypads or smart locks?
A master key system is mechanical. Keypad and smart locks operate separately, though many properties combine them, keeping keyed cylinders on most doors and electronic access on a few. We look at the whole door list and recommend what fits where.
How long does installation take?
It depends on how many doors there are and whether the work is re-pinning or replacement. A small suite can often be handled in a single visit. Larger buildings are done in stages, door by door, so the property stays secured each night.
Do you handle master key work at night or on weekends?
Our phone is answered 24 hours a day, 7 days a week, so a lost master key or an urgent security change can be reported any time. Planned installations are normally scheduled with you, including after hours if business operations require it.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.