How Much Does a Restricted Key System Cost for a Home?
August 7, 2026
A restricted key system for a typical home with three to five keyed doors costs between $400 and $900 in the Bayside Melbourne area, depending on cylinder grade and the number of keys required. This covers restricted-profile cylinders, key cutting, and installation. Additional keys cut later carry a per-key cost and require identity verification. The premium over standard cylinders buys control over who can duplicate your keys, which standard hardware cannot provide.
Standard house keys can be copied at any hardware store, key kiosk, or shoe repair counter for a few dollars, by anyone holding the key, without any record being kept. For most households this is not a problem — until it becomes one. A tradesperson who was given a key during renovations, a former housemate, a cleaner, an ex-partner, or anyone else who has held your key for even a short period could have a working copy that you have no way of knowing about.
A
restricted key system removes that possibility. Understanding what it costs and what the cost covers helps decide whether it is worth it for your situation.
What Makes a Key Restricted
A restricted key uses a patented keyway profile — a physical key blade shape that is protected by patent and manufactured only under licence. Blank keys for that profile are not sold to general key cutting outlets. They are supplied only to locksmiths authorised by the manufacturer, and those locksmiths are contractually obliged to verify authorisation before cutting.
The practical effect is that a copy of your key cannot be obtained from a hardware store, a kiosk, or an unauthorised locksmith. Anyone wanting a copy must go to the specific locksmith holding your system on file, prove they are authorised to hold a key for that property, and have the cut recorded.
Patent protection versus a stamp.
A key stamped "do not duplicate" carries no legal weight and does not prevent copying. Many key cutting operations will copy such a key without question. Restricted keys work because the blank simply is not available, not because of a request printed on the key.
What the Cost Covers
Restricted cylinders.
The cylinders themselves cost more than standard equivalents. A basic restricted cylinder starts around $80 to $120 per cylinder in the Australian market, with higher-security restricted cylinders incorporating anti-pick, anti-bump, and anti-drill features running $150 to $250 each.
Key cutting.
Keys for a restricted system are cut on the locksmith's equipment to the specific code for your system. An initial set of three to four keys is typically included in an installation quote.
System registration.
Your system is registered with the locksmith and, depending on the platform, with the manufacturer. This registration is what enables identity verification when someone requests a copy. It is an administrative service that continues for the life of the system.
Installation.
Fitting the cylinders to existing lock bodies, or fitting complete locksets where existing hardware needs replacing.
Typical Total Costs
Three doors, entry-level restricted cylinders.
Around $400 to $550 including cylinders, three keys, and installation.
Four to five doors, mid-grade restricted cylinders with anti-pick and anti-bump features.
Around $650 to $900.
Larger property or higher-security specification.
Costs scale with the number of keyed points and the cylinder grade. A large property with six or more keyed doors and high-security cylinders may run $1,200 or more.
Additional keys later.
Typically $25 to $60 per key depending on the platform, requiring identity verification at the time of cutting.
When It Is Worth the Premium
After a tenancy or shared living arrangement.
If your property has been occupied by others who had keys, a restricted system establishes a clean baseline where you know exactly how many working keys exist.
Following renovation or trade access.
Extended building works frequently involve keys being held by contractors, sometimes passed between subcontractors. A restricted system after works complete resets key control entirely.
Landlords benefit substantially, because a restricted system means a departing tenant cannot have left copies in circulation. New keys issued at the start of each tenancy come from a controlled source.
Where the property holds high-value contents.
Homes with significant valuables, artwork, or collections justify the additional control that restricted systems provide.
For peace of mind after a specific concern.
A lost key, a relationship breakdown, or an unexplained event at the property are all common triggers.
What It Does Not Do
A restricted key system controls duplication. It does not, on its own, make the lock harder to force, pick, or drill unless the cylinder specified also carries those security features. Restricted profile and high-security construction are separate attributes — a cylinder can have one without the other.
When specifying a restricted system, it is worth confirming whether the cylinders also carry anti-pick, anti-bump, and anti-drill features, particularly for external doors. The cost difference between a basic restricted cylinder and a high-security restricted cylinder is modest relative to the total job.
Frequently Asked Questions
Can I add restricted cylinders to my existing locks?
In most cases yes, provided the existing lock bodies accept a standard cylinder format. Euro profile lock bodies, which are common in Australian homes, accept restricted euro cylinders directly. Older mortice locks may require a different approach. A locksmith can confirm compatibility on inspection.
What happens if I lose a restricted key?
Because the profile cannot be copied without authorisation, a lost restricted key is less of a security risk than a lost standard key. If the key is found by someone who can identify the property, the risk still exists, and rekeying the affected cylinders may be advisable. The locksmith holding your system can advise based on the circumstances.
How do I get extra keys cut?
Contact the locksmith who installed the system. You will be asked to verify your identity and your authorisation to hold keys for that property. Once verified, the key is cut to your system's code and the cut is recorded. This process is the mechanism that makes the system secure.
What if my locksmith goes out of business?
Reputable restricted key platforms are backed by the manufacturer, and system records are held at manufacturer level as well as with the installing locksmith. Another authorised locksmith on the same platform can usually take over servicing. It is worth asking about this at the point of installation.
Is a restricted system worth it for a rental property?
For landlords and property managers, restricted systems address the core risk of tenancy turnover — that departing tenants may have made copies. The upfront cost is offset over multiple tenancies by reducing the need for full rekeying at every changeover.
Contact True Locksmith
on 0421-767-767
for restricted key system supply and installation across Bayside Melbourne. Neale can assess your existing hardware, recommend the appropriate cylinder grade, and register your system so that only authorised people can ever obtain a copy of your keys. MLAA member and VIC Police registered. Serving Sandringham, Brighton, Brighton East, North Brighton, Beaumaris, Bentleigh, Black Rock, Caulfield, Cheltenham, Hampton, Highett, McKinnon, Mentone, Moorabbin, Mordialloc, and Parkdale.