A Landowner Guide to Principal Contractor Obligations in NSW for Construction Over $250,000

Introduction to Principal Contractor Obligations in NSW

Landowners in NSW who undertake construction projects valued at over $250,000 must navigate important obligations under work health and safety (WHS) laws. Many are unaware that by commissioning this work, they can unintentionally become the principal contractor, assuming significant legal responsibilities for site safety under the Work Health and Safety Regulation 2025 (NSW).

This guide explains the circumstances that trigger these duties for a landowner principal contractor in NSW. It outlines the key principal contractor WHS obligations NSW requires, the serious risks of non-compliance, and the practical steps landowners can take to manage their responsibilities effectively.

Check If You Are the Principal Contractor & Your Safety Duties

Understanding Principal Contractor Obligations in NSW

The $250,000 Threshold for Construction Projects

This article provides an overview of Principal Contractor Obligations in NSW and the essential steps landowners must take to ensure compliance with WHS regulations. In New South Wales, a landowner automatically becomes the principal contractor when the construction project is valued at $250,000 or more.

The Work Health and Safety Regulation 2025 (NSW) requires the person commissioning the work—usually the landowner—to appoint a principal contractor in writing before any work begins. Where no written appointment is made, two immediate consequences follow:

• The landowner inherits all legal duties and responsibilities for WHS on the site.
• The $250,000 threshold covers the entire project cost, including every component of labour and materials, rather than the value of any single contract.

Defining a Person Conducting a Business or Undertaking

The term ‘Person Conducting a Business or Undertaking’ (PCBU) is a broad legal concept under WHS law. It can refer to various entities, including:

• Self-employed Individuals.
• Companies such as retailers or manufacturing businesses.
• Government agencies or any other organisation that manages an undertaking.

When a landowner commissions construction work valued above $250,000, they are treated as a PCBU. As such, the landowner has a primary duty to ensure, so far as is reasonably practicable, the health and safety of workers and others affected by the work on their property.

If the landowner wishes to avoid these responsibilities, they must formally delegate the role in writing to another competent PCBU; otherwise, all principal contractor obligations remain with them by default.

Key Principal Contractor WHS Obligations Under NSW Law

Preparing & Maintaining a WHS Management Plan

Under Section 309 of the Work Health and Safety Regulation 2025 (NSW), a principal contractor must prepare a written WHS Management Plan before any construction work begins. The contractor then has an ongoing duty, under Section 311, to review and revise the plan so it always reflects current site conditions.

A compliant WHS Management Plan must include enough detail to address site safety comprehensively. Key components required by the regulation include:

• Personnel and Responsibilities: the names, positions, and specific health-and-safety duties of all key personnel.
• Consultation Arrangements: procedures for consultation, cooperation, and coordination between the different businesses on-site.
• Incident Management: arrangements for reporting, investigating and managing any WHS incidents that occur.
• Site-Specific Rules: a clear outline of the site’s rules, together with methods for informing everyone on-site.
• SWMS Management: processes for collecting, assessing, monitoring and reviewing Safe Work Method Statements (SWMS) for high-risk construction work.

Installing & Displaying Correct Site Signage

Under Section 308 of the Work Health and Safety Regulation 2025 (NSW), the principal contractor must install signage at the construction site that is clearly visible from outside the workplace or main work area. This signage identifies who is responsible for the site and supplies essential contact details for workers, visitors and emergency services.

The signage must display the following information:

• Principal Contractor’s Name: the full legal name of the contractor.
• Telephone Contact Numbers: daytime numbers plus an after-hours contact.
• Site Office Location: directions to the site office, if one exists.

Managing General Site Risks & Essential Services

The principal contractor’s WHS duties in NSW also require them to manage health and safety risks associated with the overall site environment and its interaction with the public. Section 315 obliges the contractor to oversee site logistics and utilities so both workers and the community remain safe.

These duties include managing risks related to:

• Construction Materials and Waste: safe storage, movement, and disposal of all materials and waste produced on-site.
• Plant and Equipment: secure storage of any plant or machinery that is not in use, preventing accidents.
• Traffic Management: controlling traffic in areas affected by construction activities around the workplace.
• Essential Services: safeguarding electricity, water, gas, and other critical utility lines that run through or near the site.

Managing High-Risk Construction Work & Safe Work Method Statements

Identifying High-Risk Construction Work in NSW

Certain activities on a construction site are classified as high-risk construction work because they carry a genuine potential for serious injury or death. A principal contractor must therefore ensure appropriate safety measures are firmly in place before any of these tasks commence.

Examples of activities defined as high-risk construction work in NSW include:

• Work at heights where a fall of more than two metres is possible.
• Demolition work that involves load-bearing elements and could compromise structural integrity.
• Asbestos removal or any task that disturbs asbestos-containing materials.
• Work in a confined space or tunnel, posing risks of oxygen deficiency or atmospheric contaminants.
• Activities near energised electrical services or close to chemical, fuel, or refrigerant lines.
• The use of explosives for any purpose on the construction site.
• Processing crystalline silica, generating respirable silica dust—an area of heightened focus since mandatory silica awareness training became compulsory in September 2024.

A Principal Contractor’s Duty to Obtain & Review Safe Work Method Statements

For any high-risk construction work, a SWMS must be prepared by the subcontractor undertaking the task. Under Section 312 of the Work Health and Safety Regulation 2025 (NSW), the principal contractor must take all reasonable steps to obtain the SWMS before the work starts.

The principal contractor’s responsibilities for SWMS in NSW include:

• Obtaining the SWMS from the subcontractor before they commence the high-risk activity.
• Reviewing the SWMS to confirm it is site-specific and adequately addresses identified risks, hazards, and control measures.
• Ensuring compliance by monitoring that the work is carried out exactly as the SWMS prescribes.
• Requiring revisions when a SWMS is inadequate, ensuring amendments reach an acceptable standard before authorising work to proceed.

The Risks & Penalties for WHS Non-Compliance

Potential Penalties from SafeWork NSW

A landowner principal contractor in NSW who fails to meet their WHS obligations faces significant enforcement action from SafeWork NSW. Consequently, the regulator has several tools to ensure WHS compliance construction NSW landowners adhere to.

SafeWork NSW can issue formal notices to address safety breaches, including:

• Improvement Notices: These require a person to fix a specific WHS breach within a designated timeframe.
• Prohibition Notices: These are more serious and require work to be stopped immediately until a safety issue is resolved.

For major breaches of the Work Health and Safety Act 2011 (NSW), the penalties can be severe. A PCBU may face significant consequences, such as:

• Substantial fines, reaching up to 30,000 penalty units.
• Potential imprisonment for individuals in the most serious cases.

Recent Case Studies on Principal Contractor Liability

Court decisions highlight the serious consequences for principal contractors who fail to manage site safety, making it crucial to understand methods for resolving construction disputes without courts. These cases demonstrate how WHS laws are applied and the financial penalties that can result from non-compliance.

In SafeWork NSW v Coplex Construction Pty Ltd [2023] NSWDC 165, a worker suffered fatal injuries after falling 19 metres through an uncovered penetration on a roof. The principal contractor, Coplex, was fined $405,000 for several failures, which underscores their duty to actively enforce safety protocols:

• Failing to ensure adequate fall prevention measures were in place.
• Not properly verifying the subcontractor’s SWMS.

Another example is SafeWork NSW v Apex Building Systems Pty Ltd [2023] NSWDC 14, where two workers were injured after falling four metres from an excavator bucket being used improperly as a work platform. The principal contractor received a fine of $180,000 for the following breaches:

• Failing to conduct a proper risk assessment for demolition work.
• Not providing adequate fall protection.

The case of SafeWork NSW v The Owners – Strata Plan No 93899 [2024] NSWDC 277, shows that these duties extend beyond typical construction firms.

An Owners Corporation was fined $225,000 after a worker was fatally crushed by a damaged sliding gate that had not been repaired or taken out of service. This situation underscores the importance of seeking legal advice for an owners corporation to manage WHS risks. Ultimately, this highlights that any PCBU with control over a workplace, including a strata body, can be held responsible.

However, the decision in Diona Pty Ltd v SafeWork NSW [2024] NSWIRComm 1068, provides important clarification on the limits of a principal contractor’s liability. In this case, an improvement notice issued to Diona was cancelled. The Industrial Relations Commission found that a principal contractor is not automatically liable for every safety matter, confirming they may not be held responsible for a subcontractor’s specific actions if they have:

• Implemented robust WHS management systems.
• Engaged an expert subcontractor for specialised tasks.

Practical Steps for Landowners to Mitigate WHS Risks

Formally Delegating Principal Contractor Duties in Writing

A landowner can avoid assuming principal contractor responsibilities by formally delegating these duties to another party. This transfer of obligations must be documented in a written contract to be legally effective, highlighting the importance of properly drafting construction contracts. A verbal agreement is not sufficient to protect the landowner from liability.

The delegation should clearly outline the principal contractor duties that the appointed party is accepting. If the original construction contract did not include this delegation, a separate, supplemental agreement can be created to formally transfer the responsibilities.

Verifying a Contractor’s WHS Competency & Systems

Before appointing a principal contractor, landowners should conduct thorough due diligence to confirm the contractor is qualified to manage the principal contractor WHS obligations NSW requires. This is a critical step in ensuring site safety and mitigating the landowner’s own risk.

Key areas to investigate include:

• Verify Expertise: Confirm the contractor holds the necessary licences and qualifications and has relevant experience with similar projects.
• Review Safety Systems: Check for established and robust WHS policies, procedures, and management plans.
• Confirm Work Practices: Ensure the contractor has a track record of enforcing their safety rules and procedures on-site.

Even after delegating duties, landowners should maintain open communication with the contractor. Regular consultation and cooperation are important for addressing any safety issues that may arise during the construction project.

Conclusion

Landowners in NSW undertaking construction projects over the $250,000 threshold must understand their principal contractor obligations, from preparing a WHS Management Plan to managing high-risk work, to avoid substantial penalties. With workplace protections broadly strengthened by amendments to the Work Health and Safety Act 2011 (NSW) in October 2025, proactive risk management and the formal delegation of duties are critical for ensuring compliance.

Navigating these complex principal contractor WHS obligations in NSW requires specialised legal knowledge. To ensure your project meets all legal and safety requirements and to protect against potential liabilities, contact PBL Law Group’s building and construction lawyers for trusted guidance on WHS compliance and construction law today.

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