Keyed-Alike vs. Master Key Systems: Choosing the Right Hierarchy
Keyed-alike grouping is the simpler of the two approaches. Multiple locks are rekeyed or installed so that a single key opens every lock within that group — useful for a small office where every employee needs the same access, or for a landlord who wants all ground-floor common-area doors on one key. It reduces the number of keys each person carries without creating a tiered permission structure. The limitation is obvious: everyone in the group has identical access, so it doesn't work where you need a manager to open a supply room that staff cannot enter.
A true master key system layers multiple keyed-alike groups beneath a grand master or great-grand master key. A department head might carry a sub-master that opens every door in their wing; a general manager carries a master that spans multiple sub-master groups; a property owner or facilities director holds the grand master that opens everything. Each level is engineered into the pin stacks of the locks themselves — no electronics required, though we can also integrate electronic access control on top of the mechanical layer when your property demands it. Designing this correctly from the first pin cut is critical; a poorly planned hierarchy creates cross-keying conflicts that are expensive and disruptive to untangle later.
