Master Key Systems. Restricted Do Not Copy Keys.

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Master Key Systems / Restricted ‘Do Not Copy’ Keys

A master key system is a key plan where specific keys can open a number of pre-defined doors and are mostly made using restricted ‘do not copy’ keys.

Restricted keys can only be cut by the master locksmith that supplied the master key system and only after approval from an authorising signatory from the client.

Example – an apartment building has 12 units with a common entrance, each unit has a unique key that can open the common door, but not other units.

When to select a Master Key System?

A Master Key System with restricted ‘do not copy’ keys may be the solution if:

✔ you require a higher level of security as they are harder to pick than standard domestic key systems

✔ you need to share your keys with multiple people, staff and/or trades and services

Stewart Locksmiths can convert your existing lock to accept a restricted do not copy key i.e. often you do not need to replace the lock as well.

We offer the design, supply, installation and maintenance of Restricted Master Key Systems allowing you to share your key knowing it can’t be duplicated without authorisation. Servicing both residential and commercial premises including body coporates and real estate agencies.

Get a Quick Estimate for changing a key or getting a new lock installed…

Doors and locks differ so please be aware this is an estimate ONLY, exact pricing will be quoted prior to the commencement of any work. Please provide your contact details to receive a prompt response.

For all other enquiries please complete the form below and we’ll contact you with an estimate ASAP.


or contact us anytime…

By email, by phone

Service Area

Based in South Yarra, we service the Melbourne area.
Call for pricing outside this area.



0468 433 988

Working hours

24 hours a day
7 Days a week

Postal Address

PO Box 310
South Yarra Vic 3141


Some words from our customers…..

Very professional

I used Stewart Locksmiths to open my front door when I was locked out. Ben arrived 25minutes later, opened my door and was great. Very professional and price wasn’t bad either

Tim J.

Fast & easy

Fast, easy service from a friendly technician, thanks Stewart Locksmiths

Wendy P
Mont Albert

Fair price

The price was fair and the service was really friendly

Marnie R

Cleaned up afterwards

I needed my locks changed the same day and while they were busy, they went out of their way to accommodate me into their schedule. They changed my door locks and even cleaned up afterwards.

Mark A

On time

My warehouse had a lock that was sticking and Stewart Locksmiths did a great job fixing it! The locksmith arrived on time, was professional, and finished the job in less than 30 minutes. Our door is working perfectly!

Matt D

The locksmith was great

I had a problem with my front door lock for months that was so annoying, you had to wiggle the key for it to open. Stewart Locksmiths came out when convenient for me and fixed it!

Kate T

Products / Brands

We only ever use quality products. We are proud to use products from…..

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