A key stamped “Do Not Duplicate” can be confusing.

Some people assume it means the key cannot be copied at all. Others assume it is only a warning and can be ignored.

The real answer depends on the key.

A “Do Not Duplicate” stamp is not always the same as a true restricted key system. Some keys are standard keys with a warning stamped on them. Others are part of a controlled or restricted key system where copies are only supplied through an authorised locksmith or supplier.

Note: A stamped warning and a restricted key system are related ideas, but they are not always the same thing. The key type, property rules and approval process still matter.

Restricted key systems are commonly used to improve the security of a building or site. By controlling who can order keys, who can approve them, and how issued keys are recorded, the building manager, owners corporation, property manager or site owner can keep better control over who has access.

If a restricted or “Do Not Duplicate” key is copied without approval, that control can be weakened. There may be more keys in circulation than expected, records may become inaccurate, and the people responsible for the site may no longer have a clear view of who can access the building.

If the key is for an apartment building, commercial site, school, office, managed property or master key system, there may also be an approval process before another key can be supplied.

What does “Do Not Duplicate” mean?

“Do Not Duplicate” usually means the key owner does not want copies made casually.

It may have been stamped by:

  • a locksmith
  • a building manager
  • a property manager
  • a landlord
  • a business
  • a school or facility
  • another organisation managing access

The stamp is a warning that the key should not be copied without permission.

But the stamp alone does not tell you everything.

To understand whether the key can be copied, you need to know what type of key it is and whether it belongs to a controlled key system.

A stamped key is not always a restricted key

Not every key stamped “Do Not Duplicate” is technically restricted.

There are two common situations.

The first is a standard key that has been stamped “Do Not Duplicate”. The key blank may still be widely available, but the person or organisation responsible for the property does not want unauthorised copies made.

The second is a genuine restricted key. This type of key is usually controlled through a restricted key system. The blank may only be available to authorised locksmiths or suppliers, and the locksmith may need approval before supplying a copy.

That difference matters.

A standard stamped key may be physically easy to copy. A restricted key may not be copyable by a normal key-cutting counter because the correct blank is controlled or unavailable.

For more background, see what is a restricted key?.

Can a locksmith copy a Do Not Duplicate key?

A locksmith may be able to copy some keys stamped “Do Not Duplicate”, but they may refuse to do so without authority.

This depends on:

  • the type of key
  • whether the key blank is available
  • whether the key is part of a restricted key system
  • who owns or controls the key system
  • whether approval is required
  • the locksmith’s own policies
  • any agreement or record attached to the key system

If the key is restricted, the locksmith may need to confirm that the person requesting the copy is authorised.

If the key belongs to a building or managed property, the locksmith may need approval from a building manager, owners corporation manager, strata manager, property manager, landlord or authorised signatory before supplying another key.

Can Bunnings or a key kiosk copy a Do Not Duplicate key?

A hardware store or self-service key kiosk may be able to copy some standard keys.

However, they may not be able to copy a restricted key, high-security key, apartment building key or key that uses a controlled blank.

Even if the machine can physically read the key shape, the correct blank may not be available.

In other cases, staff may decline to copy a key if it is stamped “Do Not Duplicate” or appears to be part of a restricted system.

If the key is for an apartment building, commercial site, school, office or managed property, it is usually better to ask who the authorised locksmith or supplier is rather than trying random key-cutting locations. For a location-focused version of this question, see where can I get a restricted key copied?.

Is it illegal to copy a Do Not Duplicate key?

This article is not legal advice.

In practical terms, the stamp alone does not answer the question. The key type, ownership, authorisation process and circumstances matter.

A “Do Not Duplicate” stamp may be a warning from the key owner or property manager. A restricted key may also be controlled by the key system, supplier arrangements or building rules.

If the key gives access to a property you do not own or manage, you should not assume you are allowed to copy it just because you physically have the key.

For rentals, apartments, workplaces, schools and managed buildings, ask the person or organisation responsible for the property before trying to copy the key.

Why restricted key control matters

A restricted key system is not only about the physical key. It is also about the records and approval process behind the key.

For a building or site, key control can help answer important questions:

  • who has been issued keys?
  • who approved those keys?
  • how many keys are in circulation?
  • which doors or areas can those keys access?
  • who collected or received the keys?
  • what happened when a key was lost or replaced?

This information helps the people responsible for the site manage access more carefully.

The Locksmiths Guild of Australia Code of Practice is one local industry reference that describes restricted key procedures as including records of keys cut and the identity of people receiving them.

If keys are copied outside the authorised process, those records may no longer match reality. A building manager, owners corporation, property manager or site owner may believe only a certain number of keys exist, when additional unapproved copies have been made.

That can compromise the security of the site.

Why some keys need approval

Restricted keys are used where access needs to be controlled.

Before supplying another key, the locksmith or authorised supplier may need to confirm:

  • which restricted key system the key belongs to
  • whether the requester is authorised
  • whether an authorised person has approved the request
  • how many keys are being requested
  • who will collect or receive the key
  • whether the key issue needs to be recorded

This helps keep the key system controlled.

If keys are copied without approval, records can become inaccurate and the person responsible for the building may lose track of who has access.

For a deeper explanation, see why restricted keys need approval.

What if the key is for an apartment?

Apartment keys are often controlled.

The key may open:

  • your apartment door
  • the building entry
  • common areas
  • a lift
  • a car park
  • a garage
  • a storage area
  • a service area

Even if you live in the apartment, you may still need approval before another key is supplied.

Depending on the building, approval may need to come from:

  • the owners corporation manager
  • the strata manager
  • the building manager
  • the property manager
  • the lot owner
  • an authorised signatory recorded against the key system

If you are renting, start with your property manager or landlord unless the building has given you a specific key ordering process.

For more detail, see how to order an apartment key.

What if the key is for a workplace or commercial site?

Workplace and commercial keys may also be controlled.

The business, facility manager or site manager may need to approve copies before a locksmith can supply them.

This is especially common where the key is part of a master key system or gives access to areas such as offices, storerooms, plant rooms, warehouses, shared facilities or staff-only areas.

If you are an employee or contractor, ask the site manager, facilities team or authorised person before trying to copy the key.

What information may be needed to order another key?

If the key cannot be copied casually, you may need to place a proper restricted key order.

You may be asked for:

  • your name
  • phone number
  • email address
  • building, site or property address
  • apartment, lot, unit or tenancy number
  • key number or marking, if known
  • type of key required
  • quantity required
  • reason for the request
  • authorised approver details
  • payment method
  • collection or delivery preference
  • nominated collector details

The exact information depends on the locksmith, key system and property process.

For the general ordering process, see how to order a restricted key.

Why a proper order process is better than trying to bypass the system

Trying to copy a restricted or controlled key at a hardware store, kiosk or unrelated locksmith may waste time.

The key may not be copyable there. The blank may not be available. The store may refuse. The copy may not work properly. Or the copy may not be authorised by the person responsible for the property.

More importantly, bypassing the authorised process can undermine the purpose of the restricted key system. If extra keys are made without approval or records, the building or site may no longer have reliable control over who has access.

A proper order process helps make sure:

  • the correct key is identified
  • the right system is checked
  • approval is recorded
  • payment is handled clearly
  • collection or delivery is controlled
  • the order record is retained

This is especially important for apartment buildings, commercial properties and managed sites.

What should you do if you need another key?

If your key says “Do Not Duplicate”, the safest path is:

  1. Check whether the key belongs to an apartment, building, workplace or managed property.
  2. Ask the property manager, building manager, site manager or owner who can approve new keys.
  3. Find out who the authorised locksmith or supplier is.
  4. Submit the required details.
  5. Wait for approval, if required.
  6. Arrange payment and collection or delivery.

If it is only a standard household key that you own and control, a locksmith may be able to advise whether it can be copied. The Master Locksmiths directory can help with Australian locksmith searches.

If it is part of a restricted key system, follow the authorised order process and confirm which locksmith or supplier is authorised for that system.

Why online ordering can help

Do Not Duplicate and restricted key requests can become confusing when the process relies on paper forms, emails and phone calls.

A structured online process can make it clearer:

  • who requested the key
  • what key is being requested
  • which building or site it relates to
  • who needs to approve it
  • whether approval has been received
  • whether payment is required or complete
  • whether the key is ready for collection or delivery
  • what record exists of the order

Online ordering does not remove the need for approval. It makes the process easier to follow. For locksmiths, the same idea is covered in more detail in restricted key ordering software for locksmiths.

Where KeyOrders fits

KeyOrders is being developed to help locksmith businesses manage restricted key requests through a structured online ordering and approval workflow.

It is designed to help locksmiths collect request details, manage authorised approval, track payment status, record fulfilment information and keep clearer order records.

For locksmiths, this can reduce manual follow-up and make restricted key orders easier to review and action.

For customers, tenants, property managers, building managers and authorised signatories, it can make the process clearer and easier to understand.

Summary

A key stamped “Do Not Duplicate” may or may not be part of a true restricted key system.

Some stamped keys are standard keys with a warning. Others are controlled keys that must be ordered through an authorised locksmith or supplier.

Restricted key systems are used to improve building and site security by controlling and recording who can receive keys. If restricted or “Do Not Duplicate” keys are copied without approval, that can compromise the security of the building or site and make key records unreliable.

If the key belongs to an apartment, workplace, school, commercial site or managed property, do not assume it can be copied casually. Check who controls the key system and follow the proper approval process.

That is usually the clearest and safest way to get another key.