How Industrial Contractors Price Work

Every industrial price traces back to a single decision: who pays for the things nobody knew about when the bid went out. Federal acquisition rules sort contracts into two families on exactly that basis. Fixed-price arrangements put performance costs on the contractor. Cost-reimbursement arrangements put them on the owner. Everything else is a variation between those poles.

Private plant owners write their own agreements and are not bound by federal procurement rules, but they borrowed the vocabulary and most of the mechanics. So when a bid tab lists lump sum next to unit price next to time and materials, the underlying question is the same one the government asks: how much of the unknown is the contractor being paid to absorb.

One number for a defined scope. The contractor delivers what the drawings and specifications describe, and the price does not move unless the scope does.

The federal definition of a firm fixed price is blunt about the tradeoff: this structure places maximum risk and full responsibility for all costs on the contractor, while imposing the least administrative burden on both parties. That first half is why lump sum feels safe to an owner. The second half is why it is cheap to administer.

What it hides is contingency. A contractor pricing a lump sum on incomplete drawings has to guess at the unknowns and bury a number for them inside the total. You never see that line. If the unknowns do not materialize, the contingency becomes margin. If the drawings were genuinely complete, the contingency was small and the price is honest. The quality of a lump sum number is a direct function of how finished the design was when it was priced.

Excavation is the case that explains this structure. Nobody knows how many cubic yards of unsuitable material sit under a tank pad until a machine opens the ground. Pricing that as a lump sum forces the contractor to guess, and the guess is either padded or wrong.

A unit price schedule prices the work per cubic yard, per linear foot, per each. Quantities get measured in the field against agreed rates and paid on what was actually installed. It is the standard answer for structural concrete and site work where the design is settled but the ground is not, and it takes the quantity argument off the table before it starts.

The tradeoff is that the total is not known at award. An owner gets rate certainty, not price certainty. That is a real difference at budget approval, and it is worth saying out loud rather than discovering at the third pay application.

Fixed hourly rates by labor category, wrapped around wages, overhead, general and administrative expense, and profit, plus actual cost for materials. Simple to bill, easy to mistrust, and correct more often than its reputation suggests.

The federal rule allows this structure only when it is not possible at the time of award to estimate the extent or duration of the work with any reasonable confidence. That test is the honest one. A breakdown that stops a process unit does not wait for a takeoff. Neither does a discovery made after a vessel is opened during an outage. Pricing that work as a lump sum means paying someone to guess under pressure.

Two protections make it workable. First, the federal ceiling price rule requires a ceiling that the contractor exceeds at its own risk. Second, the same rule states plainly that time and materials gives a contractor no positive profit incentive for cost control or labor efficiency, and that owner oversight is required as a result. That is not a suspicion about contractors. It is written into the regulation. Daily tickets signed at the job site, crew counts verified, and a ceiling that means something are what turn T&M from a blank check into a controlled arrangement, and they are standard practice on turnaround and plant support crews.

Cost plus reimburses actual allowable cost and adds a fee. Books stay open, the owner sees real cost, and the contractor carries almost none of the cost risk. Used on its own it belongs to a narrow set of jobs: work where scope will develop as it proceeds and where the owner has the staff to audit what comes in.

The version that shows up more often on industrial projects adds a guaranteed maximum price. The owner still sees actual cost, but exposure stops at an agreed cap, and the contractor absorbs anything past it. That combination is why GMP tends to win on projects that need to start before design is finished.

The clause worth reading twice is the savings split. If the job lands under the cap, who keeps the difference. Contracts vary from all to the owner, to an even split, to arrangements weighted toward whoever the negotiation favored. It is a large number on a large job and it is often the last thing anybody reads.

Structure decides who carries risk. Exclusions decide what the price actually covers, and they are where most of the arguing happens on jobs that go badly. The wording is usually buried after the scope narrative and before the signature block.

None of these belong in every scope. Several of them belong in most, and a bid that stays quiet about all of them is not necessarily cheaper. It is less finished.

The same dynamic runs through every scale of construction with different vocabulary attached. A demolition contractor working residential and commercial jobs described it as the difference between a growing verbal ballpark and a flat written quote produced after a walkthrough, and the pattern he describes from field experience is the same one that shows up on an industrial bid tab. A number produced without seeing the conditions is a placeholder. It gets corrected later, at somebody's expense.

When two prices for the same scope land far apart, the gap is rarely labor rates. Three things account for most of it.

The first is what each contractor assumed about the unknowns. On a lump sum, that assumption is invisible, so a lower number can mean better productivity or it can mean thinner contingency. The second is exclusions. Pull both exclusion lists side by side and the cheaper bid often turns out to be a smaller scope. The third is structure itself. A unit price schedule and a lump sum for nominally the same work are not comparable numbers, because one of them is a rate sheet and the other is a commitment.

The practical move at bid review is to normalize before comparing: list every exclusion from both, add the missing items back to whichever bid excluded them, and then look at the totals. The ranking changes more often than people expect.