What Is a PCBU? Understanding the Primary Duty of Care Under Australian WHS Laws

Under Australian Work Health and Safety (WHS) legislation, the term PCBU stands for Person Conducting a Business or Undertaking. But what is a PCBU?

The simplest explanation is that it identifies who is legally responsible for workplace health and safety. The focus isn’t on titles or hierarchy; it’s a clear framework for understanding where the primary duty of care sits and how workplace safety should be managed.

At its core, the PCBU framework ensures that anyone conducting a business or undertaking is accountable for the work workers carry out.

What is a PCBU?

A PCBU (Person Conducting a Business or Undertaking) is the individual or organisation that holds the primary duty of care under WHS laws.

So, when considering the questions of ‘what is PCBU’, it isn’t defined by job title alone, but by whether a person or organisation is conducting a business or undertaking.

A PCBU can include:

• A sole trader operating independently
• A partnership conducting business activities
• A company or incorporated organisation
• An unincorporated association
• A government department or statutory authority

Defining WHS obligations broadly ensure they apply across all forms of work arrangements, spanning small businesses to large government operations.

The key principle is simple: if you’re conducting a business or undertaking, you are a PCBU and therefore responsible for carrying out health and safety duties.

Communicating the key responsibilities of a PCBU

A PCBU has a legal duty to maintain the health and safety of anyone who may be affected by the business or undertaking. This responsibility is ongoing and hazards must be identified and controlled prior to harm.

Key responsibilities include:

Providing and maintaining a safe working environment

PCBUs must ensure – so far as is reasonably practicable – that a workplace is safe and without risks to health. This includes maintaining a consistently safe working environment across all operations.

Providing and maintaining safe plant and structures

All equipment, machinery and structures must be safe to use at all times. In practice this means they’re properly maintained and suitable for the work being carried out.

Providing safe systems of work

Work processes must be designed and implemented to reduce risk, including procedures for routine and high-risk tasks. Strong project management practices play a key role in the planning, communication,and application of these systems.

Safe handling of plant, structures, and substances

PCBUs must prioritise the safe handling, usage, storage and disposal of hazardous materials and equipment.

Providing adequate facilities for workers’ welfare

Workers must have access to appropriate facilities such as drinking water, toilets, washing areas, and rest spaces where required.

Providing information, training, instruction, and supervision

Workers must be given the necessary knowledge and supervision to perform tasks safely and competently.

Monitoring workplace conditions and worker health

PCBUs are required to monitor workplace conditions and worker health in cases where risks exist.

What does “reasonably practicable” mean?

The term reasonably practicable is central to WHS obligations. It refers to what a PCBU can reasonably do to eliminate or minimise risks, taking into account:

• The likelihood of the hazard occurring
• The severity of potential harm
• What is known (or should reasonably be known) about the risk
• Available control measures
• The cost of controls relative to the level of risk

In practice, it means PCBUs are expected to carry out reasonable steps to create and maintain safe working conditions for all, rather than relying on minimum compliance alone.

Who is not a PCBU?

Not every person in a workplace is a PCBU. For example; employees, contractors and workers are not PCBUs under WHS legislation. Instead, they have their own duties, which generally include:

• Taking reasonable care for their own health and safety
• Ensuring their actions do not negatively impact others
• Following reasonable instructions provided by the PCBU

The distinction is important:

• A PCBU manages the business and its risks
• A worker carries out tasks within that system safely

What if there are multiple PCBUs in a workplace

Many workplaces will have multiple PCBUs operating at the same time. In construction or large-scale operations, there may be a principal contractor alongside multiple subcontractors – all of whom may be PCBUs.

Here, each PCBU retains its own duty of care. However, they must also:

• Consult with one another
• Cooperate on shared risks
• Coordinate activities to ensure safety is not compromised

This is particularly important should project management structures involve multiple teams working across overlapping scopes of work.

The risk of non-compliance

Failure to comply with WHS obligations can result in significant penalties for PCBUs, particularly where breaches lead to serious injury, illness, or death.

Beyond financial penalties, non-compliance can also result in:

• Regulatory enforcement action
• Operational disruption
• Reputational damage
• Increased scrutiny from regulators

Because of these risks, many organisations are strengthening their WHS systems with digital tools.

The WHS Monitor app helps PCBUs maintain compliance by centralising incident reporting, risk assessments and safety documentation. It supports better oversight of WHS obligations and provides a clear audit trail of safety activity. This enables an organisation to quickly demonstrate compliance if necessary.

Final thoughts

Understanding what a PCBU is remains fundamental to understanding wider Australian WHS law. Whether operating as a sole trader or a large organisation, every PCBU has a legal obligation to maintain a safe working environment, manage risks and protect workers.

When supported by structured systems, strong project management practices, and digital safety tools, these obligations become easier to manage consistently and effectively across all workplaces.