Scope gaps at buyout: when a package is awarded low because something was left out
The buyout report says the mechanical package came in $310,000 under its GMP line. Everyone is pleased. Four months later a change order arrives for $260,000 of ductwork that the mechanical subcontractor says was never in its scope, and the drawings are ambiguous enough that nobody can prove otherwise. The saving was never a saving. It was a gap, and the gap was priced by the party that had the least reason to find it.
This is the most common way buyout results mislead an owner, and it is preventable, because the information needed to spot it exists at the moment of award. The owner just has to ask for it.
What a buyout variance is made of
When a package is awarded, the difference between the GMP line and the award price has one of four sources. The market moved: the estimate was made a year ago and prices fell. The estimate was conservative: the contractor carried a margin in the line and did not need it. Competition worked: five bidders instead of two. Or the scope shrank: the subcontract covers less than the GMP line was meant to cover, and the rest will be bought later, or will arrive as a change.
The first three are real savings and go into the pool. The fourth is not a saving at all. From the buyout log alone the four are indistinguishable. A line that says $2.1 million estimated, $1.79 million awarded, variance $310,000, is silent about why.
The scope comparison
The document that tells them apart is the scope comparison the contractor prepares before award: the bid form, the bidder's list of inclusions and exclusions, and the contractor's own reconciliation of those against the GMP line. Every competent contractor prepares this. Not every contractor sends it to the owner, and not every owner asks.
For a fictional $2.1 million mechanical line, the comparison might show that the low bidder excluded the rooftop unit curbs, the controls integration and the commissioning support, and that the contractor plans to buy those separately for around $180,000. The true variance on the package is then $130,000, not $310,000, and the $180,000 is a commitment the buyout log should carry against the same line until it is bought.
Exclusions that are not priced at all
The dangerous exclusions are the ones with no plan behind them. A bidder that excludes the seismic bracing because the drawings do not show it has identified a design gap, and the contractor who accepts that bid and awards low has moved the gap from the estimate to the change order register without telling anyone. The owner who reads the exclusion list at award can ask the question then, when the answer costs the price of a bracing subcontract, instead of at month nine, when it costs that plus a delay.
Recording it against the line
The ledger entry for an awarded package should carry the GMP line value, the award value, and any scope carried out of the award with its expected cost. The variance the owner counts as a saving is the award plus the carried scope against the line, not the award alone. When the carried scope is bought, the entry is updated and the variance settles. When it arrives as a change order instead, the change order references the package and the cause is recorded as a scope gap at buyout, which is a contractor risk under most contracts and does not raise the GMP.
That last point is the reason to keep the record. A contractor who awarded low and is now presenting the gap as an unforeseen condition or a design change is asking the owner to pay for an estimating decision. The owner with the exclusion list from the award can answer. The owner without it is negotiating from memory.
The pattern across packages
One gap is a mistake. A pattern is a method. On a fictional $47 million project with twenty six trade packages, if the eight largest all came in under their lines and six of the eight carry exclusions that were later bought or changed, the buyout report is telling a story about the estimate, not about the market. The savings pool the contractor is projecting from those variances will not survive closeout, and the anticipated final cost should say so before the board hears the good news.
What to do this month
- Ask for the bid comparison and the exclusion list with every award notice, not after.
- Record each award with the GMP line, the award price and the carried scope with an expected cost.
- Count the variance net of carried scope, and update it when the carried scope is bought.
- When a change order cites a package, check its exclusion list before accepting the cause.
Questions on this
Is a package bought under its line always a saving?
No. The variance is a saving only if the award covers the whole scope the line was meant to cover. Exclusions that will be bought separately or arrive as changes reduce it, sometimes to nothing.
Who pays for a scope gap found after award?
Under most GMP contracts a gap between the subcontract and the GMP scope is a contractor risk, paid from contractor contingency and not from the owner. The record of the award is what makes that argument.
Should the owner see every bid?
The owner rarely needs the bids themselves. The bid comparison and the exclusion list are enough, and most contracts give the owner the right to them. Ask at award, when the question is cheap.
In the product
Buyout tracker, Change order register, Shared savings. Free tool: Change Order Exposure.
Keep reading
Earlier: A notice calendar built from the change order register, not from memory. Later: Reporting a bad month: how to put an overrun in front of the board. All articles on buyout and shared savings.
See the baseline on a contract like yours.
Thirty minutes on a call. We read a fictional GMP amendment into the baseline and show what the basis flags reveal.