
Master Key System Setup: How Keyed-Alike and Hierarchical Systems Work
A master key system is built on a pinning hierarchy inside each lock cylinder. At the base level, individual change keys open only their own lock — a desk key that works at one office, nothing more. Above that sits the master key, which operates every lock in the system. In larger commercial properties, a grand master or great grand master level can be added, giving ownership or building management access across multiple zones or even multiple buildings under one umbrella. For Tenafly businesses with staff turnover — restaurants near the Village Center, medical offices, retail shops — this means rekeying a single cylinder when an employee leaves rather than replacing every lock or redistributing every key on the ring.
Keyed-alike systems serve a different need: every lock in a set responds to the same single key, without any hierarchical layering. This works well for storage units, supply closets, or small offices where uniform access across a handful of doors is all that's needed. Our team evaluates which approach — hierarchical master, keyed-alike, or a hybrid — fits your actual workflow before a single pin is touched. We then document the system precisely so future expansions, door additions, or key replacements integrate seamlessly with your existing configuration.

