What are the Fatal Four in construction?

The Fatal Four (also called OSHA’s Focus Four) are the four hazards responsible for the majority of construction worker deaths: falls, struck-by, caught-in/between, and electrocution. Falls are the single largest category and OSHA’s most-cited standard. Together these four consistently account for well over half of all construction fatalities, which is why OSHA concentrates enforcement and training on them.

Which of the Fatal Four causes the most deaths?

Falls. Falls from height are consistently the leading cause of construction fatalities and OSHA’s most-cited standard year after year. The other three — struck-by, caught-in/between, and electrocution — round out the group, but falls sit clearly at the top, which is why fall-hazard enforcement is so heavily emphasized.

Where is OSHA focusing construction enforcement in 2026?

OSHA’s 2026 programmed and targeted inspections continue to emphasize the hazards behind the most deaths: falls, struck-by, caught-in/between, electrical, and trenching. Enforcement is increasingly data-driven and documentation-focused, so contractors with documented daily safety routines and hazard controls are in a much stronger position when an inspection comes.

How do you prevent the Fatal Four?

With the same daily discipline for all four: name the day’s exposures at the morning briefing, confirm the controls are in place before work starts (guardrails and tie-offs for falls, spotters and exclusion zones for struck-by, protective systems and safe egress for trenches, GFCIs and clearances for electrical), assign competent persons where required, and document the briefing. The controls are well understood — the failure is skipping them under time pressure.

The Fatal Four in 2026: OSHA Enforcement & Prevention | SafeBrief

Every year, the same four hazards kill more construction workers than everything else combined. OSHA calls them the Fatal Four — falls, struck-by, caught-in/between, and electrocution — and they have held that grim ranking for a long time because the failures behind them are ordinary, repetitive, and preventable. This is not a mystery to solve; it is a list to work. OSHA’s enforcement in 2026 is aimed squarely at these four, with targeted inspections on falls, struck-by, caught-in/between, electrical, and trenching. If you want to know where a compliance officer’s eyes go the moment they step on your site — and where your crew is most exposed — start here.

Why these four, and why they still lead

The Fatal Four earn the name from the data. Across OSHA and BLS reporting, these four causes consistently account for well over half of all construction worker deaths in a given year. Falls alone are the single largest category — the leading cause of construction fatalities and OSHA’s most-cited standard, year after year. The other three trade places behind it, but the group as a whole is remarkably stable, which tells you something important: these are not freak accidents. They are the predictable result of the same handful of controls being skipped.

That stability is exactly why OSHA can target them. When you know most deaths come from four causes, you point your inspectors at those four. In 2026, that means programmed and targeted inspections continue to emphasize falls, struck-by, caught-in/between, electrical hazards, and trenching. The agency’s enforcement is increasingly data-driven, and the data has pointed at the Fatal Four for years.

1. Falls — the leading killer, and the top citation

Falls from height are the defining hazard of construction. On a real site they look like a worker on a leading edge with no guardrail, someone on a roof without a personal fall arrest system tied off to a real anchor, a floor or roof hole without a secured cover, an unguarded scaffold platform, or a ladder set wrong and used wrong. The fall protection trigger in construction is generally 6 feet above a lower level — above that, you need guardrails, a personal fall arrest system, or a safety net, selected for the work.

Falls stay on top for a reason that has nothing to do with difficulty: the controls exist and are well understood, but they get skipped for speed on a “quick” task. The two-minute roof trip with no tie-off is the one that kills. Because falls are the leading fatality cause and the most-cited standard, they are also where OSHA’s targeted fall-hazard enforcement is most active — and where documented daily attention pays off most.

2. Struck-by — the hazard hiding in normal work

Struck-by injuries come from objects and equipment in motion: a load swinging off a crane or forklift, materials falling from above, a nail or fragment from a tool, and — one of the deadliest — vehicles and mobile equipment striking a worker on foot. On the ground, struck-by looks like a crew working under a suspended load, a spotter who isn’t there when a truck backs up, unsecured material stacked near an edge, or a worker in the swing radius of an excavator.

→Keep workers out from under suspended loads, always.
→Use spotters and a traffic plan wherever vehicles and people share ground; high-visibility PPE is the last layer, not the first.
→Secure tools and materials at height so nothing becomes a projectile.
→Respect swing radiuses and set exclusion zones around operating equipment.

3. Caught-in/between — trenches, machinery, and pinch points

Caught-in/between kills when a worker is trapped, crushed, or squeezed — between equipment and a fixed object, in unguarded machinery, or, most notoriously, in a collapsing trench. A cubic yard of soil weighs on the order of a small car; a trench wall that fails buries a worker faster than anyone can pull them out, which is why trenching sits at the center of this category and at the center of current enforcement.

On site, caught-in/between looks like an unprotected excavation five feet or deeper with no sloping, shoring, or shield; a worker between a swinging counterweight and a wall; or an unguarded rotating shaft or pinch point on machinery. Trenching in particular has drawn recent fatal-incident citations and remains a targeted enforcement priority — a competent person, a protective system, and a safe way in and out are non-negotiable.

4. Electrocution — overhead lines, contact, and bad temporary power

Electrocution deaths come from contact with energized sources: overhead power lines struck by cranes, ladders, or scaffolds; damaged cords and tools; missing GFCIs on temporary power; and work on circuits that should have been de-energized and locked out. Overhead line contact is a leading killer in this category because the clearance gets misjudged during a lift or a move.

→Maintain safe clearance from overhead lines and treat every line as energized until proven otherwise.
→Use GFCI protection on temporary power and inspect cords and tools before use.
→De-energize and lock out equipment before servicing — energized work is a last resort with its own strict rules.
→Use non-conductive ladders near electrical work; never a metal ladder around energized conductors.

The four talks that map to the four hazards

The daily habits that keep a crew off the list

Here is the encouraging part: because the Fatal Four are so consistent, the prevention is consistent too. You do not need a new program for each hazard every morning. You need a short, honest daily conversation that names the day’s exposures and the controls, and a record that it happened.

Name the day’s Fatal Four exposures out loud at the morning briefing — who’s working at height, near equipment, in an excavation, or around power today.
Confirm the controls are in place before work starts, not after — guardrails and tie-offs, spotters and exclusion zones, protective systems and safe egress, GFCIs and clearances.
Assign the competent person for the tasks that require one — fall protection, excavation, scaffolding — and make sure the crew knows who it is.
Document the briefing with a date, the topics, and who was there. It prevents the incident and it is exactly the record OSHA asks for after one.
Fix and log hazards as you find them, so your history shows a crew that manages these four every day — not one that reacts after a citation.

This is the whole case for a disciplined daily briefing. The Fatal Four are prevented by attention, and attention is prevented by friction. SafeBrief removes the friction: a weather-aware daily briefing for your site, crew sign-in, and a signed, dated PDF that documents the exact hazard conversation OSHA wants to see. On Pro, the AI Hazard Scan lets a foreman photograph a leading edge, a trench, a tangle of cords, or a load path and get an instant read with the evidence saved. Point your daily habit at the four hazards that do the killing, and you are working the same list OSHA is.

Where the officer looks first

A compliance officer stepping onto your site scans for the Fatal Four before anything else, because that is where the data says the deaths are. So should you, every morning. If your crew can point to the day’s fall, struck-by, caught-in, and electrical exposures and the controls for each — and you can produce the record — you are ahead of both the hazard and the inspection.

The Fatal Four in 2026: Where OSHA Is Actually Looking