The idea in one paragraph
In a master key system, every lock accepts two or more different keys: an individual key that opens only that door, and a master key that opens a defined group of doors. A manager carries one key instead of fourteen, while a casual employee carries a key that opens only the storeroom they need.
When it is worth doing
Below roughly six doors, keyed-alike sets and careful key issuing usually cover it. Above that, or wherever different people need different access, a master system pays for itself the first time someone leaves.
- You have multiple staff tiers with genuinely different access needs.
- You are tired of a keyring that has to be labelled to be usable.
- You expect to add doors or tenancies later and want a system that extends.
- You need to demonstrate access control for insurance or compliance.
Restricted keys and why they matter
A restricted key uses a patented profile that blank suppliers will not sell openly, so it cannot be copied at a hardware counter or kiosk. Duplicates are issued only against a signed authority held on a key register.
Without restriction, a master system is only as strong as the honesty of everyone who has ever held a key.
Keeping the system healthy
A master system is a living document, not a one-off install. The businesses that stay in control are the ones that treat key issuing like issuing a laptop.
- Record every key number, who holds it, and the date issued.
- Collect keys as part of your offboarding checklist, before the final pay run.
- Audit the register at least annually against physical keys.
- When a key goes missing, rekey the affected cylinders rather than hoping.
Need a hand with this?
If you would rather have someone look at it, we cover Melbourne's north and inner suburbs. Send us a photo and a description and we will tell you what the job involves before you commit to anything.