Quick answer: Yes. A subcontractor that is a PCBU and is carrying out High Risk Construction Work must prepare its own SWMS for that work. The principal contractor's SWMS does not substitute for it. Both duty holders have obligations that must be met before the work starts.
Last reviewed: June 2026 by the BlueSafe Technical Team. Reflects current Australian WHS requirements.
This is one of the most common questions on Australian construction sites, and the answer is straightforward: yes, subcontractors generally need their own SWMS. The confusion usually comes from the fact that a site already has a principal contractor with its own documentation. That paperwork does not transfer the legal duty away from the subcontractor.
At a glance
| Question | Answer |
|---|---|
| Does a subcontractor PCBU need its own SWMS? | Yes, for HRCW the subcontractor carries out |
| Can it rely on the principal contractor's SWMS? | No |
| Who collects and reviews subcontractor SWMS documents? | The principal contractor |
| When must the SWMS be in place? | Before the HRCW starts |
| Does consultation between duty holders matter? | Yes — it is a legal requirement |
Why subcontractors must prepare their own SWMS
Under the model Work Health and Safety Regulations, a PCBU that is undertaking High Risk Construction Work must ensure a SWMS is prepared before that work begins. A subcontractor working under a head contractor is still a PCBU in its own right. Having another PCBU on site does not remove that obligation.
The requirement attaches to the entity doing the work, not to the site. A subcontractor knows its workers, their competencies, the specific way they will carry out the task, and the equipment they will use. That operational knowledge is exactly what a useful SWMS must capture. A document written by someone else cannot reliably reflect those specifics.
The SWMS must cover:
- the high-risk construction work activities the subcontractor's workers will carry out
- the hazards and risks associated with that work
- the control measures to eliminate or minimise those risks
- how and by whom those controls will be implemented and monitored
The principal contractor's role
A principal contractor has management or control of the construction site and carries its own distinct set of obligations. In relation to subcontractor SWMS documents, the principal contractor must:
- Request and collect each subcontractor SWMS before the HRCW starts
- Review the document to check it adequately identifies the hazards and sets out workable controls
- Keep the SWMS available on site for inspection
- Ensure the subcontractor is actually performing the work in accordance with the SWMS
This means simply filing the document is not enough. If the principal contractor becomes aware that work is not being performed in line with the SWMS, it has an obligation to act — including directing work to stop if necessary.
For more on the broader duties between parties in the contracting chain, see our guide to chain of responsibility for subcontractors.
Consultation and cooperation between duty holders
When two or more PCBUs share a workplace, they must consult, cooperate, and coordinate with each other so far as is reasonably practicable. On a construction site, this usually means:
- the principal contractor sharing its overall site safety management framework with subcontractors
- subcontractors raising any site-specific hazards they identify during their work
- both parties confirming that the subcontractor's SWMS does not conflict with the site-wide safety plan
- workers from different businesses being informed about relevant risks and controls before work starts
Consultation is not a sign-off formality. It is a mechanism for two-way information sharing so that every person on site understands what hazards exist and how they are being controlled.
What HRCW a subcontractor's SWMS needs to cover
Not all subcontractor work is High Risk Construction Work. The SWMS obligation applies where the subcontractor is actually carrying out one or more HRCW activities. Common examples include:
- working at heights greater than 2 metres (scaffolding, roofing, facade work)
- excavation or trenching deeper than 1.5 metres
- work involving asbestos
- work in confined spaces
- structural alterations with risk of collapse
- work on or near energised electrical installations
- work adjacent to traffic or on a road
A subcontractor carrying out work that spans more than one HRCW category may need a SWMS that addresses each relevant category, or separate documents for distinct scopes of work. For a full breakdown of who holds the duty to prepare a SWMS and when, see our guide on who prepares a SWMS.
What principal contractors typically require
On many Australian commercial and civil sites, the practical reality is that subcontractors are asked to submit their SWMS before they receive a site induction or before mobilisation is approved. Typical requirements include:
- a SWMS that clearly identifies the specific HRCW being performed
- the subcontractor's ABN and company name on the document
- the names or roles of workers covered by the SWMS
- a list of the plant and PPE to be used
- worker signatures confirming they have read and understood the document
- a review and re-sign process for any changes to scope or method
Some principal contractors also run their own pre-start checks or toolbox talks to confirm that the SWMS is understood before work begins for the day.
Common mistakes subcontractors make
The most frequent problems seen with subcontractor SWMS documents:
- Submitting a generic template that has not been updated to reflect the actual task, site, or equipment
- Copying the principal contractor's SWMS rather than preparing an independent document
- Failing to update the SWMS when the scope, method, or site conditions change
- Getting signatures without explanation — workers sign without having the content explained to them
- Omitting higher-order controls and listing only PPE
A SWMS that does not reflect how the work will actually be done is unlikely to protect workers and will not satisfy a regulator.
State and territory context
| Jurisdiction | Regulator | Key note |
|---|---|---|
| NSW | SafeWork NSW | Model WHS framework applies |
| VIC | WorkSafe Victoria | Victoria uses the OHS Act framework — different terminology and structure apply |
| 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 some 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 jurisdiction where the work is being carried out.
Related guides
Frequently asked questions
Do subcontractors need their own SWMS?
Yes. A subcontractor that is a PCBU and is carrying out High Risk Construction Work must prepare its own SWMS for that work. It cannot simply adopt or rely on the principal contractor's document.
Can a subcontractor use the principal contractor's SWMS?
No, not as a substitute. The principal contractor's SWMS documents the management of the site overall, but each PCBU carrying out HRCW must prepare its own document describing how its workers will perform that specific work.
What does the principal contractor do with subcontractor SWMS documents?
The principal contractor must collect the SWMS before the work starts, review it for adequacy, keep it on site, and ensure the subcontractor is actually following it.
What happens if a subcontractor does not have a SWMS?
The HRCW must not start until a SWMS is in place. Proceeding without one can expose the subcontractor and the principal contractor to regulatory action, improvement or prohibition notices, and potential prosecution under WHS laws.
SWMS documents for subcontractors
Blue Safe Online provides ready-to-use SWMS templates built for Australian WHS requirements. Each document is trade-ready and structured for easy tailoring to site conditions.
This article is general information only and does not constitute legal advice. WHS laws vary across Australian jurisdictions. Consult a qualified WHS professional or legal adviser for advice specific to your situation.