The commercial exposure generated when the people who make sequence decisions cannot see the cost of making them
Definition
Erection sequence risk is the commercial exposure that arises when decisions affecting the order, timing or conditions of structural assembly are made by people without visibility of the erection plant cost that depends on that sequence. Every delay to an element that a crane, gantry, vessel or other erection plant is waiting on generates standby cost at the plant day-rate. Erection sequence risk is the gap between who makes that decision and who sees the financial consequence.
The concept is not the same as programme risk, which is the risk of activities taking longer than planned. Erection sequence risk is specifically about the interface between technical or administrative decisions and commercial exposure that is live, measurable and accumulating at a known daily rate — and is invisible to the people making those decisions.
It is also distinct from claim risk, which is the exposure once a delay has occurred and its contractual allocation must be negotiated. Erection sequence risk is the upstream condition that creates the claim.
Where It Arises
Temporary works approval delays. A designer requests additional time to complete a temporary works check. The check is reasonable. But the crane is on standby. The designer does not know the day-rate. Nobody in the approval conversation mentioned it. The approval takes eight days. Eight times the crane standby rate is the exposure — before any consequential programme impact is assessed.
Sequence changes agreed on site. A verbal agreement between two engineers changes the erection sequence to accommodate a civil works interface. The change is technically sound. But it extends the period during which the primary crane is occupied, and the secondary crane cannot begin its scope. Neither engineer knew the compounding rate running against the decision.
Access area release delays. A client representative withholds access area release pending internal sign-off. The gantry is positioned at the pier, cannot advance, and is accumulating standby cost. The client representative does not know what the gantry costs per day at rest.
Approval chain parallelism failures. Three parties review a lift study sequentially rather than in parallel. Eleven days are consumed by handoffs that could have been concurrent. The vessel is on-station throughout.
The Mechanism
The underlying mechanism is always the same: a dependency exists between a decision and an erection plant cost, but the decision-maker is not in the information loop that would make the cost visible. On the Jamuna Bridge, river conditions made the dependency between pier readiness, access and erection sequence unusually visible to everyone on the project. On most projects the same dependency is less visible — it sits between programme logic, approvals and plant cost records, and never appears in the room where the technical decision is made.
Physical visibility of commercial consequence produces better decisions than contractual allocation of risk. Every time.
The practical problem is timing. By the time a delay becomes a claim, the cost has already been incurred. Erection sequence risk exists earlier — when a technical approval, access release, interface decision or sequence change is still being discussed, but the crane, gantry or vessel is already committed. The commercial value of the concept is not blame allocation. It is making the cost consequence visible before the decision is made.
Original diagram — EE&HL Network 2026 · In preparation
Diagram: Original — EE&HL Network 2026
Frequently Asked Questions
Erection sequence risk is the commercial exposure that arises when decisions affecting the order, timing or conditions of structural assembly are made by people without visibility of the erection plant cost that depends on that sequence.
Programme risk is the risk of activities taking longer than planned. Erection sequence risk is specifically about the interface between technical or administrative decisions and commercial exposure that is live, accumulating at a known daily rate — and invisible to the decision-maker.
Temporary works approval delays, sequence changes agreed on site, access area release delays and approval chain parallelism failures are the four principal mechanisms through which erection sequence risk is realised.
