Master key systems

Cylinders are keyed in layers. A change key opens one door, a master key opens a group of doors, and a grand-master key opens a larger set.

Lock Specialists works on master key systems for offices, multi-unit residences, and commercial properties. Each layout is planned before any cylinder changes.

• Keys for former tenants or staff remain in circulation.
• Nobody can say how many master keys exist.
• A new tenant needs access that the current layout does not allow.
• Keys open doors that the current key plan does not cover.

• Mixed key series left over from past installs.
• Cylinders keyed to a plan that nobody documented.
• A master key that opens more doors than one holder’s role requires.
• Interchangeable cores that were left out of the key schedule.

The technician records the existing keying, cylinder types, and every key series on the property.

The technician plans the key hierarchy on paper and confirms cylinder compatibility before touching any lock.

The technician rekeys or replaces cylinders, sets the new master and change keys, and updates the key schedule.

The technician tests each key against its assigned door and confirms each master key opens only the doors on its list.

Design fixes the change, master, and grand-master levels before any cylinder is touched. A clear plan leaves room for future tenants, but added levels raise the number of keys to track and can increase cylinder costs.

A grand-master key opens several master-keyed groups, which suits buildings with separate wings or zones. Each added level makes the key schedule longer and harder to audit.

Rekeying changes the pins so that old keys stop working, then new keys match the updated plan. It suits buildings where key control has slipped.

Interchangeable cores are removable cylinder cores that swap without replacing the lock body. Servicing covers cleaning, pin changes, and core swaps when the key plan changes.

Standard pin cylinders: the most common cylinders in offices and apartments.

Interchangeable cores: removable cores in cylinders that accept them.

Change, master, and grand-master keys: each key series and its assigned doors.

Key schedules: the written record of which key opens which door.

Staff carry a single key for shared doors.

Each person holds only the keys their role requires.

A lost change key affects one door rather than the whole building.

A key schedule shows who holds which access.

• The cylinders are sound and the problem is key control.
• The original plan still fits the building.
• Only a few cylinders need new pins.

• Cylinders are worn, cracked, or damaged beyond rekeying.
• The lock body does not support the new key plan.
• Repeated rekeys cost more than one planned replacement.

More doors and more key levels mean more cylinders, keys, and planning time. Reusing existing cores lowers the cost, but a complex layout may still need new hardware. Lock Specialists gives an upfront quote before any cylinder changes.

A small office with a few cylinders takes far less time than a multi-building property. Planning can take a meaningful share of the total, so the key schedule comes first.

Gather your existing keys and a list of tenants or staff before the visit, because the plan depends on them.

Service areas: Simi Valley, Moorpark, Thousand Oaks, Chatsworth, and Porter Ranch.