How a master key system is organized
- Change keys open one lock or one group of locks, such as an apartment or a single office.
- Master keys open a set of change-key locks, such as all mechanical rooms in a building.
- Grand master keys open several master groups, such as every common door across a portfolio.
- Keep the levels as few as the operation actually needs. Every extra level adds cost and makes the system harder to keep secure.



Product images: manufacturer marketing materials.
Key control is the real point
- Restricted keyways: keys that can't be cut at a hardware store, ordered only through the authorized dealer with the owner's authorization. We set these up on Mul-T-Lock.
- Key records: a schedule of which key opens which door and who holds it. We keep it with your account.
- Signed authorization: decide who at the management company can order keys and approve changes.
When staff change
When a super or porter leaves, decide which keys they held. If the keys are restricted and all returned, the record is updated. If a master key is missing, the affected locks are rekeyed or recored within the existing system, so other keys keep working.
Several buildings, one system
Management companies often want a portfolio master for the office while each building's staff keys stay separate. We design that once and extend it as buildings are added. See master key systems and management accounts.

