Master Key Systems

A master key system is an engineered arrangement of pin-tumbler or disc-cylinder locks in which individual keys open only their assigned doors, while a master key — or a series of master keys at different privilege levels — opens a defined subset of those doors. The architecture typically has at least three tiers: the change key, which opens one lock; the master key, which opens a defined group; and the grand master or great-grand master, which opens everything in the system. Larger campuses can add a fourth level — a great-grand master key held only by a building owner or property manager. Every cylinder in the system is machined to accept its change key and every key above it in the hierarchy, but nothing below. This is accomplished by adding extra sets of driver pins — called master wafers — inside each cylinder, which is why a master key system requires professional design rather than ad-hoc cutting.

The number of levels you need depends on your organizational structure. A single-tenant office suite in a New Brunswick commercial building might need only two tiers: individual office keys and one master for the office manager. A multi-floor research facility near College Avenue might need four, with separate master domains for administrative areas, laboratory corridors, server rooms, and an executive suite. Getting this architecture wrong at the design stage is expensive to correct — cylinders must be re-pinned or replaced. Our experienced technicians map your space, identify every controlled opening, and produce a written keying schedule before a single cylinder is touched. That schedule becomes the permanent record for future additions to the system.

The lock body itself matters as much as the keying architecture. For commercial properties in New Brunswick — particularly older downtown buildings on French Street or the converted warehouse spaces near the train station — the standard of choice is the mortise lock, a full-featured lock body that sits inside a pocket routed into the door edge rather than surface-mounted. A quality mortise lock integrates the latch, deadbolt, and cylinder into a single robust unit that is far more resistant to spreading, shimming, and forced entry than a cylindrical door knob lock. When we design a keying hierarchy, we evaluate whether your existing door frames can accept mortise hardware, whether the current door knob lock or rim cylinder can be re-pinned to fit the new hierarchy, or whether a hardware upgrade is the smarter long-term investment.

Brands such as Schlage and other commercial-grade manufacturers offer interchangeable-core mortise cylinders that allow the keying hierarchy to be changed by a trained technician in seconds without dismantling the entire lock body — an important feature for properties that rotate staff frequently, like the university-adjacent apartment buildings on Hamilton Street. We stock a range of cylinder grades and can source specialty hardware for fire-rated doors, ADA-compliant lever trim, and doors requiring specific ANSI grade ratings. Every installation is performed damage-free where the door and frame allow it, and we document the hardware spec for each opening so your records stay current.

Designing a keying hierarchy is only half the job for a commercial locksmith engagement — the other half is ongoing management. We provide every client with a written keying schedule: a document that lists each opening, its assigned change key number, and its position in the master hierarchy. When an employee leaves or a tenant vacates, you call us, we rekey that cylinder to a new change key code, and the old key goes dead without disturbing the rest of the system. This is far more cost-effective than replacing hardware, and it is the correct response to a lost key replacement scenario in a controlled-access environment. For emergency locksmith situations — a property manager locked out of a mechanical room at midnight, a retail tenant unable to open for morning deliveries — our mobile team is dispatched around the clock, every day of the year, including holidays.

We also handle situations where a building has no existing system at all, or where a previous owner's system has become undocumented and chaotic. In those cases we perform a full audit: every lock is inspected, current keying is mapped, and we present options ranging from a targeted rekey to a complete hardware replacement with a new keying schedule. New Brunswick properties that have cycled through multiple tenants or ownership groups — common in the densely rented blocks around Livingston Avenue — often have dozens of outstanding keys with no record of who holds them. A fresh system, properly documented, closes that security gap and gives the current owner real control over their building. Call (000) 000-0000 to schedule a site assessment; we answer 24/7 and can often dispatch the same day.

Master key design is our most technically involved commercial service, but it sits within a much broader capability set. New Brunswick Locksmiths handles the complete range of residential, commercial, and automotive work that property owners and drivers in the area encounter. Our 24/7 lockout service covers home, office, and vehicle lockouts — if you are locked out of your car on Route 1 or locked out of your apartment near George Street, a mobile technician comes to you, verifies ownership, and opens the vehicle or door using professional, damage-free methods. We do not recommend attempting self-entry; improper tools or techniques damage door frames, weatherstripping, and lock hardware in ways that cost far more to repair than a professional service call. For automotive work, we provide car key programming for vehicles that use transponder chips, proximity fobs, push-button ignition systems, and high-security laser-cut keys — lost key replacement for modern vehicles requires both the physical key blank and the correct programming sequence, which varies by make, model, and year, and must be performed by a qualified technician with the right equipment.

Our lock rekey and replacement services cover door knob lock sets, deadbolts, mortise lock bodies, padlocks, cabinet locks, mailbox locks, and sliding door hardware. We install and service electronic access control keypads, smart locks with app integration, and pushbutton combination locks for offices that need keyless entry. Additional services include safe opening and combination changes, window lock repair, garage door lock replacement, peephole installation, door reinforcement with strike plate upgrades, interchangeable-core cylinder management, and master key system expansions for buildings that are adding new wings or floors. Every service call — whether it is a routine rekey or a 3 a.m. emergency locksmith response — includes a firm price confirmation before any work starts. Factors that shape the final quote include the type of lock or vehicle involved, the time of day, travel distance to your location, and any parts or hardware required. We never begin work until you have agreed to that number. To reach our team any time, day or night, call (000) 000-0000.

We offer the following specific services: master key system design and installation, keying schedule documentation, mortise lock installation and repair, door knob lock rekey and replacement, deadbolt installation and rekey, interchangeable-core cylinder management, high-security cylinder upgrades, commercial locksmith site assessments, 24/7 lockout service for homes and offices, emergency locksmith response for businesses, car key programming for transponder and proximity keys, push-button ignition key fob programming, lost key replacement for vehicles and properties, laser-cut and high-security automotive key cutting, lock rekey after tenant turnover, lock rekey after lost key replacement, electronic keypad and smart lock installation, keyless entry system setup, safe opening and combination changes, padlock replacement and keying, cabinet and filing cabinet lock service, mailbox lock replacement, sliding door and patio door lock repair, window lock installation, door reinforcement and strike plate upgrade, garage door lock replacement, peephole installation, panic bar and exit device service, ADA-compliant lever hardware installation, and master key system expansion for growing properties.