
How Master Key Systems Work in Multi-Door Commercial Spaces
A keying hierarchy is built around a simple principle: keys higher in the hierarchy open everything below them, while keys lower in the hierarchy open only the subset of doors they are assigned to. At the base level, a change key (also called an individual key) opens one specific lock and nothing else — ideal for a staff member who should only access their own office or storage room. A sub-master key sits above that and opens a defined group of locks, such as all doors within a single department or floor. The master key opens every lock in the entire system, and in larger facilities a grand master key can sit above multiple master key systems that each govern separate buildings or wings. This layered control is exactly what a growing Englewood business needs when different teams, shifts, or tenants share the same physical space.
The engineering that makes this possible lives inside the lock cylinder itself. Each cylinder is pinned with a precise combination of driver pins, key pins, and — in master keyed cylinders — additional wafer or pin stacks called master wafers. Our technicians calculate every pinning combination mathematically before ordering or cutting any keys, ensuring there are no unintended cross-opens between levels. This is detail work that demands experience with the specific hardware being used, which is why an off-the-shelf rekeying kit from a hardware store cannot replicate what a trained commercial locksmith delivers.


