The Hidden Cost of 'Voluntary' Scope Gaps Between Trades

On every public works project, there are tasks that fall between trades — not clearly assigned to any single subcontractor's scope. Core drilling through a structural wall: is that the plumber's scope or the GC's? Temporary shoring for an excavation: is that the earthwork sub or the utility installer? Fire caulking penetrations: electrical, mechanical, or firestopping sub?

These "scope gaps" are where some of the most contentious disputes originate. When no one's bid explicitly includes the work, someone still has to do it — and the fight over who pays is predictable and expensive.

How Scope Gaps Form

Scope gaps typically arise from three sources:

1. Incomplete design documents. When plans and specs don't clearly assign a task to a specific trade or CSI division, each subcontractor reasonably assumes it's not their responsibility. 2. GC bid packages that don't cover every item. The GC divides the project into trade packages, and items that don't fit neatly into one package get overlooked. 3. Assumptions that don't align. The mechanical sub assumes the GC will provide roof openings. The GC assumes the mechanical sub's scope includes cutting their own openings. Neither confirms the assumption until the work is needed.

The result is a task that nobody budgeted for, nobody planned for, and everybody expects someone else to perform.

Who Pays — and How to Avoid Being That Sub

In practice, scope gaps are most often absorbed by the subcontractor who can't proceed without the gap being filled. If the plumber can't install their piping until someone core-drills the wall, the plumber ends up doing it — because waiting for the GC to resolve the question costs schedule time and creates delay exposure.

This is exactly why exclusions matter. If your proposal explicitly states "Core drilling through structural elements is excluded," you've created a documented boundary. When the gap surfaces, the record shows it was excluded from your scope before award.

The most effective defense is a comprehensive exclusion list that anticipates these gaps — combined with a bid delivery method that proves the GC reviewed those exclusions before accepting your price.

The Bottom Line

Scope gaps between trades are a predictable source of disputes on public works projects, and they almost always trace back to assumptions made during bidding that were never verified or documented. The subcontractor who clearly defines what is and is not in their scope, documents their assumptions about adjacent trades, and ensures the GC acknowledges those boundaries before award is the one who avoids absorbing costs that belong to someone else.

This is exactly why terms-first proposal workflows matter. When a GC must review and accept your scope narrative before seeing your price, scope boundaries become part of the conversation, not an afterthought. Platforms like [Kovered](https://kovered.app) enforce this sequence, ensuring both parties agree on what is included before pricing enters the picture.