WHS principal contractor obligations on NSW residential building sites

What principal contractor means

Under the Work Health and Safety Regulation 2017 (NSW), the principal contractor (PC) is the person conducting a business or undertaking (PCBU) appointed to manage a construction project. The PC carries a layered set of duties on top of the general WHS duties every PCBU on site already holds.

For most residential building projects above the dollar threshold, the head builder is the principal contractor. The PC role is not automatic. Where multiple builders work on a project, or where the homeowner uses an owner-builder model with contractors, the PC must be expressly appointed.

The $250,000 threshold

The PC duties under Chapter 6 of the WHS Regulation 2017 apply where the cost of the construction project is $250,000 or more. Below the threshold, the general WHS duties still apply but the specific PC duties (WHS management plan, induction obligations, consultation requirements set in Chapter 6) do not.

The cost is the total construction work cost on the project, not a per-contract figure. A small renovation that ends up costing $260,000 across variations is still over the threshold. Builders who deliberately structure work to stay below the threshold are unlikely to succeed if SafeWork NSW audits and finds the actual cost crossed it.

The WHS management plan

A WHS management plan must be in writing and prepared by the principal contractor before construction work commences. Regulation 309 sets the required content. The plan must include:

The names and roles of the people who manage WHS at the project (the PC, site supervisor, safety adviser if applicable).

Arrangements for consultation, co-operation and co-ordination of activities between PCBUs on the project (regulation 313).

Site security arrangements including who can enter the site and how access is controlled.

Site rules and procedures for managing identified hazards, including arrangements for high-risk construction work.

Arrangements for the collection, assessment, monitoring and review of SWMS.

The plan must be site-specific, in writing and given to workers including subcontractors. It must be reviewed and updated when there is a significant change to the construction work or to the management of WHS at the site.

Safe Work Method Statements for high-risk construction work

A Safe Work Method Statement (SWMS) is required for every category of high-risk construction work (HRCW) regardless of the project value. SWMS are required even on small jobs below the $250,000 PC threshold; the obligation flows from Chapter 6 Part 6.3 of the Regulation, not from the PC duty itself.

The SWMS must identify the hazards involved in the high-risk work, state the controls used to manage each hazard and describe how the controls are implemented, monitored and reviewed. The SWMS must be developed in consultation with the workers doing the work.

Where the project has a principal contractor, the SWMS for HRCW must be given to the PC before the work starts. The PC must keep the SWMS for the duration of the work and for at least two years, or until any related notifiable incident has been closed out.

The 18 categories of high-risk construction work

The WHS Regulation 2017 lists 18 categories of high-risk construction work. The common categories that affect residential building include:

• Work involving a risk of a person falling more than 2 metres
• Work on or near energised electrical installations or services
• Work in or near a confined space
• Work involving the disturbance of asbestos
• Work involving structural alterations or repairs requiring temporary support to prevent collapse
• Work in or near a trench or shaft deeper than 1.5 metres
• Work involving the use of explosives
• Work involving tilt-up or precast concrete elements
• Work on or adjacent to roadways or railways used by traffic

The full list also covers diving work, contaminated land, demolition of load-bearing parts, work at pressurised gas distribution mains and other categories. Any one of these triggers the SWMS requirement.

Site induction and consultation

The PC must arrange WHS induction training for each person who will work at the site. The induction must include site-specific information about the project hazards, emergency procedures, location of facilities and the WHS management plan.

Consultation with workers and other PCBUs at the project is a continuing duty under sections 47 and 48 of the WHS Act. The PC must consult on matters including identification of hazards, decisions on controls, changes to the work and the resolution of WHS issues.

Notifiable incidents

The PC and other PCBUs on site must notify SafeWork NSW immediately of any notifiable incident: a death, serious injury or illness, or a dangerous incident (collapse, uncontrolled escape of hazardous substance, fall from height and other categories). The site involved in the incident must not be disturbed until SafeWork NSW directs otherwise, except to assist an injured person or to make the site safe.

Principal contractor duties run alongside PCBU duties

The PC duty does not replace the WHS duties of other PCBUs on site. Every subcontractor and every PCBU continues to owe their own duty to ensure the health and safety of workers and others. The PC layer adds project-level coordination duties on top.

This means a residential builder operating as PC on a $300,000 renovation is responsible for both their own work as a PCBU (their own workers, their own equipment, their own SWMS) and the project-level PC duties (WHS management plan, site induction, consultation between PCBUs, holding subcontractor SWMS).

Penalties

Breaches of the PC duties under Chapter 6 carry significant penalties. A category 1 offence (reckless conduct causing risk of serious injury or death) carries penalties up to $3 million for a body corporate and up to 5 years imprisonment for an individual. Lower-tier offences carry penalties in the hundreds of thousands of dollars range. Most enforcement is via improvement notices, prohibition notices and infringement notices rather than prosecution.

Practical implications

For residential builders, three habits make PC compliance manageable.

Build the WHS management plan from a current template (HIA, Master Builders or SafeWork NSW sample) and adapt it to each project before work starts. Generic plans copied verbatim across projects do not satisfy the site-specific requirement and tend to fail audits.

Collect a current SWMS from each subcontractor performing high-risk construction work before they start. Read it. If it does not address the hazards on this site, request a revised version before the work commences.

Run site induction at the start of each subcontractor's first day. Keep the induction register on the project file. Repeat the induction for any worker who has been off site for more than two weeks.

Related entries

Asbestos work is one of the HRCW categories and is covered in detail in the asbestos-residential-renovations entry. WHS duties intersect with the contractor licence framework in the builder-licence-classes entry. Workers compensation for injured workers is covered in the workers-compensation-residential-builders entry; PC duty and workers compensation are separate but complementary.