The OSHA Fatal Four in Construction: Causes and Prevention Strategies

By Abbie Geigle

The crew had performed the task many times before. A short assignment near the edge of a roof. The weather was clear. The timeline was tight. It felt routine.

But routine work at height is still work at height.

A single misstep without proper fall protection turned a normal workday into a fatal incident — one that fits into a category OSHA has documented repeatedly: the “Fatal Four.”

Construction remains one of the most hazardous industries in the United States. According to OSHA, the majority of fatal construction injuries fall into four predictable categories: falls, struck-by incidents, caught-in or caught-between hazards, and electrocution. Together, these hazards account for most jobsite fatalities each year.

Falls consistently rank as the leading cause. Workers face exposure while roofing, working from scaffolds, climbing ladders, or operating near unprotected edges. Often, the task feels brief or familiar, which can lead to shortcuts. OSHA construction standards require fall protection when workers are exposed to elevation hazards, yet incidents continue when guardrails are missing, personal fall arrest systems are misused, or hazard assessments are rushed.

Struck-by hazards occur in dynamic environments where heavy equipment moves, materials shift, and loads are lifted. A backing vehicle, a falling tool, or an unsecured load can escalate quickly without clear communication and site planning.

Caught-in or caught-between incidents frequently occur during trenching and excavation work or when operating heavy machinery. Inadequate trench protection systems or improper equipment positioning can create catastrophic conditions within seconds.

Electrocution risks are also common in construction due to temporary wiring, overhead power lines, and energized equipment. Contact with live sources, improper grounding, and failure to maintain safe clearance distances continue to contribute to serious injuries.

The reason the Fatal Four persist is not because they are unknown — it is because familiarity reduces perceived risk. When hazards are common, they are often underestimated.

Construction safety improves when hazard recognition becomes intentional and consistent. Proactive planning, supervisor oversight, and structured construction safety training reinforce OSHA compliance and reduce preventable risk.

Because falls remain the leading cause of construction fatalities, strengthening fall protection awareness is a practical starting point. OSHAcademy's Fall Protection for Construction course helps workers identify fall hazards, understand protective systems, and apply OSHA fall protection requirements effectively. Learn more here:

Predictable hazards require proactive preparation — and preparation begins with education.