Is A Master Key System Worth It?
A master key system is worth it once you are managing access for more than a handful of people who each need different doors — a small landlord with 3 or more units, an office with staff and a manager, a storage facility. Below that scale, keyed alike or standard individual keys are usually simpler and cheaper.
The question is not whether master keying works, it always does. The question is whether your situation actually needs the access control it provides.
When it genuinely pays for itself
- Multiple rental units — you need one key that opens everything for maintenance, while each tenant keeps their own key to only their unit.
- Small offices with a manager and staff — staff access their own areas, one key opens everything for the manager.
- Storage or self-storage facilities — individual unit keys plus one master for facility management.
When it is probably overkill
- A single-family home, even with several doors — keyed alike solves this more simply
- Two units where you already know and trust both tenants directly
- Any setup where everyone should have equal access anyway
Master keying vs keyed alike
| Master key system | Keyed alike | |
|---|---|---|
| Individual access control | Yes, each key opens only its own lock(s) | No, one key opens everything |
| One key for the owner/manager | Yes, the master | Not applicable, only one key exists |
| Best for | Multiple users needing different access | A single household or user |
More on keyed alike specifically in keyed alike explained.
How a master key system is set up
Each lock is pinned with two shear lines — one that responds to its own individual key, and one that responds to the master. This means the individual keys cannot open each other’s doors, but the master opens all of them. It requires all locks be compatible cylinders, usually set up in one visit.
Setting up a master key system
Tell us how many doors, how many individual key holders, and who needs the master. Ranges are on the prices page, full detail on master key systems.