Quick answer: The PCBU who carries out the High Risk Construction Work is responsible for ensuring a SWMS is prepared before that work starts. The duty cannot be delegated away, even if someone else drafts the document.
Last reviewed: June 2026 by the BlueSafe Technical Team. Reflects current Australian WHS requirements.
One of the most common questions on construction sites is: who actually has to write the SWMS? The short answer is clear in the legislation, but the practical reality on site — with multiple parties, subcontractors, and competing timelines — can make it feel murkier than it is. This guide explains who holds the duty, what that duty requires, and how it works across different site arrangements.
At a glance
| Item | Summary |
|---|---|
| Who holds the duty? | The PCBU carrying out the High Risk Construction Work |
| Can someone else draft it? | Yes, but the duty stays with the PCBU |
| Are workers involved? | Yes — consultation is required before the SWMS is finalised |
| What about subcontractors? | Each subcontractor prepares their own SWMS for their own work |
| Principal contractor role | Must obtain, review, and be satisfied with each SWMS |
| When it must be ready | Before the High Risk Construction Work starts |
The PCBU who does the work holds the duty
Australian WHS legislation is specific: the duty to prepare a SWMS falls on the PCBU who is carrying out the High Risk Construction Work. Not the client. Not the principal contractor. The PCBU whose workers or contractors are actually doing the task.
If your business is the one doing the High Risk Construction Work, your business must ensure a SWMS exists before that work starts. That obligation cannot be passed to someone else simply by pointing to a head contractor or a client's requirements.
If you are unsure whether your business qualifies as a PCBU, the guide on understanding PCBU responsibilities explains the concept in detail. A PCBU is a broad category — most businesses and sole traders carrying out work will be a PCBU under the legislation.
The principal contractor's obligations
Where construction work is above a certain value, a principal contractor is appointed to manage the site. The principal contractor has its own SWMS obligations that sit alongside, but are separate from, the PCBU's duty to prepare.
The principal contractor must:
- obtain a copy of the SWMS from the PCBU before the High Risk Construction Work starts
- review the SWMS and be satisfied that it addresses the hazards and risks of the work
- ensure the SWMS is being followed during the work
- ensure the SWMS is reviewed and revised when site conditions or the work method changes
The principal contractor is not responsible for preparing the SWMS on behalf of a subcontractor PCBU. However, they are responsible for making sure one exists and that it reflects the actual work being done on their site. If a subcontractor arrives without a SWMS, the principal contractor should not allow the high-risk work to proceed.
Subcontractors prepare their own SWMS
Each subcontractor is a separate PCBU for the work they carry out. A subcontractor doing work that involves High Risk Construction Work — such as working at heights, excavation deeper than 1.5 metres, or working near energised electrical installations — must prepare their own SWMS for that work.
A subcontractor cannot rely on a SWMS prepared by the principal contractor or head contractor to cover their own work activities. The document must reflect the specific work method, hazards, and controls applicable to what that subcontractor is doing.
If you engage sub-subcontractors below you, the same rule applies. Each PCBU in the chain who carries out High Risk Construction Work must have a SWMS for their own scope.
Who can draft the document?
The legal duty is to ensure the SWMS is prepared — not necessarily to personally sit down and write every word. In practice, businesses use a range of people to draft or contribute to a SWMS:
- a site supervisor or foreperson with direct knowledge of the task
- a safety advisor or WHS consultant engaged by the business
- a senior tradesperson who will be overseeing the work
- a combination of the above, using a template as a starting point
What matters is that the person drafting the document is competent — they understand the work, the hazards, and the controls that are likely to be effective. A document drafted by someone with no understanding of the task will typically be too generic to be useful and is unlikely to satisfy the legislation.
For more on what the finished document needs to contain, see the guide on what is a SWMS.
Worker consultation is not optional
Regardless of who drafts the SWMS, workers who are going to carry out the High Risk Construction Work must be consulted before the document is finalised. This is a legal requirement under the WHS legislation, not a best practice suggestion.
Consultation does not mean circulating the document for signatures. It means genuinely seeking input from workers about the task, the hazards they expect to encounter, and whether the proposed controls are practical. Workers with hands-on knowledge of the job often identify hazards that a supervisor or safety advisor would miss.
A SWMS that workers have not been consulted on is also more likely to be ignored on site. A document drafted with worker input tends to be more accurate, more specific, and more likely to be followed.
What happens when conditions change?
The obligation does not end once the SWMS is signed. If the method of work changes, new hazards emerge, or the site conditions shift in a way that affects how the work will be done, the SWMS must be reviewed and revised before the work continues.
The responsibility for initiating that review sits with the PCBU carrying out the work. On a site with a principal contractor, that contractor also has an obligation to ensure the review happens. Workers must be consulted on any significant changes before the revised SWMS is adopted.
Common misunderstandings
"The head contractor handles the SWMS for everyone." No. The head contractor or principal contractor has review and oversight obligations but is not required to prepare a SWMS on behalf of every subcontractor. Each PCBU prepares their own.
"Our client gave us a template so we are covered." A template is a starting point only. The PCBU carrying out the work is responsible for adapting it to the actual job, hazards, and site. A client-provided template that has not been reviewed and adjusted is not a compliant SWMS.
"We got signatures so the obligation is met." Signatures show workers were present. They do not demonstrate that the SWMS accurately reflects the work, that hazards have been properly identified, or that controls are adequate. The duty is to ensure a proper SWMS exists and is followed — not just signed.
"A safety consultant prepared it so they are responsible." The PCBU carrying out the work holds the duty. Engaging a consultant to assist with the drafting is sensible, but the responsibility remains with the business doing the work.
State and territory variations
This page is based on the Model WHS framework used in most Australian jurisdictions. Terminology and specific regulator guidance can vary.
| Jurisdiction | Regulator | Key note |
|---|---|---|
| NSW | SafeWork NSW | Model WHS framework applies |
| VIC | WorkSafe Victoria | Victoria uses the OHS framework and different terminology |
| QLD | Workplace Health and Safety Queensland | Model WHS framework applies |
| SA | SafeWork SA | Model WHS framework applies |
| WA | WorkSafe WA | Model WHS framework applies with local variations |
| TAS | WorkSafe Tasmania | Model WHS framework applies |
| ACT | WorkSafe ACT | Model WHS framework applies |
| NT | NT WorkSafe | Model WHS framework applies |
Always confirm current regulator guidance for the job and jurisdiction.
Related guides
Frequently asked questions
Which PCBU must prepare the SWMS?
The PCBU carrying out the High Risk Construction Work must ensure a SWMS is prepared before that work starts. If the work is subcontracted, the subcontractor is the relevant PCBU and must prepare their own SWMS for their scope of work.
Can a worker prepare the SWMS?
Workers do not hold the legal duty to prepare the SWMS, but they must be consulted before it is finalised. In practice, the person actually doing the work often contributes directly to drafting it, and that input makes the document more accurate and practical.
What is the principal contractor's role with SWMS?
The principal contractor must obtain a copy of the SWMS from the relevant PCBU, review it, and be satisfied it addresses the hazards and controls. If site conditions or the work method change, the principal contractor must ensure the SWMS is reviewed and updated before work continues.
Can a business use a consultant or safety advisor to prepare the SWMS?
Yes. A competent safety advisor or consultant can draft the document on behalf of the business. The legal duty, however, remains with the PCBU carrying out the work. Outsourcing the drafting does not transfer the responsibility.
SWMS resources for Australian businesses
BlueSafe Online provides SWMS templates built for Australian construction businesses. Visit app.bluesafeonline.com.au to browse trade-ready documents that can be tailored to your specific work activities and site conditions.
This article is general educational information about Australian WHS requirements. It is not legal advice. Consult your state or territory WHS regulator or a qualified WHS professional for guidance specific to your situation.