Scope gaps aren't random — they cluster around predictable places. Knowing where they tend to hide is the difference between catching them during leveling and discovering them as change orders. Across project types, the same categories of gap recur, almost always at the boundaries between trades or in items that every sub assumes someone else is covering.
Trade Interface Gaps
The most common and most expensive gaps live where trades meet. Electrical connections to mechanical equipment — rooftop units, pumps, controls — frequently appear in neither the electrical nor the mechanical bid because each sub assumes the other has it. Equipment pads, housekeeping pads, and curbs fall between concrete, mechanical, and structural. Fire-stopping and penetration sealing at wall and floor assemblies fall between the trades that create the penetrations and the one that should seal them.
Commonly Excluded Items
Some items are excluded so routinely that GCs learn to look for them: insulation on ductwork and piping, controls integration and commissioning, temporary protection, hoisting and rigging of large equipment, and as-built documentation. A bid that's silent on these isn't necessarily including them — silence usually means exclusion, and that's a gap until proven otherwise.
The Quantity Gap
A subtler gap is the quantity assumption. A sub prices the scope correctly but bases it on a quantity lower than the plans require — fewer fixtures, less linear footage, a smaller area. The line item is present, so it doesn't look like a gap, but the under-quantity creates the same post-award cost surprise. The AI agent flags both missing items and quantity divergences against the documents. It's demonstrated at omnionlinestrategies.com/ai-agent-construction-bid-leveling.