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Concrete subcontractors form, place, and finish the footings, foundations, slabs, and flatwork a project stands on, and on many jobs they also place reinforcing steel and set the embeds other trades build from. The scope leads the schedule: it follows grading, and nothing vertical starts until it is poured and stripped. The decisive coordination happens before the truck arrives. Under-slab plumbing and electrical must be installed, tested, and inspected before the pour; anchor bolts, hold-downs, and embeds have to be set to the structural drawings; and most jurisdictions require a pre-pour inspection once forms and steel are ready. A missed embed is cheap the day before the pour and expensive forever after, so hold a pre-pour walk against the anchor bolt plan with the framer or steel erector who will build on it. Pour day itself is a logistics exercise: pump access, truck spacing, finishing crew size, and weather all have to line up, and a concrete sub's quality shows in how they plan for hot or cold weather rather than how they react to it. Testing is usually carried by an owner-hired materials lab rather than the concrete sub, but define in the subcontract who schedules the technician and what happens when a cylinder breaks low, because the investigation that follows a low break can hold a critical-path slab. When comparing bids, check what each actually carries: mix design and strength, reinforcement, vapor barrier, finish spec, curing method, and pump costs are where bids quietly diverge. In California, concrete contractors typically hold a CSLB C-8 classification, which covers forming, pouring, placing, and finishing concrete work. Texas has no state-level license for concrete work; requirements are municipal where they exist. We recommend confirming license status where applicable and current liability and workers' comp insurance before award.
Under-slab plumbing and electrical must be in, tested, and inspected, since concrete covers them permanently. Forms, reinforcement, vapor barrier, anchor bolts, and embeds need to match the structural drawings, and most jurisdictions require a pre-pour inspection before the trucks are called. Line those items up days ahead, because a same-morning surprise cancels the pour.
The structural engineer specifies them, the concrete sub typically sets them, and the framer or steel erector inherits whatever lands in the concrete. Because three parties touch the same hardware, put layout responsibility in the subcontract and walk the layout against the anchor bolt plan before the pour with the trade that builds on it next.
In California the classification is CSLB C-8, which covers forming, pouring, placing, and finishing mass, pavement, and flat concrete work. Texas has no state-level license for concrete; some cities require contractor registration. We recommend confirming CSLB status through the free public lookup and checking municipal rules on Texas projects.
Field testing and cylinders are usually carried by a materials lab hired by the owner or GC, not the concrete sub, though the sub coordinates access on pour day. A low break triggers an investigation that can involve additional testing or coring before the slab is cleared, which can hold the schedule. Define in the subcontract who schedules the lab and who owns each outcome.
Hot weather accelerates set and risks finishing problems; cold weather slows strength gain and can require protection measures before forms are stripped or loads applied. A good concrete sub plans mix adjustments and protection ahead of the forecast instead of reacting on pour day. Agree up front on who calls a weather postponement and how standby costs are handled.
It varies by scope. The main drivers are volume and access, formwork complexity, the reinforcement carried, mix design and strength, finish specification, and whether a pump is needed. Bids also split on vapor barrier, curing method, and excavation spoils, so compare inclusions before comparing totals.
