Master Key Lock System (Design, Rekey & Maintenance)
Control access with a professionally designed master key system. GOAT Locksmith and Doors plans and implements keyed hierarchies—Grand Master, Master, and Change Keys—so tenants and staff get only the access they need while managers carry one key. We handle design, key records, restricted keyways, and ongoing expansion.
What’s in a Master Key System?
A master key system creates a clear key hierarchy. One top-level key opens every door; mid-level master keys open a group (e.g., floors or departments); individual change keys open a single door or suite. We use restricted or patented keyways (where desired) to prevent unauthorized duplication.
| Level | Opens | Use Case |
|---|---|---|
| GMK (Grand Master) | Entire facility / portfolio | Owners, property managers |
| MK (Master) | One group (building, floor, department) | Superintendents, area leads |
| CK (Change Key) | One lock / unit / office | Tenants, staff |
Our Process (Design → Rekey → Documentation)
1) Survey & Plan
We document doors, cylinders, and current keys. Then we design a scalable master chart for your site.
2) Restricted Key Options
Choose controlled key systems to stop unauthorized copies and track issuance.
3) Rekey & Deployment
We re-pin cylinders to the new plan, issue keys by level, and label/record everything.
4) Ongoing Maintenance
Add doors or change access later—your master chart lets us expand cleanly without conflicts.
Benefits of a Professional Master Key System
- Access control: precise permissions for tenants, staff, and contractors
- Less key clutter: one master for management
- Restricted key duplication: protect against unauthorized copies
- Scalable: add floors, suites, or sites without redoing everything
- Clear records: key issuance logs and master charts kept on file
Where We Install Master Key Systems
Apartment buildings, office towers, medical and dental clinics, schools, industrial units, and retail plazas across Toronto & the GTA.
Related Services
Lock Installation and Repair • High Security Lock Installation • Emergency Locksmith • Door Installation and Repair • Break-In Repair Services
Areas We Serve
Toronto North York Vaughan Concord Richmond Hill Markham Scarborough Etobicoke Mississauga Brampton Pickering Ajax Whitby Oshawa Woodbridge Maple Thornhill Oakville Burlington Milton Newmarket Whitchurch-Stouffville GTA
Master Key Systems — FAQs
What’s the difference between GMK, MK, and Change Keys?
GMK opens your entire site or portfolio; MK opens one group (building/floor/department); a Change Key opens one lock or suite.
Can we stop unauthorized key copies?
Yes—use a restricted or patented keyway. We keep issuance logs and require authorization for duplicates.
Can you expand our existing master system?
Usually yes. We’ll survey cylinders and charts, then add groups or units without creating pinning conflicts.
Do we need to replace all locks?
Not always. Often we re-pin existing cylinders to the new hierarchy and replace only where hardware is incompatible or worn.
