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Recognize a construction hazard by looking for an uncontrolled way that someone could fall, be struck, become caught, be exposed to electricity, or suffer another task-specific injury. Fix it by pausing the affected work, warning the people at risk, isolating or guarding the exposure, and verifying the correct control before work resumes. Personal protective equipment (PPE) supports those measures; it does not replace them.
This U.S.-focused guide uses OSHA’s construction framework for workers, supervisors, small contractors, and trainers. State Plans may impose different or more stringent requirements, and the applicable standard depends on the activity, equipment, location, and worker exposure. A site-specific hazard assessment, competent-person direction where required, and task-appropriate training remain essential.
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The most common construction hazards at a glance
OSHA’s “Focus Four” are falls, struck-by incidents, caught-in or caught-between incidents, and electrocution. They provide a practical starting point, not a complete inventory. Unguarded machinery, silica dust, asbestos, hazardous chemicals, noise, heat, and other exposures also require task-specific evaluation.
| Hazard | Warning signs to look for | Immediate control concepts |
|---|---|---|
| Falls | Unprotected edges, floor holes, wall openings, unsafe scaffolds, protruding rebar, unsecured or misused ladders | Guard or cover openings, install suitable guardrails or other protection, use properly selected and inspected ladders and scaffolds, and keep workers away until protection is in place |
| Struck-by | Reversing vehicles, blind spots, swinging equipment, suspended loads, unsecured materials, flying debris, unstable masonry | Separate people from movement, secure loads and tools, barricade danger zones, post warnings, and use suitable head and eye protection as supplemental protection |
| Caught-in or caught-between | Pinch points, unguarded moving parts, vehicle or equipment crush zones, collapsing walls, unsupported excavation walls | Guard or isolate moving parts, establish exclusion zones, stabilize structures, and follow the applicable excavation protective-system requirements under qualified direction |
| Electrocution | Overhead lines near equipment, unidentified underground utilities, damaged wiring, missing grounding or protective devices | Locate utilities, maintain the clearances and controls required for the specific situation, de-energize or guard when appropriate, and use electrical protective devices and safe work practices |
A hazard is not “fixed” merely because workers can see it or because a supervisor has warned them. The exposure must be controlled in a way that fits the task and the governing OSHA or State Plan requirement.
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How to identify hazards before work starts
Use a written safety and health plan
Start with a written site safety and health plan or program that identifies the work phases, responsible people, foreseeable hazards, required controls, training, emergency arrangements, and reporting method. The plan should be specific enough that a crew can tell what must be installed, inspected, or isolated before beginning a task.
OSHA’s infrastructure guidance emphasizes worker involvement: workers should help identify and report hazards, participate in the plan, and ensure that work starts only when the right controls are in place. The same guidance supports stopping work when controls need adjustment, replacement, or improvement.
Walk the work area and the work path
Inspect where people, vehicles, materials, and energy will move—not only where the task is standing. Look above, below, behind, and inside the work zone. Check access routes, temporary stairs, ladders, scaffold platforms, openings, lifting areas, power-line approaches, utility markings, excavation edges, and areas where another trade may enter.
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Ask four concrete questions:
- What could fall, move, swing, roll, collapse, or fly?
- What could energize a person or piece of equipment?
- Where could a person be pinned, crushed, pulled in, or buried?
- What change in weather, sequencing, equipment, or crew could create a new exposure?
Involve the people doing the work
Workers often know which guard is missing, which ladder shifts, which vehicle backs through a blind corner, or which delivery route conflicts with pedestrians. Provide a simple way to report those observations without waiting for an incident. Supervisors should respond to reports, communicate the correction, and update the briefing when the task or conditions change.
Describe the exposure precisely
A useful report names the location, task, people exposed, and the potential event. “Unsafe area” is too vague. “Two carpenters are installing sheathing beside an uncovered floor opening on the east side; a person could step or fall through” gives the safety lead enough information to choose a control.
Falls: recognize the edge, opening, and access hazards
Common fall warning signs
Look for unprotected sides and edges, wall openings, floor holes, improperly assembled or unguarded scaffolds, protruding reinforcing steel, and ladders that are unsecured, damaged, or being used for a purpose or position that is not appropriate. A change in elevation can become a fall exposure during demolition, formwork, roofing, steel erection, framing, stair installation, or housekeeping.
OSHA reports that 389 fatal falls to a lower level occurred among 1,034 construction fatalities in 2024, based on Bureau of Labor Statistics data as reported by OSHA. This is a dated fatality count, not an injury rate or a count of all falls.
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For covered construction exposures at six feet or more above a lower level, OSHA’s fall-prevention materials describe guardrail systems, safety nets, and personal fall arrest systems. The six-foot reference does not eliminate duties that may apply at other heights or in other activities; check the standard that covers the work.
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| Measure | What it does | When it is useful | What must be verified |
|---|---|---|---|
| Guardrail system | Prevents a worker from reaching or going over an edge | When a stable barrier can be installed without interfering with the work | Correct construction, secure attachment, complete edge protection, and inspection after alteration or impact |
| Safety net | Limits the consequences of a fall by catching a worker below | When a net can be installed close enough to the working level and kept clear of obstructions | Correct placement, clearance, condition, and inspection under the applicable requirement |
| Personal fall arrest system | Stops a fall after it begins | When anchorage, clearance, equipment, rescue planning, and trained use are available | Compatible components, inspected equipment, suitable anchorage, connection, free-fall and swing-clearance limits, and a prompt rescue plan |
OSHA generally prefers prevention systems such as guardrails when they are suitable. A harness by itself is not a complete fall-arrest system. Do not remove a guardrail for convenience and leave an opening unprotected while work continues.
Correct ladder and scaffold problems before climbing
Remove a damaged or unstable ladder from service. Set ladders on a firm, level base, secure them against movement, maintain the required setup for the task, and keep workers from carrying loads that prevent three-point contact. Scaffolds need the correct components, access, platform protection, foundation, and inspection by the person designated under the applicable rule. A scaffold that appears level can still be missing a guardrail, toe board, brace, or safe access.
Control protruding rebar and openings promptly
Cap, guard, cover, or otherwise protect protruding reinforcing steel where an impalement or fall exposure exists. Cover or guard floor holes and wall openings as soon as they are created; mark a cover so workers know its purpose, and secure it against displacement. Never assume that a piece of plywood is adequate without checking its strength, attachment, and the requirement that applies to the opening.
Struck-by hazards: separate people from moving energy
Vehicles, mobile equipment, and blind spots
Map vehicle routes and pedestrian paths before deliveries or earthwork begin. Reversing equipment, turning radii, loading areas, and blind corners create predictable conflict points. Keep workers outside the equipment’s travel and swing zones, use a communication method understood by the operator and spotter, and do not rely on eye contact alone.
OSHA’s construction guidance recommends high-visibility clothing near vehicles and equipment. Visibility is supplemental: it does not make it safe to stand behind a reversing truck or inside a crane’s swing radius.
Falling and flying objects
Secure tools, pipe, lumber, masonry, formwork, and other materials against sliding, rolling, tipping, or being blown from an elevated level. Establish a barricaded area below overhead work and post warnings. Keep people out from under suspended loads and never use a suspended load as a work platform.
Depending on the exposure, appropriate falling-object protection may include toe boards, screens, guardrails, debris nets, catch platforms, or canopies. Hard hats and eye protection can reduce injury from residual falling or flying objects, but they do not substitute for securing the source or excluding people from the danger area.
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Partially demolished, newly erected, or weather-exposed walls can overturn without obvious movement. Keep workers and equipment outside the potential collapse zone until the assembly is engineered, braced, sequenced, or otherwise stabilized as required. Do not allow a crew to work below or beside unstable masonry simply because no crack is visible.
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Caught-in and caught-between hazards: find the crush zone
Pinch points and machinery
Identify every point where a body part, clothing, tool, or material could be drawn into, sheared by, or crushed between moving components. Guards should remain installed on machinery; isolate energy before servicing or clearing a jam under the site’s procedure. Keep hands out of the line of fire and use tools or positioning methods that keep the worker outside the pinch point.
Vehicles, materials, and structural collapse
Crush zones exist between a vehicle and a fixed object, between stacked materials, at swinging attachments, and beneath loads that can shift. Use barriers, designated positioning areas, stable stacking, and clear communication. Never place a worker between moving equipment and a wall, trench edge, delivery vehicle, or other immovable object unless the task-specific procedure provides a controlled method.
Excavations require a task-specific decision
Excavation walls can collapse with little warning. Soil appearance alone cannot establish that a trench is safe. Protective-system requirements are specific to the excavation, soil and water conditions, depth, adjacent loads, equipment, access, and other factors. A qualified person must direct the evaluation and the protective system under the applicable OSHA excavation standard. If the required protection is missing or conditions change, keep workers out until the site’s qualified direction restores it.
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Electrical hazards: control contact with energized sources
Overhead lines and equipment approach
Before cranes, aerial lifts, ladders, pumps, scaffolds, or long materials enter an area, identify overhead lines and plan the work around them. A line can remain energized even when it looks inactive. Do not insert a universal clearance distance into a plan; the required separation depends on the equipment, voltage, conditions, and governing standard. Obtain the site’s qualified direction and utility coordination before positioning equipment.
Underground utilities
Locate and identify underground utilities before digging, drilling, driving stakes, or placing supports. Confirm markings through the site’s utility-locating process and protect them as work progresses. An unmarked or inaccurately marked line is a reason to pause, not to continue cautiously with the assumption that it is harmless.
Electrical equipment and temporary power
Look for damaged cords, exposed conductors, missing covers, improvised connections, wet conditions, absent grounding, and protective devices that are bypassed or inoperable. Possible controls include insulation, guarding, grounding, electrical protective devices, de-energization, and safe work practices selected for the task.
OSHA’s Quick Card advises using ground-fault circuit interrupters and observing overhead lines. A GFCI can reduce shock risk but does not make damaged equipment acceptable or authorize work on an energized system.
OSHA quotes 29 CFR 1926.21(b)(2): “The employer shall instruct each employee in the recognition and avoidance of unsafe conditions and the regulations applicable to his work environment to control or eliminate any hazards or other exposure to illness or injury.” Training must address the actual equipment and conditions workers will encounter.
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Other construction hazards that need their own controls
Unguarded machinery
Fixed and portable machinery can expose workers to rotating parts, blades, belts, points of operation, and unexpected startup. Keep manufacturer or required guards in place, prevent access to the danger zone, and follow the site’s energy-control procedure before maintenance, cleaning, adjustment, or jam removal.
Silica dust
Cutting, grinding, drilling, or crushing masonry, concrete, stone, and similar materials can generate respirable silica. Use the task-specific engineering, work-practice, housekeeping, exposure-assessment, and respiratory-protection measures required for the work. A general warning to “wear a mask” is not a complete silica-control program.
Asbestos and other regulated materials
Older buildings and some products may contain asbestos. Do not disturb suspect material based on appearance or assume ordinary dust control is sufficient. Stop the task and follow the employer’s evaluation, competent-person, licensed-abatement, and regulatory procedures before disturbing it.
Noise, heat, cold, chemicals, welding fumes, biological hazards, and ergonomic strain may also be significant. Add them to the site and task assessment rather than treating the Focus Four as an exhaustive list.
What to do when you see an unsafe condition
- Pause the affected task. Stop when a serious hazard is visible or a required control is missing. Move people away from immediate danger without creating a second exposure.
- Alert the responsible person. Notify the supervisor, competent person, or designated safety lead through the site’s reporting method. If the condition is changing rapidly, use the fastest reliable warning available.
- Describe the exposure. State the location, task, people at risk, and what could fall, strike, energize, collapse, or trap someone. Include changes in weather, sequencing, equipment, or nearby work.
- Establish immediate controls. Under site procedures and qualified direction, stop equipment, isolate energy, barricade the area, guard an opening, secure materials, or keep people clear of a suspended load or collapse zone.
- Select and verify the permanent control. Install the task-appropriate guard, protective system, separation, utility control, stabilization, or other measure. Confirm that it is correctly assembled, accessible, and compatible with the work.
- Brief the crew before restarting. Explain what changed, who may enter, what inspections are required, and what conditions require another stop. Update the plan or pre-task briefing when the work sequence changes.
Workers should never be pressured to continue while a control is being adjusted, replaced, or improved. OSHA’s safety-plan guidance expressly supports stopping work for that reason.
How supervisors can verify a control before restart
| Verification question | Examples of evidence |
|---|---|
| Does the control address the actual hazard? | A barrier blocks the opening; a load is secured; a utility is located; a machine guard covers the point of operation |
| Can the control withstand the work conditions? | The guardrail, cover, brace, barricade, or exclusion zone remains effective during movement, weather, vibration, and the planned sequence |
| Is the control installed and inspected by the right person? | The designated competent or qualified person has completed the inspection required for that task, equipment, or protective system |
| Do workers understand the limits? | The crew knows where it may work, which access route to use, what PPE is required, and which change triggers a stop |
| Is there a recovery plan if the control fails? | Workers know how to withdraw, summon help, report the condition, and avoid entering a fall, electrical, collapse, or crush zone to perform an improvised rescue |
Training, communication, and changing conditions
Training should cover hazard recognition, applicable rules, equipment operation, reporting, emergency actions, and the limits of PPE. OSHA’s electrical rule requires instruction in recognizing and avoiding unsafe conditions and the regulations applicable to the work environment. The same principle applies across the site: a worker must know both the warning sign and the action that follows it.
Repeat or update the briefing when a new trade arrives, the sequence changes, weather affects stability or visibility, a utility is uncovered, an opening is created, equipment is moved, or a control is removed for a legitimate task. A control that was adequate during framing may be wrong during roofing, demolition, or finish work.
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When work must remain stopped
Keep the task stopped when the hazard cannot be isolated, the required protective system is absent or damaged, the responsible qualified person is unavailable, workers do not understand the control, conditions have changed beyond the plan, or restarting would depend on a guess about clearance, stability, load capacity, or energy status. Resume only after the appropriate person verifies the control and communicates the restart conditions.
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