What is a master key system, and who in Valley Glen needs one?
A master key system lets different keys open different groups of locks, with higher-level keys opening more than one group. A tenant's key opens that tenant's door and nothing else. A manager's key opens every unit door. An owner's key opens all of those plus the laundry room, the storage areas, and the office. Instead of a heavy ring of near-identical keys that someone has to sort through at the door, each person carries the one key that matches their job.
In Valley Glen, the people who ask about this usually fall into a few groups: owners of apartment buildings along Victory Boulevard, landlords who run several rentals, small businesses with staff who need different levels of access, and property managers who are tired of tracking a drawer full of unlabeled keys. The rule of thumb is simple. If you have more than a handful of doors and more than a couple of people who need to get through them, a master key system is worth a conversation.
This page is about designing and installing the system itself: the hierarchy, the cylinders, the restricted keyways, and the key control that keeps it all working. If all you need is one lock changed, lock rekeying is the simpler job, and we will tell you honestly when that is all you need.
How does a master key hierarchy work?
Most systems are built on pin tumbler cylinders, the same kind of lock found on almost every door. In a standard lock, one set of pins lines up with one cut pattern. In a master keyed lock, extra pieces are added to some of the pin chambers so that a second cut pattern also lines up the shear line. The lock now responds to two keys: the one assigned to that door and the one assigned above it. Add more pieces and you can add more levels.
A typical hierarchy has these layers, and you only use the ones you need:
- Change key (also called a user key): opens one lock or one small group of locks, such as a single apartment or a single office.
- Sub-master: opens a defined group, such as every unit on one floor, one building in a complex, or all the shop-floor doors.
- Master: opens everything in a larger group, such as every unit door in the building.
- Grand master: opens everything in the system, including areas the lower masters do not reach.
- Keyed-alike groups: several locks that all take the same key, handy for a back gate, a trash enclosure, and a service door that one person always uses together.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Restricted keyways and duplicate-protected keys: what they do and what they do not do
A keyway is the shape of the slot a key slides into. On ordinary locks, the keyway is common, which means anyone can walk into a hardware store and have a copy cut on a standard blank. A restricted keyway uses a profile that blanks are not freely sold for. Duplicate-protected keys go one step further: copies are only made through an authorized source, and usually only when the person asking can show they are on the list for that system.
This is what people mean when they search for a restricted key system or a key control system. It is a real improvement over open keyways, because it stops casual copying by employees, former tenants, and contractors. It is not magic. Protection levels vary by keyway and by manufacturer, the rules around who may order copies are set by the system owner, and a determined person with the right tools is a different problem than a person with a spare key. For doors that need more than control over who copies keys, our high-security lock work covers pick- and drill-resistant hardware.
The trade-off is convenience. Restricted blanks mean you cannot get a copy cut at the corner kiosk, and that is the point. Anyone who needs another key goes through you, or through us if you authorize us. If you want to understand how standard copying compares, our key duplication page explains the ordinary process.
How do we design and install a master key system?
Nothing about a good system is improvised at the door. The planning takes longer than the installation, and skipping it is how people end up with a system that locks them out of their own building. This is the order we work in.
- Walk the property and list every lock. We note the door, the type of lock, the brand, the condition, and who currently uses it. Older hardware sometimes cannot be master keyed and has to be swapped.
- Talk through who needs access to what. We build a simple chart: people or roles down one side, doors across the top. This is the part where owners often realize the current key situation has no logic to it.
- Choose the hierarchy. We decide how many levels you actually need. Fewer levels is generally better for security, so we will not add layers just because the system allows it.
- Pick the keyway and protection level. That means standard, restricted, or duplicate-protected, based on how much key copying worries you.
- Build and bit the cylinders. Cylinders are pinned to the chart, and each key is cut and checked against the doors it should and should not open.
- Install and test every door. We try each key in each lock. A system is only finished when every key opens exactly what it is supposed to and nothing else.
- Hand over the records. You get the key chart and the instructions for ordering additional keys, and we keep the system information so future work matches it.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What affects the cost of a master key system?
We do not quote numbers on a web page because the job depends on specifics, and any company that quotes you a flat figure without seeing the doors is guessing. Here is what actually moves the cost up or down:
- How many doors and cylinders are involved. Each lock needs to be pinned and tested.
- Whether existing locks can be converted. Rekeying existing cylinders is usually the more economical route. If the hardware is worn, mismatched, or cannot take the extra pins, those cylinders get replaced.
- How many levels the hierarchy has. More levels means more planning and more cut keys.
- The keyway you choose. Restricted and duplicate-protected systems cost more to set up than open keyways because the blanks and the authorization process are more controlled.
- How many keys are cut at the start. A building with a large number of users needs more keys than a small office.
- Door condition. A door that binds, a latch that does not line up, or a closer that slams will make even a perfect cylinder feel broken. Fixing those is separate work, and we will say so up front.
- Whether you want electronic access added for some doors. Combining mechanical keys with access control installation changes the scope.
- Timing. Planned work during business hours is different from an emergency call-out after hours.
Master key systems in Valley Glen: apartments, rentals, and gates
Valley Glen's housing is mostly postwar single-family tracts from the 1940s and 50s, with apartment buildings concentrated along Victory and Vanowen. Because the neighborhood was carved out of Van Nuys and North Hollywood in the late 1990s, the hardware profile matches those older areas. That matters for a master key project, because older buildings tend to have a patchwork: a few original locks, several replacements from different years, and cylinders from more than one brand. Our survey step is where we find out which of those can be converted and which need to be swapped.
Apartment building lock service along Victory Boulevard is the most natural fit. An owner or manager in the Victory Boulevard corridor commonly has unit doors, a laundry or storage room, a mailroom, and a gate, each of which currently has its own key and its own history of lost copies. A master hierarchy ties those together: one manager key, tenant keys that open only their own door, and a restricted keyway so a former tenant cannot just copy the unit key down the street. If you manage rentals across 91401, 91405, or 91606, our locksmith for landlords page covers the wider picture of turnover and rekeying between tenants.
Student rentals near the Los Angeles Valley College district are another common case. Tenants change often, keys get passed around, and lockouts are routine. A landlord with several houses or units can keep a master for their own access while each rental has its own change key. When a tenant leaves, you rekey that one cylinder instead of redoing the whole property. For the lockouts themselves, see our apartment lockout service, because a master system does not stop someone locking themselves out.
Properties that back onto the Tujunga Wash Greenway often have rear gates and padlocks that see more weather and more traffic. Padlocks and gate locks can be included in the hierarchy, so one key opens the gate, the shed, and the side door. If a gate lock needs work first, gate lock repair is the place to start.
Businesses along the Burbank Boulevard and Oxnard Street corridors have a different need: staff who open and close, a manager, an owner, and sometimes a cleaning crew. A short hierarchy with restricted keys is usually enough.
One local note on climate. Valley Glen sits on the central valley floor, with hot, dry summers, and heat causes doors and weatherstripping to expand. A door that sticks in July can make a good key feel like it is failing. Before blaming a new system, we check how the door closes and how the latch seats. If the door is the problem, we tell you.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How do you keep employee keys under control?
Installing the system is half the job. An employee key control system is mostly a matter of habits, and a restricted keyway only helps if the rules around it are followed. These are the practices that actually hold up:
- Keep a written log of every key issued: the key number, who holds it, and the date. A key with no record is a key you cannot account for.
- Stamp keys with a code, not the address. If a key is lost, it should not tell the finder where to use it.
- Limit how many master keys exist. The more top-level keys in circulation, the more damage one loss can do.
- Require keys back when someone leaves, and check them against the log.
- Decide in advance who may authorize additional keys, and tell us so that we only cut keys for those people.
- Rekey the affected cylinders if a high-level key goes missing. This is why the hierarchy should be designed so that replacing a small group of cylinders is possible without redoing everything.
Why call Wilshire Lock & Key for a master key system?
We have been in business since 1987, and master keying is one of those jobs where experience shows. Plenty of problems are not visible until a system is in use: a hierarchy that was too ambitious, a cylinder that did not tolerate the extra pins, a chart that nobody updated. We have seen how these things go wrong, and we plan to avoid them.
You are dealing with one company. We have a storefront at 10740 Wilshire Blvd in Westwood, plus mobile service vans that come to you, and there is no dispatch middleman between you and the person doing the work. David, the owner and lead technician, oversees the work. Valley Glen is about 13 miles from our base, and our commercial locksmith work covers the rest of what a business property typically needs.
One more thing to know. California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), a Locksmith Company (LCO) license. Ask any locksmith you are considering for their license number, including us. It is a fair question and you should expect a straight answer.
If you are not sure whether you need a full master key system or a simpler fix, call (213) 577-1366. The line is answered 24 hours a day, every day, and we will tell you which one fits.
Frequently asked questions
Can you master key the locks I already have?
Often yes, but it depends on the cylinders. Many standard pin tumbler locks can be converted by adding pieces to the pin chambers. Some are too worn, too cheap, or too tight to take the changes, and those need replacement cylinders. We confirm this in person during the survey, not over the phone.
Is a master key system less secure than separate keys?
It adds some risk, and anyone who says otherwise is overselling. A master keyed lock responds to more than one key, and a lost master key affects every door it opens. We reduce that by keeping the hierarchy as short as possible, limiting the number of top-level keys, and using restricted keyways where it makes sense.
What is the difference between a restricted keyway and duplicate-protected keys?
A restricted keyway means the key blanks are not freely sold, so a copy cannot be cut on a common blank. Duplicate-protected keys add an authorization requirement, so copies are only made for people on the approved list. The two often go together, and the level of protection varies by keyway.
Can I still get copies made at a hardware store?
Not for a properly restricted system, and that is the point. Copies go through the authorized source, which can be us if you set it up that way. If you want ordinary copying on some doors, we can leave those on a standard keyway.
What happens if someone loses a master key?
It depends on the level. Losing a change key for one unit means rekeying that one cylinder. Losing a master or grand master is more serious, because it opens many doors, and the affected cylinders usually need to be rekeyed. A well-planned hierarchy makes that a contained job instead of a full rebuild.
Does an apartment master key system work for a small building?
Yes. An apartment master key system is common even for modest buildings, where an owner or manager wants one key for all units and common areas and tenants want only their own. We will tell you if the building is small enough that simple rekeying and a good key log would do the job.
Can we add doors to the system later?
Usually, if it was planned for. The system chart should leave room for growth, and we keep the system information so new cylinders match. Systems that were built with no room can sometimes be extended, but occasionally the better answer is a new hierarchy.
How long does installation take?
It depends on the number of doors and how many cylinders need replacing. Survey and planning come first, and then installation is done door by door with testing. We will give you a realistic schedule after we have seen the property, not before.
What should I have ready when I call?
A rough count of the doors, who needs access to what, how many people currently carry keys, and any problems you have had with lost or copied keys. Photos of the current locks help. Call (213) 577-1366 and we will go from there.
More locksmith help in Valley Glen
Master Key System near Valley Glen
Related articles
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.

