Quick answer: Excavation contractors in Australia face some of the most serious WHS hazards in the construction industry — including trench collapse, underground service strikes, and mobile plant incidents. SWMS are required for all high risk construction work activities, and Dial Before You Dig obligations apply before any ground is disturbed. This page pulls together the essential resources, guides, and SWMS templates that excavation contractors need.
Last reviewed: 12 June 2026
Excavation and earthworks are among the highest-risk activities in Australian construction. Trench collapses, underground service strikes, and mobile plant incidents can each cause death or catastrophic injury — and in many cases, the hazards develop quickly and without obvious warning. Australian WHS legislation imposes significant duties on excavation contractors, and regulators actively enforce compliance on excavation sites.
This page is a practical resource hub for excavation contractors and earthworks businesses. It links to guides, checklists, SWMS templates, and WHS document resources relevant to excavation, trenching, and earthworks in Australia. Use it as a starting point to understand your obligations and find the tools you need.
Note: WHS laws in Australia are based on the model Work Health and Safety Act 2011, but each state and territory has its own legislation and regulator. Always check the requirements that apply in your jurisdiction.
WHS obligations for excavation contractors
Duty as a PCBU
Any excavation contractor carrying on a business — sole trader, partnership, or company — is a person conducting a business or undertaking (PCBU) under Australian WHS legislation. As a PCBU, an excavation contractor must ensure the health and safety of:
- their own workers (employees and labour hire)
- subcontractors and their workers
- other people on or near the workplace, including members of the public adjacent to the excavation
The PCBU duty is to eliminate risks so far as is reasonably practicable, or if that is not possible, to minimise them so far as is reasonably practicable. Given the severity of excavation hazards, a high standard of control is expected.
High risk construction work in excavation
Excavation work is almost always high risk construction work (HRCW) under the WHS Regulations. The categories most commonly triggered by excavation and trenching include:
- Work involving a risk of a person falling more than 1.5 metres — applies to any trench or excavation deeper than 1.5 metres
- Work near or involving the disturbance of underground services — applies to any excavation in areas where services may be present
- Work involving the operation of mobile plant — excavators, skid steer loaders, tip trucks, and other earthmoving equipment
- Work in or near a confined space — trenches and excavations can become confined spaces depending on depth and conditions
- Work on or near traffic corridors — roadworks and kerb and channel work
- Work in areas with unstable ground — relevant to deep excavations and sites with poor soil conditions
Each triggered category requires its own SWMS. In practice, most excavation jobs will require multiple SWMS to cover all the HRCW activities involved.
Dial Before You Dig — a critical obligation
Before any ground is disturbed, excavation contractors must take all reasonably practicable steps to identify underground services in the work area. Striking a buried gas line, high-voltage electrical cable, or water main can cause death, serious injury, and significant property damage.
Dial Before You Dig (DBYD) is the national referral service that provides plans for underground infrastructure. Lodging a request with DBYD — via 1100 or dialbeforeyoudig.com.au — is the standard first step before any excavation commences.
Key steps for underground service management:
- Lodge a DBYD request at least 2 business days before work commences
- Review the plans received and mark out the location of identified services on the ground
- Establish exclusion zones around services — in most cases, hand digging or vacuum excavation is required within 300–500mm of a marked service
- Where service locations cannot be confirmed with confidence, use non-destructive digging methods (vacuum excavation or careful hand digging) before committing plant
- Do not assume a clear DBYD result means no services are present — plans may be incomplete or inaccurate
- Record DBYD enquiry numbers and plans as part of the job file
The consequences of failing to locate services before excavating are severe — both for the people involved and for the contractor. DBYD obligations exist regardless of job size, duration, or whether the contractor is working for a principal contractor or directly for a client.
For detailed guidance, see the Underground Services SWMS Guide.
Trench and excavation safety
Trench collapse
Trench collapse is one of the leading causes of death in the Australian construction industry. A cubic metre of soil weighs approximately 1.5 tonnes — even a shallow collapse can cause fatal crush injuries before rescue is possible. Controls for trench collapse include:
- Benching or battering the sides of the trench to a stable angle
- Installing trench shoring or shielding (e.g. Trench Boxes) for deeper excavations
- Keeping excavated spoil clear of the trench edge (minimum 600mm setback)
- Prohibiting workers from entering an unshored trench deeper than 1.5 metres without appropriate controls in place
- Monitoring the excavation for signs of ground movement, cracking, or water ingress
Access and egress
Workers must be able to enter and exit an excavation safely. Requirements include:
- Ladders or steps at appropriate intervals for excavations workers enter
- Ladders secured at the top and extending at least 1 metre above the trench edge
- No workers jumping in or out of trenches
Exclusion zones and plant management
Excavators and other mobile plant operating near open trenches create additional hazards — plant movement can destabilise trench walls or strike workers. Controls include:
- Spotters where plant is working near open excavations or in restricted areas
- Clear exclusion zones around the excavation perimeter for unauthorised personnel
- No plant operating in proximity to an unsupported trench edge without assessment
Common SWMS for excavation contractors
The table below lists the SWMS most commonly needed on excavation and earthworks sites.
| SWMS | When needed |
|---|---|
| Excavation and Trenching SWMS | Trenching and excavation work, particularly for any trench deeper than 1.5 metres |
| Location of Underground Services SWMS | Any excavation work in areas where underground services may be present |
| Excavator SWMS | Operation of excavators on site — HRCW mobile plant category |
| Mobile Plant SWMS | Operation of earthmoving plant generally, including on civil and earthworks sites |
| Skid Steer Loader SWMS | Operation of skid steer loaders for bulk earthworks, material handling, and site preparation |
| Traffic Control SWMS | Excavation work on or near roads, footpaths, or traffic corridors |
| Earthmoving Plant Maintenance and Service SWMS | Servicing, maintenance, and repairs to earthmoving plant on site or in the field |
WHS documents an excavation contractor needs
Beyond SWMS, excavation contractors need a broader set of WHS documents to demonstrate a compliant and well-managed business. The table below outlines the core documents, their purpose, and when they are required.
| Document | Purpose | When required |
|---|---|---|
| WHS Policy | Demonstrates leadership commitment to health and safety; sets out responsibilities | Any business with workers; broadly expected by principal contractors and clients |
| SWMS | Identifies HRCW activities, hazards, and risk controls | Before commencing any HRCW activity; kept on site throughout |
| DBYD Records | Documents that underground service enquiries were lodged and plans reviewed before excavation | Before any ground disturbance; retained as part of the job file |
| Site Induction Records | Evidence that workers have received site-specific safety information | Before any person accesses the site; ongoing throughout the job |
| Hazard / Risk Register | Documents identified hazards, risk ratings, and controls | Maintained throughout the project; updated as new hazards are identified |
| Incident Register | Records incidents, near misses, dangerous occurrences, and work-related injuries | Ongoing; notifiable incidents must be reported to the regulator |
| Plant and Equipment Register | Tracks plant on site, inspection status, operator licences, and maintenance records | Maintained while plant is in use; pre-start inspection records updated daily |
| Training and Competency Register | Records qualifications, licences, tickets, and training for each worker | Ongoing; HRW licences required before workers operate licensed plant |
| Subcontractor Register | Documents subcontractors engaged, their insurances, and WHS compliance | Maintained for all subcontractors engaged on the project |
| Emergency Plan | Sets out emergency response procedures including contact numbers and rescue procedures for trench emergencies | Required for all workplaces; site-specific to each job |
| Toolbox Talk Records | Documents safety briefings conducted with workers | Ongoing; records date, topic, presenter, and attendees |
For a detailed guide on all the WHS documents an excavation contractor needs, see WHS Documents for Excavation Contractors.
Pre-start checklist for excavation jobs
The following checklist covers the key WHS steps that should be completed before excavation work commences on any site.
Before work commences:
- DBYD enquiry lodged and plans received; services marked out on the ground
- SWMS prepared for all HRCW activities (excavation/trenching, underground services, mobile plant, traffic control as applicable)
- SWMS reviewed with all workers who will perform the work; sign-off obtained
- Exclusion zones established around the excavation area
- Trench shoring, shielding, or battering plan confirmed for trenches deeper than 1.5 metres
- Emergency procedures documented and communicated — including trench rescue contacts
- Plant and equipment pre-start inspections completed; defects recorded and resolved
- Operator licences checked for all plant operators (HRW licence where required)
- Traffic management plan in place where work is on or near traffic (traffic control SWMS current)
- Site induction completed for all workers
Ongoing throughout the job:
- Ground conditions monitored throughout the day; any cracking, movement, or water ingress triggers a stop-work review
- DBYD plans available on site; service marking refreshed as work progresses
- Plant pre-start inspections completed each day before use
- Spoil kept clear of trench edge (minimum 600mm setback)
- No workers in unsupported excavations deeper than 1.5 metres
- Incident register maintained; notifiable incidents reported promptly
- SWMS reviewed and updated if work methods or site conditions change
For a comprehensive safety checklist specific to excavation work, see the Excavation Safety Checklist.
Mobile plant safety on excavation sites
Excavation contractors routinely operate excavators, skid steer loaders, tip trucks, and other mobile plant. Mobile plant is a significant source of fatalities and serious injuries on Australian construction sites — most commonly through workers being struck by moving plant or plant overturning.
Key controls for mobile plant on excavation sites:
- Exclusion zones: Establish and maintain exclusion zones around operating plant. No person on foot should be within the swing radius of an excavator unless the plant is stopped and the operator is aware of their presence.
- Spotters: Where exclusion zones cannot be maintained — such as in restricted urban sites — a dedicated spotter must be used to manage interaction between plant and personnel.
- Pre-start inspections: All plant must be inspected before use each day. Defects must be recorded and resolved before the plant is operated.
- Operator competency: Only licenced and competent operators are to operate plant requiring a HRW licence. Competency must be assessed for each class of plant, not assumed from a licence alone.
- Tip-over prevention: Excavators and skid steers working near open trenches or on sloped ground must be assessed for tip-over risk; outriggers must be deployed where fitted.
For guidance on selecting the right SWMS for mobile plant activities, see the Mobile Plant SWMS Guide.
Useful guides for excavation contractors
The following guides cover the WHS topics most relevant to excavation and earthworks businesses.
- Excavation and Trenching SWMS Guide — When a SWMS is required for excavation and trenching work, and what it must cover
- Underground Services SWMS Guide — SWMS and DBYD obligations for working near buried services
- Mobile Plant SWMS Guide — SWMS requirements for excavators, skid steers, and other earthmoving plant
- WHS Documents for Excavation Contractors — Full guide to WHS documents for excavation and earthworks businesses
- Excavation Safety Checklist — Pre-start and ongoing safety checklist for excavation sites
SWMS templates for excavation contractors
Blue Safe Online provides SWMS templates for the excavation and earthworks activities most commonly needed on civil and construction sites. Templates are professionally prepared, editable, and ready to customise to your specific site conditions and work methods.
Browse the full range of excavation and earthworks SWMS at Blue Safe Online.
Frequently asked questions
Do excavation contractors need a SWMS?
Yes. Excavation and trenching work triggers multiple categories of high risk construction work (HRCW) under the WHS Regulations. A SWMS is required before commencing any HRCW activity, including excavations deeper than 1.5 metres, work near underground services, and the operation of mobile plant such as excavators and skid steer loaders. The SWMS must identify the specific hazards, set out the controls to be applied, be reviewed with workers before work commences, and be kept accessible on site throughout the activity.
What are the underground services obligations for excavation contractors?
Before commencing any excavation work, a PCBU must take all reasonably practicable steps to identify underground services in the work area. This includes lodging a request with Dial Before You Dig (1100 or dialbeforeyoudig.com.au) to obtain plans for gas, electrical, water, sewer, communications, and other buried infrastructure. Plans must be obtained, reviewed, and used to mark out services before any ground disturbance. Where services cannot be confirmed as clear, careful hand digging or vacuum excavation must be used within the exclusion zone. Striking an underground service — particularly gas or high-voltage electrical — can cause death. These obligations apply regardless of the size or duration of the excavation.
What licences does an excavator operator need in Australia?
In most Australian states and territories, operators of excavators above a certain capacity are required to hold a High Risk Work (HRW) licence for the relevant plant category. Requirements vary by jurisdiction and plant size — for example, in some states a licence is required to operate an excavator above 10 tonnes. Operators should check the specific requirements for their state or territory with the relevant WHS regulator. In addition to licensing, operators should be assessed as competent for the specific machine and site conditions they are working in. Licence records must be kept in the employer's training and competency register.
When is a trench considered high risk construction work?
Under the WHS Regulations, excavation work is classified as high risk construction work (HRCW) when it involves a risk of a person falling more than 1.5 metres — which includes any trench or excavation deeper than 1.5 metres. This triggers the requirement for a SWMS before work commences. In practice, most trenching for utilities, drainage, or foundations will quickly reach this depth. Additionally, any excavation work near underground services, whether or not the excavation is deeper than 1.5 metres, should be treated with the same rigour given the potentially fatal consequences of striking a live service.
Get your WHS documents sorted
Blue Safe Online provides SWMS templates and WHS management systems for Australian excavation contractors. Whether you are setting up your business for the first time, preparing for a civil construction project, or updating outdated documents, Blue Safe Online gives you access to professionally prepared, ready-to-customise WHS documents for the excavation and earthworks industry.
Browse SWMS and WHS documents for excavation contractors on Blue Safe Online
This page provides general information only and does not constitute legal advice. WHS requirements may vary by state or territory, project type, contract conditions, and your role on site. Consult the relevant WHS regulator or a qualified WHS professional for advice specific to your circumstances.