The main company awarded a project contract who then hires subcontractors to perform portions of the work. As a sub, your agreement, invoicing, and compliance obligations flow through them—not the end client. They carry overall site liability and typically control scheduling and scope.
Prime Contractor
Related Terms
T&D (Transmission and Distribution)
IndustryThe network of high-voltage power lines, towers, substations, and local distribution lines that move electricity from generators to end users. Subcontractors in this sector handle tasks like line construction, pole installation, and substation work. T&D projects are often awarded through utility frameworks or provincial grid operators.
Multi-Zone Testing
IndustryA well evaluation process where multiple reservoir intervals are tested separately in a single wellbore operation. Subcontractors must coordinate pressure testing, fluid sampling, and equipment rigging across several zones. Scope changes between zones can affect crew hours, tool rentals, and invoicing significantly.
Grade Separation
IndustryA crossing where a road, pipeline, or utility passes over or under another route using a bridge or culvert. Subcontractors must account for grade separations when planning equipment moves and material hauls. Permits and escort requirements often apply when loads approach clearance limits.
AFE (Authorization for Expenditure)
IndustryA budgeting document used in oil and gas projects that outlines expected costs and seeks approval before work begins. Subcontractors often work under AFEs issued by operators.
VRU (Vapour Recovery Unit)
IndustryA compression system that captures hydrocarbon vapours from storage tanks or production equipment instead of venting them. Subcontractors are often hired to install, maintain, or service VRUs to meet emissions regulations. Familiarity with VRU work is increasingly required on oil and gas production sites.
Mobilization/Demobilization
IndustryThe process of moving equipment and personnel to a job site (mobilization) and returning them afterward (demobilization). Often billed as separate line items.
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