Commercial · Designed and documented
Master Key Systems King City
One key for the owner, individual keys for everyone else, and a written schedule so the system still makes sense in five years.
The core idea
A Master Key System Is A Pinning Scheme, Not A Product
You cannot buy one off a shelf. It is designed for your building.
Inside a normal cylinder, each pin stack has one split — one height at which the plug can turn. A master keyed cylinder has an extra split in some of the stacks, so two different cut combinations will both line up: the individual key for that door, and the master key above it.
A small business usually runs two levels. Every employee holds a key to their own area; the owner holds one key that opens everything. A larger site adds sub-masters between those: a floor key, a department key, a grand master over all of them.
Each level you add makes the system more useful and slightly less secure, because every additional split is another position where the plug can turn. A well-designed two- or three-level system is entirely sound. A system that has grown without a plan for fifteen years usually is not.
How it works
The Levels, In Plain Terms
Change key
The individual key for one door, or one small group of doors. Most people in the building hold one of these and nothing else.
Sub-master
Opens a defined group — a floor, a department, a wing, a set of outbuildings. Held by supervisors and area managers.
Master key
Opens everything within its branch. Usually the owner, the manager and whoever is genuinely responsible for the premises.
Grand master
On a multi-building site, one key above all the masters. Rare in small business and common on institutional and multi-property sites.
Maintenance key
A deliberately limited key for cleaners or contractors that opens the doors they need and nothing else. Often the most useful level to add.
Keyed-alike groups
Not a master level at all — simply several doors sharing one combination. Frequently the right answer where a full master system would be overkill.
The key schedule
The Document That Decides Whether It Survives
The pinning is the easy part. The reason master key systems fail is almost always administrative, and it comes down to one missing document.
A key schedule records which key opens which door, how many of each key exist, and who holds them. Kept current, it means a departing employee is a two-minute conversation and a found key is instantly identifiable. Not kept, it means nobody knows what anything opens, keys accumulate without limit, and the only route back to a known state is repinning the entire site.
We hand you the schedule when the system is installed, and we keep a copy so that a call two years later does not start from zero. Updating it takes about five minutes per staff change.
If you have inherited a system with no schedule — which is extremely common — we can survey the site, work out what actually opens what, and rebuild the documentation without repinning everything.
Questions we ask before designing one
✓ How many doors, and which group naturally?
✓ Who needs everything, and who needs one area?
✓ Are there doors nobody should reach, even with a master?
✓ Do cleaners and contractors need after-hours access?
✓ Do you want a restricted keyway so keys cannot be copied?
✓ Who will own and update the schedule?
A restricted keyway is the single upgrade most worth its cost on a commercial system.
Key control
A Master Key You Cannot Control Is A Liability
The whole value of a master key system concentrates in one object. Whoever holds the master can open every door it covers, and if it goes missing every cylinder it opened is compromised.
That is why a restricted keyway matters more on a master system than anywhere else. The blanks are not sold to the public, and copies are cut only by an authorised locksmith on your written authority. Without that, anyone holding the master for ten minutes can have a copy made at a kiosk and hand the original back.
The second protection is design. Keeping the number of master keys genuinely small, and using sub-masters rather than handing out the top-level key for convenience, limits what a single loss costs you.
And if a master does go missing, tell us straight away. Repinning the affected cylinders overnight is a normal job. Discovering it six months later after an unexplained loss is a different conversation.
Where they fit
Sites Around King Township That Use Them
01
Retail and offices
Front of house, staff areas, stock rooms and a cash office. The classic two-level system, and usually all a small business needs.
02
Farms and equestrian facilities
House, barns, tack rooms, feed stores, workshops and gates. Staff get the areas they work in; the owner carries one key for everything.
03
Multi-unit and condo buildings
Unit doors, lobby, stairwells, garbage, laundry and parking. The master risk is highest here and so is the value of a schedule.
04
Schools and community buildings
Heavy traffic, many key holders and strict egress rules. Documentation matters more here than anywhere.
Inherited A System Nobody Understands?
This is one of the most common commercial calls we take. A business changes hands, or a manager leaves, and what remains is a drawer of unlabelled keys and no idea what opens what.
It is fixable without repinning everything. We survey the site, test systematically, and rebuild the schedule from what is actually there. Usually only a handful of cylinders need attention — the ones where the original design has been quietly broken by a previous contractor adding a lock outside the scheme.
You end up knowing what you have, which is the position you need to be in before deciding whether to change anything.
Questions
Frequently Asked Questions
How much does a master key system cost?
It depends on the number of doors, the number of levels and whether you want a restricted keyway. Designing it properly at the start is far cheaper than repinning a site that grew without a plan.
Can you master key my existing locks?
Sometimes. It depends on the brand, the keyway and whether the cylinders have enough pin chambers. We survey first and tell you what can be reused.
What happens if the master key is lost?
The cylinders it opened are compromised and should be repinned. Tell us immediately — an overnight repin is a normal job.
Is a master system less secure than individual locks?
Marginally, because extra shear lines exist. Well designed with a restricted keyway, it is entirely sound, and the control it gives you outweighs the theoretical loss.
Can it include padlocks and gates?
Yes. Padlocks on the same keyway are common on farm and industrial sites, so the master opens gates and equipment stores too.
Do you keep a copy of our schedule?
Yes, so a call two years later does not start from zero. You hold the authoritative copy and we hold a reference.
Service area
We Come To You
We are a mobile service — there is no shop counter to drive to. King City is our base, and we cover King Township and northern York Region.
Not on the list? If you are anywhere in York Region, call and ask.
Locked Out? We Answer The Phone.
24/7 mobile locksmith service across King City, Nobleton, Schomberg and York Region. Real prices on the phone, a marked vehicle at your door, and a written invoice when we are done.