Responding is Erin Mitchell, product marketing manager, Corfix, Ottawa, Ontario.
Managing risk on a construction site is relatively straightforward when one employer controls the work. Add multiple subcontractors, and the risk-management problem changes entirely. One trade’s work routinely creates hazards for workers of another trade. Overhead work generates struck-by hazards for crews at lower elevations. Excavation and trenching affect the workers who follow.
The worker most likely to be harmed is often not employed by the company that created the hazard. This isn’t unusual on a multi-trade site. It’s the norm. And it doesn’t sort itself out because everyone shows up with good intentions.
Effective risk management on a shared site starts with understanding who owns the risk. OSHA’s multi-employer citation policy makes the accountability structure explicit. On a shared worksite, more than one employer can be cited for the same hazardous condition. The policy identifies four employer roles: creating, exposing, correcting and controlling.
A general contractor typically functions as the controlling employer, meaning it has general supervisory authority over the site and the power to require others to correct violations. Under that designation, it’s expected to exercise reasonable care to detect and prevent hazards, even those created by subcontractors. That’s a broader obligation than most general contractors realize until they’re sitting across from a compliance officer.
The most practical risk management tool for getting ahead of this is the premobilization meeting, which takes place before each new trade arrives onsite. It’s a working session in which the incoming subcontractor’s foreperson reviews current site conditions, active hazards from other trades, overlap zones, and what documentation they’re expected to produce.
Hazard assessments are the documentary backbone of that risk-management effort. A site-specific assessment that only accounts for the general contractor’s own scope isn’t actually site-specific. It needs to cover the full picture of what’s happening on that project, be updated as new trades mobilize or scopes change, and be accessible to the supervisors who need to act on it. A document filed in the site trailer doesn’t protect anyone in the field.
None of this is complicated in concept. The execution is where it breaks down. Subcontractors arrive with their own safety culture, their own habits and their own assumptions about how things are done. Some of those assumptions won’t match the site’s requirements. The premobilization process and consistent site-level monitoring are what close that gap, but only if someone is genuinely running them rather than checking a box.
Risk management on a multi-trade site is ultimately a coordination problem. The general contractor can’t control every employer’s safety culture. What they can control is the structure they put around them, and that structure is the risk management program.
Editor’s note: This article represents the independent views of the author and should not be considered a National Safety Council endorsement.
