Occupational risks in construction are the situations that endanger workers' safety and health arising from the tasks, equipment, and conditions typical of a construction site.
Identifying these risks seems obvious in a sector with high accident rates, but day to day the pressure of deadlines and the concurrence of work areas cause preventive measures to slacken just when they are needed most. Correctly assessing recurring risks and planning their prevention is the decisive step to reduce serious accidents and comply with Act 31/1995 on the Prevention of Occupational Risks and Royal Decree 1627/1997.
In this guide we review the five most common groups of risks on site, their prevention measures, and how to integrate them into preventive planning. For the documentary framework that supports them, review the health and safety plan on site.
1. Falls from height
These are the most frequent cause of serious and fatal accidents on site: work on scaffolding, roofs, floor-slab edges, ladders, or lift shafts.
- Prevention measures:
- Prioritise collective protection (rigid perimeter guardrails, safety nets) over individual protection.
- Mandatory use of a fall-arrest harness connected to inspected, certified lifelines where there is no collective protection.
- Prior inspection of scaffolding and elevating platforms before each use.
2. Cave-ins and ground collapses
A critical risk associated with excavation, earthworks, trenches, and pits, where a soil collapse can bury the worker in seconds.
- Prevention measures:
- Provide adequate shoring or trench shielding according to the type of ground.
- Respect the natural slope angles in excavations.
- Keep material storage and heavy machinery outside the safety strip at the trench edge.
3. Impacts, entrapment, and falling objects
Caused by handling machinery, transporting suspended loads, debris falling, or a lack of order and cleanliness in the work areas.
- Prevention measures:
- Non-negotiable use of a hard hat, safety footwear with reinforced toecaps, and high-visibility clothing.
- Demarcation and signage of the machinery manoeuvring and load-lifting areas.
- Installation of protective canopies and debris-catching nets.
4. Electrical contact
Arising from proximity to overhead or underground power lines and the use of faulty temporary panels or electrical tools.
- Prevention measures:
- Prior verification of interference with existing electrical networks.
- Use of approved site electrical panels with residual-current devices and proper earthing.
- Periodic maintenance and inspection of wired machinery and tools.
5. Ergonomic risks and exposure to harmful agents
Manual handling of loads, forced postures, vibration, continuous noise, and exposure to crystalline silica dust, one of the most closely monitored hygiene risks in the sector.
- Prevention measures:
- Prioritise mechanical means for lifting and transporting loads.
- Use cutting tools with integrated extraction or wet cutting to suppress silica dust.
- Provide self-filtering masks (FFP3) and hearing protectors with adequate attenuation.
A particular high-risk case is working in confined spaces, which combines hazardous atmospheres with difficult evacuation and requires specific procedures.
From identifying the risk to effective prevention
Listing the risks is not enough: effective prevention requires a continuous cycle of assessment, planning, execution, and verification. The risk assessment identifies the hazards of each work unit; the safety plan defines the measures; execution implements them on the ground; and verification checks that they are followed and corrects deviations.
The weak point is usually verification: without a record of the reviews or evidence of the corrections, it is impossible to demonstrate due diligence or learn from incidents. Digitising the follow-up with geolocated work reports lets you document each safety inspection with a photo, date, and responsible party, and close the preventive cycle. This control fits within the framework of the construction site safety regulations.
How Trowel helps
| Problem | How Trowel solves it |
|---|---|
| Safety inspections without a record or evidence | A mobile module to audit and record safety reviews with work reports, a signed photo, date, and location |
| Corrective measures that are not closed or verified | Tracking the status of each incident until its verified resolution |
| Lack of control over subcontractors' training and PPE | Alerts on the expiry of preventive training and medical checks before site access |
| Preventive documentation scattered and inaccessible on site | Centralised documentary management available from the work area |
You can see the technical detail of each module in Trowel Academy.
Frequently asked questions
What is the most frequent occupational risk in construction?
Falls from height are the main cause of serious and fatal accidents on site, especially in work at height, on roofs, and at floor-slab edges.
What is the difference between collective and individual protection?
Collective protection (guardrails, nets) protects everyone in the area without depending on their action, which is why the regulations prioritise it over individual protection (harness, hard hat), which only protects the person using it.
Who must assess the occupational risks of a site?
Risk assessment is the employer's responsibility, carried out through its prevention service. On site it is set out in the health and safety study and plan.
How do you prove that prevention measures have been applied?
Through the record of safety inspections, the entries in the incident log, and the documentary evidence of training, PPE handovers, and corrections made.
Conclusion
Occupational risk prevention is not a formal imposition but an investment that protects workers' lives and the viability of the works. Knowing the most frequent risks is the first step; turning their prevention into a verifiable cycle of assessment, execution, and control is what really reduces accident rates.
Continuous training of the teams and rigorous recording of preventive measures are the most effective ways to get closer to the zero-accident goal. If you want to digitise the safety control of your sites, request a free Trowel demo.
You may also be interested in
- Health and safety plan on site: step-by-step guide →
- Construction site safety regulations →
- Confined spaces: risk prevention on site →
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