Introduction
Construction remains one of the most hazardous industries in Australia: Safe Work Australia (2023) consistently places the sector among the three industries with the most traumatic worker fatalities, with falls from a height, being struck by moving plant and contact with electricity the leading mechanisms. Systematic risk management is therefore a core function of construction project management rather than a compliance formality (Lingard & Wakefield 2019). This assignment undertakes a work health and safety (WHS) risk assessment for the structure phase of a hypothetical six-storey development in Brunswick, in Melbourne’s inner north, applying the four-step process of the model code of practice How to manage work health and safety risks (Safe Work Australia 2018a). It identifies six hazards, scores them with a 5×5 risk matrix, proposes a prioritised control plan structured by the hierarchy of controls, and explains the consultation, safe work method statement (SWMS) and monitoring obligations attaching to the works.
Legislative and Regulatory Framework
The national framework is the model Work Health and Safety Act 2011 (Cth) and the model Work Health and Safety Regulations 2011 (Cth), developed by Safe Work Australia and adopted in most jurisdictions. Section 19 places the primary duty on a person conducting a business or undertaking (PCBU) to ensure, so far as is reasonably practicable, the health and safety of workers and others affected by the work. Section 18 defines reasonably practicable by weighing the likelihood and degree of harm, what the duty holder knows or ought to know about the hazard, the availability and suitability of controls and, last of all, cost. The Regulations add construction-specific machinery: projects valued at $250,000 or more require a principal contractor and a WHS management plan, and a SWMS is mandatory for every class of high-risk construction work (Safe Work Australia 2018b). Approved codes of practice are admissible in proceedings as evidence of what is known about a hazard and what is reasonably practicable.
One jurisdictional nuance matters for a Melbourne site: Victoria has not adopted the model laws and operates under the Occupational Health and Safety Act 2004 (Vic), administered by WorkSafe Victoria, whose employer duty (s 21), consultation duty (s 35) and compliance codes closely parallel the model provisions. Consistent with the unit brief, this assessment applies the model framework, noting Victorian equivalents where material (WorkSafe Victoria 2018).
Site Scenario
The project is a six-storey mixed-use building comprising a retail podium and 38 apartments on a corner site fronting Sydney Road, Brunswick. The principal contractor, MBC Constructions Pty Ltd, is the PCBU with management and control of the workplace. The site is midway through its structure phase: formwork decks are cycled floor by floor, concrete is placed by boom pump, and a tower crane services the decks while a 60-tonne mobile crane handles street-side deliveries twice a week. Approximately 48 workers from nine subcontractors attend at peak; inner-Melbourne constraints sharpen the risk profile. A live pedestrian footpath passes beneath a gantry hoarding on the Sydney Road frontage, trams run within metres of the boundary beneath overhead traction wires, low-voltage mains follow the side street used for deliveries, and concrete and masonry are cut and ground on site. These conditions frame the hazard identification in Table 1.
Step 1: Hazard Identification
Hazards were identified using the methods recommended in the code (Safe Work Australia 2018a): a structured walk-through inspection, review of incident and hazard registers, examination of safety data sheets, task analysis of upcoming high-risk work, and consultation with supervisors and elected health and safety representatives (HSRs). Consultation is an identification method in its own right: workers routinely surface hazards that inspections miss, and worker involvement is empirically linked to stronger safety performance on complex projects (Trinh & Feng 2020). Six hazards were prioritised for detailed assessment, as shown in Table 1.
Table 1: Identified hazards, persons at risk and existing controls (structure phase)
| Ref | Hazard | Persons at risk | Existing controls |
|---|---|---|---|
| H1 | Falls from a height: unprotected slab edges and penetrations during formwork cycling and steel fixing | Formworkers, steel fixers, concreters | Guardrails to Level 3 only; several penetrations uncovered; harnesses available but anchorage points not documented |
| H2 | Crane operations: suspended loads travelling over work areas and the Sydney Road footpath | All site workers; pedestrians on the footpath | Licensed crane crew and dogman; daily pre-start checks; no documented lift plans for non-routine lifts |
| H3 | Respirable crystalline silica from on-site cutting and grinding of concrete and masonry | Concreters, bricklayers, nearby labourers | Dry cutting observed; disposable P2 respirators; no on-tool extraction or water suppression |
| H4 | Mobile plant and vehicles: telehandler, concrete trucks and delivery vehicles sharing ground-floor routes with workers on foot | Ground-floor workers, traffic controllers, drivers | High-visibility clothing; reversing alarms; informal traffic management arrangements only |
| H5 | Work near overhead electrical assets: crane and boom pump slewing near low-voltage mains and tram traction wires | Crane and pump operators, dogmen, the public | Verbal instruction to maintain clearance; no marked exclusion zone; no spotter allocated |
| H6 | Hazardous manual handling of formwork components, reinforcement and props | Formworkers, steel fixers, labourers | Team lifting encouraged; no mechanical aids on the upper decks |
Step 2: Risk Assessment
Each hazard was assessed with a semi-quantitative 5×5 matrix: a likelihood rating (L1 Rare to L5 Almost certain) is multiplied by a consequence rating (C1 Insignificant to C5 Catastrophic) to give a risk score from 1 to 25, as presented in Table 2. Scores are an ordering device rather than a precise measurement; organisational arrangements ultimately determine whether the controls behind any score operate in practice (Hopkins 2019).
Table 2: 5×5 risk matrix (risk score = likelihood x consequence)
| Likelihood | C1 Insignificant | C2 Minor | C3 Moderate | C4 Major | C5 Catastrophic |
|---|---|---|---|---|---|
| L5 Almost certain | 5 (M) | 10 (H) | 15 (H) | 20 (E) | 25 (E) |
| L4 Likely | 4 (L) | 8 (M) | 12 (H) | 16 (H) | 20 (E) |
| L3 Possible | 3 (L) | 6 (M) | 9 (M) | 12 (H) | 15 (H) |
| L2 Unlikely | 2 (L) | 4 (L) | 6 (M) | 8 (M) | 10 (H) |
| L1 Rare | 1 (L) | 2 (L) | 3 (L) | 4 (L) | 5 (M) |
Bands: L = Low (1-4), M = Medium (5-9), H = High (10-16), E = Extreme (17-25).
Applying the matrix to Table 1, with existing controls taken into account, yields the scores below; the method is shown in full for the two highest-rated hazards. For H1, unprotected edges and uncovered penetrations observed on two live decks support L4, and the probably fatal outcome of a fall from the upper decks supports C5: Risk = L4 x C5 = 20, Extreme. For H3, daily dry cutting supports L4 and the irreversible course of silicosis supports C4: Risk = L4 x C4 = 16, High.
- H1 Falls from a height: L4 x C5 = 20 (Extreme)
- H3 Respirable crystalline silica: L4 x C4 = 16 (High)
- H2 Crane operations: L3 x C5 = 15 (High)
- H4 Mobile plant and pedestrians: L3 x C4 = 12 (High)
- H5 Overhead electrical assets: L2 x C5 = 10 (High)
- H6 Manual handling: L4 x C2 = 8 (Medium)
The Extreme rating for H1 means the affected work must not proceed until further controls are in place; falls remain the leading cause of construction fatalities nationally (Safe Work Australia 2023). The High rating for H3 reflects an occupational lung disease Australian respiratory physicians describe as rapidly re-emerging (Hoy et al. 2018), and the national prohibition on working with engineered stone from 1 July 2024 underlines the regulatory trajectory for silica generally.
Step 3: Risk Control
Regulation 36 of the model WHS Regulations obliges duty holders to work through the hierarchy of controls in descending order, adopting the highest-order controls that are reasonably practicable and combining them where one measure is insufficient. Figure 1 illustrates the hierarchy. Elimination removes the hazard entirely and is the most reliable response. Substitution, isolation and engineering controls (Level 2) reduce risk through physical means that do not depend on behaviour. Administrative controls and personal protective equipment (Level 3) depend on sustained compliance and may only supplement, never replace, higher-order controls (Safe Work Australia 2018a).
Table 3 sets out the prioritised control plan with residual risk re-scores, with controls pushed as high up the hierarchy as reasonably practicable. For falls, the plan follows the model falls code and the Victorian compliance code in preferring passive engineering controls, continuous perimeter protection and covered penetrations, over harness-based systems reserved for short-duration anomaly tasks (Safe Work Australia 2018c; WorkSafe Victoria 2018). For silica, cutting is substituted off site where possible, residual cutting is wet-suppressed with on-tool extraction, and fit-tested respirators remain a final barrier while air monitoring verifies exposures against the workplace exposure standard prescribed under the model Regulations.
Table 3: Prioritised control plan with residual risk re-scores
| Priority | Hazard | Additional controls (hierarchy level) | Initial risk | Residual risk |
|---|---|---|---|---|
| 1 | H1 Falls from a height | Continuous perimeter screens and guardrails on all live decks; fixed mesh covers over penetrations; permit system for edge work; harnesses restricted to short-duration anomaly tasks (isolation, engineering, administrative) | L4 x C5 = 20 (Extreme) | L1 x C5 = 5 (Medium) |
| 2 | H3 Respirable crystalline silica | Substitute off-site precut elements; on-tool water suppression and H-class extraction for residual cutting; fit-tested respirators; quarterly air monitoring (substitution, engineering, PPE) | L4 x C4 = 16 (High) | L1 x C4 = 4 (Low) |
| 3 | H2 Crane operations | Documented lift plans; exclusion zones beneath load paths; street-side lifts scheduled with footpath closure permits outside pedestrian peaks; no loads over occupied public areas (isolation, administrative) | L3 x C5 = 15 (High) | L1 x C5 = 5 (Medium) |
| 4 | H4 Mobile plant and pedestrians | Barricaded pedestrian corridors and separate access gates; proximity warning devices on the telehandler; accredited traffic controllers under a documented traffic management plan (isolation, engineering, administrative) | L3 x C4 = 12 (High) | L2 x C4 = 8 (Medium) |
| 5 | H5 Overhead electrical assets | No Go Zones marked with physical delineation per Victorian requirements; crane slew limiters programmed; dedicated spotter for lifts near the Sydney Road boundary (engineering, administrative) | L2 x C5 = 10 (High) | L1 x C5 = 5 (Medium) |
| 6 | H6 Manual handling | Crane-delivered material packs sequenced to the point of use; trolleys and prop carriers on decks; task rotation for repetitive lifts (engineering, administrative) | L4 x C2 = 8 (Medium) | L2 x C2 = 4 (Low) |
The pattern of the residual scores is deliberate. For the high-energy hazards, falls, cranage and electricity, controls chiefly reduce likelihood while the consequence of a realised event remains catastrophic, so residual ratings settle at Medium (for example, H1: L1 x C5 = 5) rather than Low. The arithmetic signals that these controls must be maintained and verified continuously, not that the hazards have been neutralised.
Consultation and SWMS Obligations
The model Act imposes two consultation duties. Under s 46, MBC Constructions must consult, cooperate and coordinate with every other duty holder at the workplace, here the nine subcontractors, the crane contractor and the concrete supplier, so that controls interlock rather than conflict. Under ss 47-49, it must consult workers who are, or are likely to be, directly affected: sharing information in a timely way, giving them a genuine opportunity to express views, involving HSRs and advising outcomes. On this site those duties are operationalised through daily pre-start briefings, weekly toolbox talks keyed to upcoming high-risk work, HSR participation in inspections, and a fortnightly site WHS committee. The Victorian consultation duty in s 35 of the Occupational Health and Safety Act 2004 (Vic) is materially the same.
Several activities in the scenario are high-risk construction work under the model Regulations, including work with a risk of a person falling more than two metres, work near energised electrical installations or services, work adjacent to a road in use, and the use of powered mobile plant. A SWMS must be prepared before each such activity commences, in consultation with the workers performing it, and must identify the work, its hazards, the controls, and how the controls will be implemented, monitored and reviewed (Safe Work Australia 2018b). Work that departs from its SWMS must stop until the statement is followed or revised. Because the project value far exceeds the $250,000 threshold, MBC Constructions must also maintain a WHS management plan covering roles, consultation arrangements, incident procedures and site rules.
Step 4: Monitoring and Review
Under reg 38 of the model Regulations, controls must be reviewed and revised when a control fails, before a change that may create new risks, when a new hazard or information emerges, when consultation indicates a review is needed, or when an HSR requests one. On this site the review machinery comprises daily plant pre-start inspections, weekly documented inspections scored against each active SWMS, monthly review of the risk register by the site WHS committee, quarterly occupational hygiene monitoring of silica with health monitoring for exposed workers, and reassessment of Table 3 after any incident or scope change. Lead indicators, such as the proportion of verified controls, corrective action close-out times and consultation attendance, are tracked alongside lag indicators because injury frequency alone is a delayed and unreliable signal (Hopkins 2019). Notifiable incidents must be reported to WorkSafe Victoria immediately, with the scene preserved until an inspector directs otherwise. The residual ratings in Table 3 hold only while the controls that produced them remain effective; verification, not documentation, sustains them.
Conclusion
This assessment applied the model WHS framework to a realistic inner-Melbourne construction scenario. Six hazards were identified through inspection and consultation; matrix scoring rated falls from a height Extreme (L4 x C5 = 20) and four further hazards High; and a prioritised control plan reduced every hazard to Medium or Low by preferring substitution, isolation and engineering measures over reliance on behaviour. Two broader points follow. First, the matrix orders priorities but does not decide them: judgement about consequence potential, informed by Australian fatality data and the silicosis experience, pulled falls and silica to the top of the plan. Second, residual Medium ratings against catastrophic-consequence hazards are standing obligations, discharged through the consultation, SWMS discipline and review cycles described above. Managed in this way, the site meets the s 19 duty in substance: safety is produced by verified controls and genuine consultation, not by the paperwork recording them.
References
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