What is a master key system, and who in Lakewood needs one?
A master key system lets different keys open different sets of locks, with a defined order of authority. A tenant's key opens one apartment. A maintenance key opens every apartment in a building. The owner's key opens everything. Nobody carries a ring of twenty keys, and nobody holds more access than the job requires.
In Lakewood, the people who ask us about this are usually one of a few types: a property manager with an apartment building, a business owner with a storefront plus back office plus storage room, a landlord who has taken on several rental properties, or an organization with staff who share a building. If you only have one front door and one back door, you almost certainly do not need a master key system, and we will tell you so. A simple rekey is the better fit there.
What you are buying is not just hardware. It is a plan for who can open what, written down and built into the cylinders. That plan is the part that matters, and it is where we spend the first conversation.
The problem: keys that nobody can account for
Most key trouble is not a break-in. It is slow drift. An employee leaves and never returns a key. A contractor was handed a copy three years ago. A tenant moves out and the lock is never changed. A manager has a key that fits some doors but not others, so someone keeps a second ring in a desk drawer. After a few years, nobody can say with confidence how many working keys exist.
Ordinary keys make this worse because any hardware store can copy them. The person who holds a key can hand it to someone else, and you will never know.
- Too many keys on one ring, so staff leave doors propped or unlocked.
- No record of who holds which key, so a lost key means guessing which locks are affected.
- Unrestricted keys that can be copied at any kiosk without your permission.
- Locks from different years and different manufacturers that cannot be keyed together.
- Changing one lock means changing a pile of keys, so people put it off.
How does a master key system actually work?
Inside a standard pin tumbler lock, a row of pin stacks must line up at one point, called the shear line, before the cylinder turns. In a single-key lock there is one such alignment. In a master keyed lock, we add thin extra pins, so a second key cuts a different, valid alignment. Both keys turn the lock. Neither is a copy of the other.
The levels, from narrowest to broadest, look like this:
- Change key: opens one lock or one group, such as a single apartment or a single office.
- Master key: opens every lock in a defined group, such as all units on one floor or all offices in a suite.
- Grand master key: opens several master groups, for instance every building on a multi-building property.
- Control key: a special key used to remove and swap a cylinder core, kept by whoever manages the system. It applies to interchangeable-core hardware.
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Call (213) 577-1366How we set up a master key system, step by step
We build each system from your doors and your people, not from a template. Here is how the work normally goes.
- Walk the site. We count every door, note what hardware is already there, and check which cylinders can be master keyed and which need replacing.
- Map your access. We ask who needs to open what: owner, manager, maintenance, cleaning, tenants, seasonal staff. We write it out as a simple chart.
- Choose the number of levels. We keep the hierarchy as shallow as the job allows, because every extra level adds some complexity and some security tradeoff.
- Pick the keyway. We decide whether a standard keyway is fine or whether a restricted keyway with controlled key blanks is worth it for your situation.
- Build and install. We pin or rekey the cylinders to the plan, install new ones where needed, and test every key against every lock it should and should not open.
- Hand over the records. You get the key chart and a clear explanation of how to authorize new keys, so the system survives staff changes.
Restricted keyways and duplicate-protected keys: what they do and what they don't
A restricted keyway is a cylinder profile whose key blanks are not sold over the counter. Copies are normally cut only through an authorized dealer who checks for your authorization first. Many restricted systems also stamp the key with a do-not-duplicate marking, and some are protected by patents on the key design. Patent protection differs between product lines, so we explain the specifics of whatever we recommend for your site.
What this gives you is control over copying. A key cut at a kiosk down the street is far less likely to be possible, and any new key goes through a person you named. That matters for employee key control, where the real risk is quiet copying rather than force.
What it does not give you: it is not a force-proof door. A restricted keyway does nothing about a weak door frame, a loose strike plate, or a cheap latch. It also does not make lost keys harmless. If a restricted key goes missing, the cylinder may still need to be rekeyed. For high-risk openings, we may suggest pairing it with hardware from our high-security locks work. For walk-in copy requests on ordinary keys, our key duplication service is separate.
Employee key control: the policy matters as much as the hardware
A key control system is half hardware, half habit. We can install the most careful system possible, and it still erodes if keys are handed out casually. So we help you set a few plain rules alongside the install.
Keep a written log of every key issued, with the holder's name and date. Give each person the lowest level that does their job. Collect keys at departure, and check them against the log. Name one person who is allowed to authorize copies. If a master key is lost, treat it seriously, since it opens many locks at once.
If your doors also need electronic tracking, such as who entered and when, a key system alone will not do that. That is the point where access control installation becomes the right conversation, and many sites use both: keys for storage rooms and utility doors, electronic credentials for the main entrances.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How much does a master key system cost in Lakewood?
We do not quote a figure without seeing the doors, and we won't throw out a generic number here. What we can do is tell you honestly what moves the cost up or down.
The count of cylinders is the biggest factor. Ten doors and sixty doors are different projects. Next is whether your existing hardware can be master keyed, or whether some locks must be replaced. Older or mismatched cylinders often cannot be pinned for a second shear line and are better swapped.
The number of levels comes next. A two-level system is simpler than a grand master arrangement with many groups. Then the keyway: a standard keyway is the lighter-cost option, while a restricted, duplicate-protected keyway usually adds expense because of the controlled blanks and the authorization process. Finally, the number of keys cut, and any new door hardware that turns up during the walk-through.
If you have a handful of doors and need strong key control without a full hierarchy, a plain lock rekey onto one key is usually the more economical route. We would rather tell you that than sell you a system you do not need.
Master key systems for Lakewood apartments, storefronts, and rental homes
Lakewood is a postwar planned suburb, with roughly 17,500 compact single-story tract homes built between 1950 and 1953. Apartments are limited and sit mostly along major corridors such as South Street and Candlewood Street. That shapes where master key work actually shows up here.
For apartment buildings near Candlewood Street, the need is straightforward: a manager and maintenance staff need access to every unit, while each tenant should only open their own door. A master key system does that cleanly, and it makes turnover easier, because a unit can be rekeyed to a new tenant key without redoing the whole building. It also helps when a tenant is locked out; our apartment lockout service is a different job, but a clear key hierarchy means the manager can often solve the problem without calling anyone.
For storefronts on Lakewood Boulevard, South Street, and Del Amo Boulevard, and for businesses in the Lakewood Center district, the typical layout is front door, back door, stockroom, office, and sometimes a shared suite entry. A small hierarchy gives the owner everything, the shift lead the sales floor and stockroom, and part-time staff only the front. Door-level repair work is covered by our storefront lock repair page.
Rental homes are the quieter case. If you own several single-story ranches in areas such as Lakewood Park, Lakewood Mutuals, or Mayfair, and they sit in ZIP codes like 90712, 90713, or 90715, a master key arrangement lets you or your property manager open every property with one key while each tenant gets only their own. Many of these homes still carry decades-old knob and deadbolt hardware, and side-yard gates and garage side doors are near-universal, so the plan usually includes those extra openings. Our locksmith for landlords page covers the wider rental picture.
Our Westwood storefront is about 29 miles from Lakewood, so for system design we come to you with a mobile van and walk the property rather than guess from a phone description.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366When a master key system is the wrong choice
Master keying is not free of tradeoffs, and a good locksmith says so. Every master key adds a second valid way to open a lock, which means a master keyed cylinder is technically somewhat easier to attack than a single-key cylinder. For most buildings this is a fair trade, but it is a trade.
For that reason, we advise against deep hierarchies with many grand master levels unless you really have that many groups. We also advise against master keying a lock that guards something extremely sensitive, such as a safe room or a records closet. Those openings are better left on their own key, kept off the master.
If your site has only a few doors, a single rekey does the job. If your problem is tracking entry rather than controlling copies, electronic access is better. And if your issue is a lock that sticks or a door that will not latch, that is a repair question, not a key-system one.
Why call Wilshire Lock & Key for a master key system
We have been in business since 1987, and master key work rewards that experience. These systems last for years, and the mistakes are made at the design stage, long before anyone notices them.
We are a single company with a storefront at 10740 Wilshire Blvd in Westwood and our own mobile vans. There are no dispatch middlemen between you and the person doing the work. David, our owner and lead technician, oversees the work, and he is the one to ask about the hierarchy design if you want a second opinion on a plan someone else drew up.
One more thing worth knowing: California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), called an LCO license. Ask any locksmith for it before they touch a building you are responsible for, including us. A master key system puts access to many doors into the hands of the company that builds it, so that question is fair.
Our phone is answered 24 hours a day, 7 days a week, at (213) 577-1366. If you have a lockout or an emergency, we handle that too, but a key system is best planned in daylight with the doors in front of us.
Frequently asked questions
Can my existing locks be turned into a master key system?
Often yes, but not always. Many pin tumbler cylinders can be repinned to accept a master key. Older, worn, or mismatched cylinders sometimes cannot, and we will replace those rather than force the issue. We check every cylinder during the site walk-through.
What is the difference between a master key and a grand master key?
A master key opens all the locks in one group, such as every unit on a floor. A grand master opens several of those groups together, such as every floor or every building. Most small properties only need one master level.
Can someone copy a restricted key at a hardware store?
Not normally. Restricted keyways use blanks that are not sold over the counter, and copies are usually cut through an authorized dealer after your authorization is checked. Ordinary keys can be copied almost anywhere, which is why we recommend restricted keyways when copying is the main concern.
What happens if an employee loses a master key?
A lost master key is serious, because it opens many locks. Depending on the system, we may rekey the affected cylinders or replace them. A written key log helps us see exactly which locks are affected, which keeps the work targeted instead of building-wide.
Do I need a master key system for a single Lakewood tract home?
Almost never. One house with a front door, back door, and garage side door is better served by a simple rekey so all locks work on one key. A master system makes sense when different people need different levels of access across many doors.
Can you add new locks to a master key system later?
Yes, if the system was documented properly. We keep the key chart for the plan, so new cylinders can be pinned to fit the existing hierarchy. If a restricted keyway is in use, new keys are cut through the controlled process. Ask us about the records before the first install.
Is a master key system the same as electronic access control?
No. A master key system is mechanical and controls who can open which door, but it does not record entries. Electronic access control can log who entered and when, and credentials can be turned off instantly. Many buildings use both for different doors.
How do I know which locksmith to trust with a master key system?
Ask for their BSIS LCO license number, which California requires of locksmith companies. Ask who actually does the work and who keeps the key records. A reliable company will answer all of this directly, and will tell you if a simpler solution would serve you better.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.

