Snag count at handover is one of the cleaner outcome metrics available for comparing coordination approaches on a real project, since it reflects the accumulated effect of design and construction coordination quality across the entire project lifecycle, rather than just one narrow phase or one specific discipline's performance.
| Coordination approach | Typical snags per 10,000 sqft at handover |
|---|---|
| Traditional 2D-coordinated project | 80 to 150 |
| BIM-coordinated project (LOD 300+, clash detection applied throughout) | 30 to 60 |
Why the Gap Reflects More Than Just Fewer Physical Clashes
BIM coordination reduces not just the physical clashes that create the most obviously visible snags, but also the ambiguity-driven errors - unclear detail interpretation, information gaps in drawing sets - that generate a genuinely large share of the finishes and fit-out snags typically found at handover, which traditional 2D coordination is structurally less equipped to catch than physical clashes specifically. Projects that additionally use digital punch list tracking throughout construction, rather than only at final handover inspection, tend to close snags earlier and considerably more thoroughly, compounding with BIM coordination's upstream benefit to produce the cleanest handover outcomes in the comparison.
A Scenario Showing Why Snag Count Is a Useful Internal Benchmark
Picture a firm that has delivered several projects using traditional 2D coordination, tracking a rough sense of typical handover snag counts across that body of work, and then delivers its first genuinely BIM-coordinated project. Comparing that new project's actual snag count against the firm's own historical baseline - rather than against an external industry figure that might not reflect this firm's specific project types and quality standards - gives a considerably more meaningful, apples-to-apples read on whether the coordination process change actually delivered the improvement it was meant to, using the firm's own track record as the most relevant comparison point available.
Why Severity Classification Matters as Much as Raw Count
Snag count alone is a useful headline metric, but it works best alongside severity classification - a project generating a larger raw snag count where every item is a minor cosmetic touch-up is genuinely in a different position than one with a smaller raw count where several snags are serious functional defects, and treating both projects as equivalent purely based on the raw number would miss this meaningful distinction.