When to Rekey or Upgrade Your Master Key System: A Guide for Perth Building Managers
- •A single staff departure or lost master key can compromise every lock in your building — act the same day.
- •Rekeying resets key control without replacing hardware; upgrading improves the security grade of the system itself.
- •Not every security event requires a full upgrade — knowing the difference saves significant cost.
- •Restricted keyways offer stronger long-term control than standard master key systems for high-traffic properties.
- •A licensed Perth locksmith can audit your entire access hierarchy and recommend the right response in one visit.
You manage a building with multiple access levels, dozens of keyholders, and a master key system holding it all together. When a key goes missing or a trusted staff member leaves, the question isn’t whether to act — it’s knowing exactly which action is right for your situation and how urgently you need to move.
What Is the Difference Between Rekeying and Upgrading a Master Key System?
Same hardware or new hardware — two very different problems, two different solutions.
Rekeying a master key system means a locksmith reconfigures the internal pin stacks across your cylinders so that existing keys stop working and a new set is issued. The lock hardware, door frames, and physical infrastructure stay exactly as they are — only the internal pin configuration changes.
Upgrading means replacing the master key system itself — moving to a higher security grade, a restricted keyway, or a more sophisticated access hierarchy. This is a larger investment, but it addresses the underlying security architecture rather than just resetting who holds the current keys.
As the hub article Master Key Systems Explained: The Complete Guide for Perth Property Managers covers in detail, a master key system is only as strong as the control you maintain over it. Both rekeying and upgrading are valid responses — the trigger determines which one applies.
When Does a Master Key System Need Rekeying — Not Just Replacement Keys?
These are the situations where waiting even 24 hours increases your exposure.
Staff departure is the most common and most frequently delayed trigger. When an employee who held a master or sub-master key leaves — voluntarily or otherwise — you cannot verify whether copies were made. Rekeying the affected level of your system immediately closes that gap.
Lost or unaccounted-for keys demand the same urgency. If a master key is lost and your keyway is a standard (non-restricted) type, unauthorised copies may already exist. Our related guide How to Manage Lost or Stolen Master Keys in a Perth Commercial Building walks through the exact steps to take when a master key disappears.
- •Staff member departs and does not return all issued keys
- •A master or sub-master key is reported lost or stolen
- •End of a commercial tenancy where the tenant held keyed-different locks
- •A security audit reveals keys have been issued without proper records
- •A contractor or service provider held temporary access and the key is unaccounted for
- •A break-in or attempted forced entry compromises key control confidence
Rekeying only the top level of your hierarchy is not enough. If a sub-master key is compromised, every lock that key operates needs to be rekeyed — not just the grandmaster level. A licensed locksmith can map your full access hierarchy before the job starts.
When Should You Upgrade the System Rather Than Just Rekey It?
Rekeying resets access — upgrading rebuilds the foundation your security rests on.
If your current master key system is standard keyway — meaning keys can be freely duplicated at any hardware store — rekeying buys you time, but it doesn’t solve the underlying vulnerability. Every time a key is lost, you’ll be back in the same position. Upgrading to a restricted keyway system means keys can only be cut by an authorised locksmith, giving you genuine long-term control.
Our related article Restricted Keyways vs Standard Master Key Systems: Which Is Best for Perth Properties? compares both options in detail. For buildings with high staff turnover, multiple tenants, or sensitive access zones, restricted keyways are the baseline most Perth locksmiths recommend.
Upgrading also makes sense when your access hierarchy no longer matches your building’s layout — for example, when a property expands, tenancies change, or you need to add new access levels that the current system can’t accommodate cleanly.
How Do You Know If Your Current System Is Still Fit for Purpose?
These warning signs tell you the system is working against you, not for you.
If you can’t produce an accurate, up-to-date record of every key issued in your building, your master key system has already broken down administratively — regardless of its physical condition. Poor key records are the single biggest vulnerability in commercial access control.
Locks that are stiff, corroded, or intermittently failing are a separate but equally important signal. Perth’s coastal climate accelerates corrosion on exterior hardware, and a lock that’s degrading mechanically will compromise your system’s reliability even after rekeying. In these cases, replacement of the cylinder — or the full lock — is the right call alongside any rekeying work.
Schedule a master key system audit with a licensed locksmith every time there is a significant change — new tenants, staff restructures, or building works. This is far cheaper than responding to a security incident after the fact. Our full range of locksmith services includes system audits and rekeying for commercial properties across Perth.
What Does the Installation or Upgrade Process Actually Involve?
Knowing what to expect helps you plan around your building's operations.
For a rekey, a locksmith works through each cylinder in the affected access level, replacing internal key pins and issuing new keys to match. The lock hardware stays in place and most standard commercial rekeys can be completed in a single scheduled visit — minimising disruption to your tenants or staff.
For a full system upgrade, the process involves designing the new access hierarchy, selecting the appropriate keyway and lock grade, and fitting or rekeying cylinders across the property. Our related guide Master Key System Installation: What Perth Property Managers Need to Know covers this process in detail, including what decisions you’ll need to make before a locksmith arrives.
When choosing between systems, the related article How to Choose the Right Master Key System for Your Perth Commercial Property provides a framework based on building size, tenant mix, and your required access levels — useful reading before committing to an upgrade.
Frequently Asked Questions
Quick answers to the questions Perth building managers ask most often.
Can I rekey just one level of my master key system without affecting the others?
Yes — a licensed locksmith can rekey a specific sub-master or keyed-different level without disrupting the rest of the hierarchy. However, this only works cleanly if your key records are accurate and up to date. If records are incomplete, a full audit is recommended before any targeted rekeying is done.
How quickly should I act after a master key goes missing in a commercial building?
The same day — ideally within hours. A missing master key represents potential access to every lock it operates, and in a commercial building that can mean common areas, offices, and sensitive zones. Delaying until the key reappears is a risk most building managers can’t afford to take.
Is a restricted keyway system worth the extra cost for a smaller commercial building?
For most commercial properties with more than a handful of keyholders, yes. The long-term cost of repeated rekeying after key losses typically exceeds the upfront investment in a restricted system within a few years. It also removes the administrative burden of chasing down duplicate keys made at hardware stores.
Do all the locks in my building need to be the same brand for a master key system to work?
Generally, yes — master key systems are designed within a single manufacturer’s cylinder range because pin sizes and keyway profiles are brand-specific. A licensed locksmith can advise on compatible options if you’re inheriting a mixed-brand setup or planning a staged upgrade across a large property.
Ready to Audit or Rekey Your Building's Master Key System?
Whether you need a same-day rekey after a staff departure or a full system upgrade, Andy at Ultimate Locksmith Perth can assess your property and recommend the right solution. Call 0481 365 802 any time — 24/7.
"*" indicates required fields
Part of our guide: Master Key Systems Explained: The Complete Guide for Perth Property Managers
Related reading
- ›How to Choose the Right Master Key System for Your Perth Commercial Property
- ›Master Key System Installation: What Perth Property Managers Need to Know
- ›How to Manage Lost or Stolen Master Keys in a Perth Commercial Building
- ›Restricted Keyways vs Standard Master Key Systems: Which Is Best for Perth Properties?