Master Key Systems

Streamline Access. Strengthen Control. Simplify Management.

At SherlockLock, we offer expertly designed and precisely installed master key systems for residential properties, multi-unit buildings, and small commercial spaces. Whether you're a landlord managing multiple tenants or a homeowner looking for organized access across multiple doors, a master key system brings unmatched convenience, elevated security, and centralized control over your property.

What Is a Master Key System?

A master key system is a structured lock setup where one key - the master key - opens multiple locks, while other keys (called change keys) open only designated individual doors. Each lock is reconfigured to respond to both a unique key and a higher-level master key, providing flexible, tiered access without compromising individual security.

Who Needs a Master Key System?

Master key systems are ideal for:

• Landlords managing apartment buildings, duplexes, or multi-family homes
• Property managers overseeing short-term or long-term rentals
• Homeowners with multiple entries, gates, garages, and interior locks
• Families with in-laws, older children, or hired help needing limited access
• Shared housing units or co-living spaces with access control needs

Benefits of Installing a Master Key System

✔ Centralized Control

Keep one master key for your entire property. You no longer need to carry a bulky keyring or wonder which key fits where.

✔ Tiered Access

Allow tenants, guests, or maintenance staff to access only specific areas with restricted sub-keys, preserving both security and privacy.

✔ Streamlined Property Management

When a tenant moves out, you can simply rekey the affected locks without replacing hardware or affecting other residents.

✔ Emergency Readiness

In urgent situations - like water leaks, fire, or a wellness check - you can access every door quickly and safely using the master key.

✔ Reduced Key Duplication Risks

By maintaining a formal key structure, you discourage unauthorized copying and simplify key control protocols.

Real-Life Use Cases

1. Duplex Property Owners
Install a master key system so your tenants have access to their own units, while you retain access to both units for maintenance or inspections.

2. Multi-Family Homeowners
Simplify access to shared spaces (like basements, laundry, or storage rooms) while keeping individual units private.

3. High-End Residences
Create tiered access levels - for example, a cleaner can access the mudroom and utility closets, but not bedrooms or home offices.

System Options We Offer

★ Single-Level Master Key System

All locks are keyed individually, but one master key opens all of them. This is ideal for small residential buildings or homes with multiple secure zones.

★ Multi-Level Master Key System

Set up multiple access levels:

• Grand Master Key (GMK): Opens all locks on the property
• Master Key (MK): Opens a defined group of locks (e.g., one floor or wing)
• Change Key (CK): Opens only one specific door or unit

This system works well for:

• Larger apartment buildings
• Mixed-use residential/commercial spaces
• Property portfolios with various locations

Materials & Brands

We only use commercial-grade cylinders and pins compatible with high-quality lock brands such as Schlage, Medeco, Mul-T-Lock, and ASSA. We offer both:

• Standard mechanical master key systems
• High-security restricted key systems (which prevent unauthorized duplication)

All keys can be coded, tracked, and documented for long-term management ease.

Master Key System Maintenance

Over time, locks can wear and keys may need reauthorization or rekeying. We offer:

• Regular system audits
• Key tracking and record keeping
• Emergency lockout and override service
• Rekeying for turnover or staff changes

Why Choose SherlockLock?

• Decades of experience in precision master keying
• Transparent pricing and scalable packages
• Service vehicles stocked with a wide range of cylinders and pins
• Local Boston technicians with fast response times
• Discreet, secure key control policy to protect your access levels

Schedule a Master Key System Consultation

Secure your property smarter - not harder. Let SherlockLock design a custom master key system that suits your building layout, access needs, and long-term plans.

📍 Serving Greater Boston with professional locksmith services backed by trust, certification, and real results.