Subcontractor WHS Management: A Practical Guide for Construction Managers Without a Safety Team

Most construction managers running projects under 30 workers do not have a dedicated WHS management team. That does not change the legal obligation. Under the Work Health and Safety Act 2011, the duty to manage subcontractor WHS compliance sits squarely with the PCBU running the project, regardless of how many people are on the payroll or whether a full-time safety professional is present.

This guide covers exactly what subcontractor WHS management looks like in practice when the construction manager is doing the job themselves, or supported by an external WHS consultant one day per week.

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The Legal Position: You Cannot Contract Out Your WHS Duties

The most important thing to understand about subcontractor WHS management is that engaging a subcontractor does not transfer your WHS obligations to them.

Under Sections 14 and 272 of the WHS Act, WHS duties are non-transferable. A PCBU cannot contract out its duty of care to another party in the contractual chain. This applies regardless of what your subcontract agreement says.​

Key principles from the Safe Work Australia WHS Duties in a Contractual Chain Fact Sheet:

• WHS duties are not transferable between parties in a contractual chain
• WHS duties cannot be contracted out to a subcontractor
• A person can hold more than one duty simultaneously (a subcontractor is both a PCBU and a worker)
• There does not need to be a direct contractual relationship between a head contractor and a subcontractor’s worker for a duty of care to exist
• The more control a PCBU exercises over work, the greater the responsibility to discharge the shared WHS duty
• All PCBUs in the chain must consult, cooperate, and coordinate with each other on WHS matters
• Each subcontractor must manage risks arising from their own work so far as is reasonably practicable
• Every subcontractor must be aware of the WHS management plan and comply with site safety rules
• Head contractors must check subcontractor work procedures even where work is fully subcontracted
• Principal contractors on projects over $250,000 must obtain SWMS for all high-risk construction work before it begins

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What Triggers the Principal Contractor Role

The principal contractor role is triggered by the project value threshold, which varies by state:

State / Territory	Project Value Threshold
NSW	$250,000
QLD	$250,000
WA	6 people or more
VIC	$250,000
SA	$450,000
ACT	$250,000
TAS	$250,000
NT	$500,000

Below these thresholds, the principal contractor obligations under Part 6.4 of the WHS Regulations do not formally apply. However, the primary duty of care under Section 19 of the WHS Act applies to every PCBU at every project value. Subcontractor WHS management is not optional on a $150,000 project.​

For a full breakdown of principal contractor obligations by jurisdiction, see WHS Harmonisation in Australia on HSE Direct.

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The Five-Step Subcontractor WHS Management System for Small Construction Businesses

This is a lean, practical system that a construction manager can operate without a dedicated WHS officer. It covers prequalification, documentation, induction, monitoring, and review.

Step 1: Prequalification Before You Engage

Before any subcontractor sets foot on site, verify the following. Document the results and keep them on file.

Prequalification checklist for each subcontractor:

Requirement	What to Verify	Record
Public liability insurance	Minimum $10m, current certificate of currency	Copy of certificate
Workers compensation	Current policy or exemption letter	Copy of policy
WHS licences and tickets	White Card, high-risk work licences (HRWL) relevant to scope	Copy of licences
SWMS capability	SWMS for all high-risk construction work in their scope	Obtain before engagement
ABN and business registration	Confirms PCBU status, not sham contracting	ABN lookup
Previous WHS incidents	Ask directly, check ASIC / public records for prosecutions	Record responses

A subcontractor who cannot provide a current certificate of public liability insurance, workers compensation, and relevant HRWL tickets before mobilising is a compliance risk and a legal exposure. Do not start work.​

For prequalification templates, visit HSE Direct WHS Resources.

Step 2: SWMS Collection and Review

Under WHS Regulations Part 6.3, Division 2 (Regulations 299-302), a SWMS is required for every high-risk construction work (HRCW) activity. As the principal contractor or head PCBU, you must collect and review each subcontractor’s SWMS before that work begins.

High-risk construction work requiring a SWMS includes:

• Work at a height where a person could fall more than 2 metres
• Work in or near a confined space
• Work involving demolition
• Work near or involving live electrical services
• Work involving excavation deeper than 1.5 metres
• Work on or near pressurised gas distribution systems
• Work involving asbestos
• Work with structural alterations requiring temporary support

Reviewing a SWMS does not mean rubber-stamping it. The review must confirm the SWMS actually identifies the hazards specific to your site conditions, lists realistic controls (not generic statements), and is signed by the workers who will perform the work.

A common and legally costly mistake: subcontractors assuming the principal contractor’s SWMS covers their workers. It does not. Every PCBU must have their own SWMS for their own high-risk work.​

Step 3: Site Induction

Every subcontractor worker must be inducted into the site before starting work. The induction must cover site-specific information, not generic safety content.

Site induction must include as a minimum:

• Site emergency and evacuation procedures
• First aid locations and first aid officer contacts
• Site entry and exit rules
• Identified site hazards (overhead services, underground services, traffic, proximity hazards)
• Site rules: PPE requirements, speed limits, alcohol and drugs policy
• WHS management plan location and how to access it
• HSR contacts and process for raising WHS concerns
• Incident and near-miss reporting procedure
• Permit requirements (excavation, hot works, confined space, height work)

Keep a signed induction register. If a regulator arrives on site and a worker cannot demonstrate they were inducted, the exposure is yours.​

Step 4: Ongoing Site Monitoring

A signed SWMS and a completed induction do not constitute ongoing subcontractor WHS management. The WHS Act requires active, continuing oversight of work being performed.

For a construction manager without a dedicated safety team, minimum monitoring activity includes:

• Daily pre-start verification that SWMS controls are in place before high-risk work starts
• Visual site inspection at least once per shift covering housekeeping, PPE compliance, barricading, and plant exclusion zones
• Random SWMS field checks: cross-reference what workers are actually doing against what the SWMS says
• Immediate stop-work if a subcontractor is operating outside their SWMS or site rules
• Weekly toolbox talk covering current site-specific hazards (15 minutes, signed attendance)
• Permit review each morning for any excavation, hot works, confined space, or height work

The legal test under the WHS Act is “reasonably practicable.” On a project under 30 workers with low to medium risk work, the monitoring described above satisfies that test. On higher-risk work, more structured oversight is required.​

For guidance on when your project requires a dedicated WHS resource, see HSE Direct WHS Services.

Step 5: Non-Conformance and Stop-Work

When a subcontractor is found non-compliant, the response must be documented and proportionate.

Non-conformance response procedure:

1. Stop the specific activity immediately if it poses immediate risk
2. Discuss the non-conformance with the subcontractor supervisor directly
3. Record the finding on a site inspection form with date, time, subcontractor name, and description
4. Confirm corrective action and timeframe in writing (text message records are acceptable)
5. Re-inspect to confirm correction before resuming the activity
6. Escalate to SWMS revision if the non-conformance reflects a systemic issue in their method

Repeated non-conformance is grounds for terminating the subcontract. The WHS Act does not require you to continue engaging a subcontractor who will not meet their obligations. Document every step.​

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Documents You Must Have on Site

This is the minimum documentation set for a construction project under 30 workers managed without a full-time WHS team:

Document	Who Prepares It	Where Kept
WHS Management Plan	Head contractor / principal contractor	Site office, accessible to all workers
SWMS for each HRCW activity	Each relevant subcontractor	At the work face during the activity
Site induction register	Head contractor	Site office
Subcontractor prequalification register	Head contractor	Site office
Insurance and licence register	Head contractor	Site office
Daily pre-start checklist	Supervisor on site	Site file
Incident and near-miss register	Head contractor	Site office
Emergency response plan	Head contractor	Posted at site entry and amenities
Excavation and ground penetration permits	Permit Authority	At the work face

Projects above $250,000 must have a written WHS Management Plan before work starts under WHS Regulation 293. Projects below this threshold should still maintain a documented safety management framework. The absence of documentation is the most common aggravating factor in WHS prosecutions.​

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When One Day Per Week With a WHS Consultant Is the Right Model

For construction projects under 30 workers with a mix of low to medium risk work, a one-day-per-week external WHS consultant arrangement delivers structured compliance without the cost of a full-time hire.

What one day per week with HSE Direct delivers:

• Weekly site inspection with written report and photographic evidence
• SWMS review and sign-off for all active high-risk activities
• Subcontractor prequalification document checks
• Toolbox talk facilitation and attendance record
• Permit system audit
• Regulatory update advice as WHS Regulation 2025 (NSW) changes take effect
• Documented evidence of active due diligence that can be produced to a regulator

At $1,000 per day, 48 working weeks, the full annual cost is $48,000. Compare that to a fully loaded WHS Advisor at $228,000 per annum. For projects under 30 workers where HRCW is managed and low-risk activities dominate, the one-day model is appropriate and legally defensible. For the cost comparison in full detail, see HSE Direct WHS Cost Comparison.

For projects that escalate in risk profile, that arrangement scales up. The model is not fixed.

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Regulatory References

All subcontractor WHS management obligations derive from the following legislation and guidance:

• Work Health and Safety Act 2011 (Cth model law): Sections 14, 19, 27, 28, 272, Part 7
• WHS Regulation 2017 (NSW) / 2025 (NSW from 22 August 2025): Part 3.1 (regs 32-38), Part 6.3 Division 2 (regs 299-302), Part 6.3 Division 3 (regs 304-306), Part 6.4 (regs 309-312)
• SafeWork Australia: WHS Duties in a Contractual Chain
• Comcare: Contractor Management Guidance for PCBUs
• SafeWork NSW: Construction Work Code of Practice
• WorkSafe QLD: Managing Safety in the Workplace
• WorkSafe ACT: WHS Management Plans
• Safe Work Australia: Managing Risks

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This guide reflects WHS legislation as at March 2026. Regulatory thresholds and specific obligations vary by state. For subcontractor WHS management support, prequalification systems, SWMS review, or weekly site compliance services, contact HSE Direct.

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