A scope gap is the work that falls between two subcontractor packages, or out of every package, because no scope sheet ever named it. Sometimes it is a missing line item — the gas line for the gas fireplace nobody routed to. Sometimes it is an interface — the flashing between the masonry and the storefront that both subs assumed the other carried. Sometimes it is a substitution — cast iron specified, plastic priced, and a GC who finds out at first inspection. The shape changes; the consequence is the same. Once a gap is exposed, somebody has to pay for it, and the negotiation only goes one direction.
The chain of consequences
Scope gaps do not stay scope gaps for long. A Pre-Construction Lead at a Top-ENR Canadian GC describes the typical lifecycle in a single line: “if you miss anything, they'll bill it.” What follows is the well-worn sequence — the sub raises a change order; the GC's project manager pushes back; the work continues under protest; the dispute lands on the owner's desk; and if the contract has any “readily inferable” language at all, the owner refuses to pay, and the GC eats it. That last step is so common that one Senior PM at a Canadian ICI GC calls the readily-inferable clause “one of the worst clauses in a construction contract.”
The financial cost is visible. The relationship cost is worse. A VP of Pre-Construction at a Mid-Market US Commercial GC put it plainly: a building project is a “two- to two-and-a-half-year relationship that you either battle constantly, or you've decided up front who's going to be responsible for what.” Subs remember which GCs surfaced ambiguity at bid time and which GCs let them eat it after award. The next time the same sub gets a bid invitation, the markup goes up. Scope gaps compound across projects in a way line-item disputes do not.
The numbers the industry reports
Across the public benchmarks, scope and contract-document errors are the leading driver of construction disputes.
- Arcadis's 2025 Global Construction Disputes Report puts the average U.S. construction dispute value at $60.1 million in 2024, with a 12.5-month average resolution time in North America — and identifies “errors and omissions in contract documents” as the top cause in six of the last nine years.
- FMI's Construction Disconnected study estimates that rework caused by miscommunication and inaccurate project data costs the U.S. industry approximately $31 billion annually, with 26% of rework attributed to communication breakdowns and 22% to bad project data.
- Navigant's analysis of change orders, widely cited and re-published by the AIA, finds change orders typically running 8–14% of project cost on commercial work — and routinely above 25% on projects with weak scope definition. A/E errors and omissions alone account for 3–5% of total construction budget on average.
- McKinsey's research on construction productivity finds large projects running 20% longer and up to 80% over budget; 98% of megaprojects suffer cost overruns of more than 30%.
- The AGC/FMI Risk Management Survey ranks contract language alongside labor shortage and subcontractor default as a top-three risk identified by best-in-class contractors.
The numbers the operators report
The interview transcripts pile concrete dollar figures on top of the industry stats. Six representative examples, anonymized:
We have less subs who just kind of a gentleman's agreement, “we're going to bid and give you everything you want, don't worry about it.” They've become more quick to clarify that we're not including that one piece of scope because it's not in our wheelhouse.
The thesis of this book is straightforward. Scope gaps are caused, not random. They are caused by specific habits — some unconscious, some deliberate, all changeable. The chapters that follow are organized around the habits that produce a scope of work the field can actually live with, and the habits that produce the gaps.