Quick answer: Managing subcontractor WHS documents means collecting the right documents before mobilisation, reviewing them for adequacy, maintaining a register with expiry dates, verifying compliance on site, and keeping records for the required retention period.
Last reviewed: June 2026 by the BlueSafe Technical Team. Reflects current Australian WHS laws and regulations.
Most WHS failures involving subcontractors do not happen because a principal contractor had no documents. They happen because the documents collected were inadequate, expired, or never checked against what was actually happening on site. Managing subcontractor WHS documents properly means treating document collection as a system, not a one-time tick-box.
This guide covers the practical process from first contact through to record retention. For a broader introduction to your legal duties when engaging contractors, see What is Contractor WHS Management?.
Step 1: Decide what documents to collect before mobilisation
Before any subcontractor starts work, you need to establish what documents are required for their specific scope. The documents you need depend on the work being done, not just the fact that a subcontractor is involved.
Documents required for most subcontractors:
- SWMS — required for all high-risk construction work (HRCW) as defined in the WHS Regulations. The SWMS must be specific to the work and site, not a generic form.
- Public liability insurance — certificate of currency, typically $10–$20 million cover, depending on your contract requirements.
- Workers compensation insurance — certificate of currency for any subcontractor with employees. If the subcontractor is a sole trader with no workers, confirm this in writing.
- Trade licences or high-risk work licences — for electrical, plumbing, gas, rigging, scaffolding, crane operation, and other licenced work.
- WHS policy — evidence that the subcontractor has a stated commitment to health and safety.
Additional documents depending on scope:
- Plant registration certificates and maintenance records if the subcontractor is bringing plant to site.
- Certificates of competency for operators.
- Safe work procedures for non-HRCW tasks that carry significant risk.
- Environmental licences where relevant.
- Evidence of industry inductions (e.g., white card for construction, site-specific induction records).
Use a standardised pre-mobilisation checklist so that no document category is missed. The Subcontractor Onboarding Checklist provides a ready-to-use format for this step.
Step 2: Review SWMS for adequacy — not just existence
Receiving a SWMS is not the same as having an adequate SWMS. A principal contractor who collects an obviously inadequate SWMS and does nothing about it is in a weak position if something goes wrong.
What makes a SWMS adequate?
The Model WHS Regulations require that a SWMS for HRCW must:
- identify the work that is HRCW;
- identify the hazards and assess the risks arising from the work;
- describe the control measures to be implemented; and
- describe how the control measures will be implemented, monitored, and reviewed.
Red flags to look for when reviewing a SWMS:
| Issue | Why it matters |
|---|---|
| No mention of the specific site or project | Generic SWMS do not account for site-specific hazards — they may be entirely unsuitable for the actual conditions |
| Control measures listed are not in hierarchy of controls order | Suggests the person who wrote it does not understand risk management |
| Administrative controls listed where engineering controls were practicable | May indicate a less-than-adequate approach to risk reduction |
| The SWMS is undated or signed by someone not involved in the work | Cannot verify it was prepared before work commenced |
| High-risk work described in vague terms | Insufficient for supervisors or workers to actually follow |
When you identify deficiencies, return the SWMS to the subcontractor with written feedback specifying what needs to be corrected. Keep a record of that exchange. Do not allow the work to commence until a satisfactory SWMS is in place.
Step 3: Set up and maintain a subcontractor register
A subcontractor register is the master record of who you have engaged, what work they are doing, what documents you hold, and when those documents expire. Without a register, document management becomes reliant on individual memory and is almost certain to fail over time.
Your register should record, at minimum:
- Subcontractor name and ABN.
- Contact details for the WHS representative or responsible person.
- Scope of work.
- Site or project.
- Start date and expected end date.
- Public liability insurance policy number, insurer, and expiry date.
- Workers compensation certificate expiry date.
- Licence type and expiry date for each relevant licence.
- SWMS reference and the date it was reviewed and accepted.
- Date of site induction.
- Date of last document review.
- Any outstanding document requests or conditions.
The register should be reviewed at least monthly during active engagements. It must be updated whenever a subcontractor's scope changes or when new workers from the same subcontractor are mobilised.
Step 4: Track insurance and licence expiries
Insurance and licences that expire mid-project are one of the most common document failures in contractor management. A certificate of currency collected at mobilisation may expire three months into a six-month project.
Set up an expiry tracking process:
- When you first receive a document, record the expiry date in your register.
- Set a reminder 30 days before expiry to request a renewal certificate.
- Send the renewal request to the subcontractor in writing — email is sufficient.
- If the renewal is not received before expiry, the subcontractor must not continue work until the renewed certificate is provided and recorded.
Do not accept screenshots of renewal confirmations as a substitute for a new certificate of currency. The certificate itself is the evidence.
For licences, verify the licence number against the relevant state or territory licencing authority register where possible. Most jurisdictions provide free online licence lookup tools. This step confirms that the licence is current and was not issued to a different person.
Step 5: Conduct on-site verification
Documents collected at the office are only the starting point. On-site verification closes the gap between what documents say and what is actually happening.
What to check on site:
- Is the work being performed in accordance with the SWMS? If workers are not following the documented control measures, the SWMS is not being used as intended and you may need to stop the work and direct the subcontractor to review their process.
- Are the workers on site the same as those named or described in the SWMS? If new workers have been added, confirm they have been inducted and are familiar with the SWMS.
- Is the licenced work being done by the licenced person? Confirm by sight — ask to see the licence card if required.
- Is any plant on site covered by the registration and maintenance records already provided?
Record your on-site observations. A brief signed site inspection record noting what was checked and what was found is sufficient. These records become important evidence of active supervision if a WHS investigation later occurs.
If you find that a subcontractor is not complying with their SWMS or the site WHS requirements, issue a written direction to stop or correct the work and follow up to confirm the issue has been resolved.
Step 6: Manage document updates when scope or conditions change
Subcontractor documents are not set-and-forget. A SWMS prepared for initial excavation work is not automatically adequate for the formwork that follows. When the scope, location, or conditions of work change, the documents must be updated.
Triggers for requiring updated documents:
- A new type of HRCW is added to the subcontractor's scope.
- Work moves to a different area of the site where conditions differ.
- An incident or near-miss occurs involving the subcontractor.
- The subcontractor's nominated WHS contact or responsible person changes.
- A risk assessment identifies that the existing SWMS controls are not working.
- An insurance or licence renewal occurs.
Each update should be processed through the same collection and review steps as the initial mobilisation. Record the update in your register.
Step 7: Retain records for the required period
Records that are not retained cannot be used to demonstrate compliance after the fact. WHS record retention is a legal obligation, not just good practice.
General guidance on retention periods:
| Document type | Minimum retention guidance |
|---|---|
| SWMS for HRCW | Duration of the project, plus the period specified by your jurisdiction (check with your state or territory regulator) |
| Insurance certificates | Until the limitation period for claims arising from the work has passed — a minimum of seven years is a practical standard |
| Licence copies | Duration of the engagement and at least five years after |
| Subcontractor register | At least seven years after the engagement ends |
| Site inspection and verification records | At least seven years |
| Incident records | At least seven years, or as required by your jurisdiction for notifiable incidents |
Store records in a way that allows you to locate a specific subcontractor's file and produce it promptly. Physical files are acceptable, but a cloud-based document management system significantly reduces the risk of loss and makes expiry tracking easier.
Putting it together: a repeatable process
The steps above work best when they are embedded in a repeatable process — one that any project manager or site supervisor can follow consistently, regardless of who is managing a particular subcontractor.
A practical checklist at each stage looks like this:
Before mobilisation: collect all required documents, review the SWMS for adequacy, enter all details and expiry dates into the register, confirm site induction is scheduled.
During the project: monitor expiry dates monthly, conduct on-site SWMS compliance checks, issue written directions for any non-compliance, update documents when scope or conditions change.
At project completion: conduct a final document audit, file all records, archive the subcontractor register entry with retention date noted.
The Subcontractor Onboarding Checklist supports the pre-mobilisation stage. Blue Safe Online provides the register, expiry tracking, and document storage tools to manage the rest of the process in one place.
Related guides
Frequently asked questions
What documents should I collect from a subcontractor before they start work?
At a minimum, collect a current SWMS for each HRCW task, a public liability certificate of currency, a workers compensation certificate of currency, copies of relevant licences, and the subcontractor's WHS policy. Depending on the scope, you may also need plant registration certificates and safe work procedures.
How do I know if a subcontractor's SWMS is adequate?
An adequate SWMS identifies the HRCW, lists site-specific hazards and risks, describes controls in hierarchy of controls order, and was prepared before work commenced. Generic forms with no site-specific detail, missing controls, or controls that cannot be implemented as written are not adequate.
How long do I need to keep subcontractor WHS documents?
Keep SWMS for the project duration and any post-completion period required by your jurisdiction. Maintain insurance certificates, licences, and the subcontractor register for at least seven years. Check with your state or territory regulator for jurisdiction-specific requirements.
Do I need to verify a subcontractor's documents on site, not just at the office?
Yes. On-site verification confirms that workers are following the SWMS, that licenced workers are performing licenced work, and that the controls described in the documents are actually in place. Office-only document collection without on-site verification provides limited due diligence value.
Manage subcontractor documents in one place
Tracking multiple subcontractors, expiry dates, SWMS reviews, and site inspections across spreadsheets and shared drives is difficult to sustain. Blue Safe Online gives you a structured register, automatic expiry alerts, and document storage designed for Australian WHS compliance.
Get started with Blue Safe Online
This article is general information only. It does not constitute legal advice. WHS laws and regulatory requirements vary by state and territory. Consult your state or territory WHS regulator or a qualified WHS professional for advice specific to your circumstances.