Master Key System in Greenvale, NY

A master key system is priced by door count and how many tiers you need in the hierarchy, not a flat rate. A small multi-unit building with a simple two-tier setup (individual keys plus one master) costs less than a property needing a full hierarchy: unit keys, floor sub-masters, and a grand master for building staff.

Call with your unit count ready and the callback quote will be close to the final number.

• Rekeying existing cylinders to fit the new system, or supplying new hardware where locks are worn or mismatched, adds to the total.
• Expect $195 to $850+ once the technician sees the door count and current lock condition.

Master key work is not a same-hour emergency call, it is scheduled once the technician has assessed the property, so the dispatcher will set a visit time that works for you and building access. Greenvale properties near LIU Post and around the Northern Boulevard and Glen Cove Road junction sometimes have shared entrances or campus-adjacent parking rules, so let the dispatcher know if the technician will need a gate code, super's contact, or a specific loading or service entrance.

That detail gets passed along so the visit starts on time instead of the technician circling the block looking for access.

Before the technician arrives, walk the property and count doors that need to be on the system, note which ones already share a key type, and flag any cylinders that are damaged or already rekeyed. If you are a property manager, decide the tiers you want in advance: who needs unit-only access, who needs floor access, who needs full building access.

Having that list ready means the technician can quote and complete the hierarchy in one visit instead of a second trip to figure out the access plan.