Master Key System in Centre Island, NY

The $195 to $850+ range comes down to two things: how many doors get keyed into the system and how many access tiers you need. A simple setup, one master key plus a few change keys for a house and garage, sits at the low end.

A full estate hierarchy with a top-level master, sub-masters for staff or property managers, and individual change keys for a main house, guest house, boathouse, and outbuildings costs more because each tier has to be engineered so the wrong key can never open the wrong door. When your technician calls back to quote the job, describe every structure and every group of people who need access so the price you're quoted is the price you pay.

Centre Island connects to the mainland by one road, so dispatch routes your nearest available technician in from Oyster Bay rather than guessing at a shortcut that doesn't exist. Call (516) 636-1712 and a dispatcher takes down the job and your number; the technician assigned to your area calls back within a few minutes to talk through your property's layout and quote the work, then arrival typically runs 15 to 30 minutes from there.

If your property has a gate or a long private drive, mention it on that callback so the technician can plan for it.

Walk the property first and count doors: main house exterior doors, garage, guest house, boathouse, any outbuilding you want on the system. Decide who needs to open what, since that shapes how many key tiers get cut.

Have your existing keys and any prior locksmith paperwork on hand if you're upgrading an old system rather than starting fresh, and make sure someone will be on site to let the technician into each building being rekeyed.