A master key system is an access design project. Begin with a schedule of who should open which doors, then select compatible cylinders and controls that support the plan.
Translate responsibilities into an access hierarchy
List buildings, floors, departments and individual openings. Separate everyday user access from management access and identify doors that should remain outside a shared system. Consider future tenants and additional openings before the hierarchy is finalized. A well-organized schedule is more useful than simply requesting one key that opens everything.
Treat key control as part of the system
A hierarchy does not by itself prevent unauthorized copying. Restricted or patented key systems can add a controlled duplication process, depending on the chosen product and authorization program. Keep a key-issuance register, identify approved ordering contacts and decide what action a missing key should trigger.
Protect the records and plan for change
Detailed keying schedules and sensitive codes should be shared through an agreed secure process. Ask who will own the records and how future changes will be authorized. Existing mixed cylinders may limit compatibility; retaining every lock is not guaranteed. The project should document boundaries, deliverables and responsible contacts before hardware is ordered.
Leave room for controlled expansion
An opening inventory should include existing cylinders, door functions, authorized groups and expected future changes. Discuss the key-system owner, duplication controls and the handover of sensitive records. A master-key hierarchy provides convenience but does not automatically create electronic audit trails or timed access. The proposed design should explain these limitations before cylinders and keys are ordered.
What to have ready
• Approximate number of buildings and doors • User groups and required access boundaries • Existing cylinder brands and anticipated expansion