Not all clashes are equal. A structural column through a mechanical duct and a data cable tray within 10mm of a lighting fitting require fundamentally different responses at different timescales. Clash prioritisation is the coordination skill that determines which issues must be resolved this week and which can wait until next month.
Why This Matters
Treating all clashes as equally urgent is the fastest way to paralysed coordination. Teams that have no prioritisation framework spend coordination meeting time on minor clearance issues while hard structural clashes with long lead-time equipment remain unresolved.
Practical Guidance
Severity Levels: Define at least three severity levels: Critical (hard clash affecting structural or primary MEP systems, must resolve before design freeze), Major (coordination clash affecting system functionality or access, must resolve before construction issue), Minor (clearance or aesthetic clash, can carry to site instruction if needed).
Structural Priority: All clashes involving structural elements — columns, beams, slabs, load-bearing walls — are automatically Critical regardless of the other element involved. Structural geometry changes have programme and cost implications for multiple disciplines.
Long Lead-Time Equipment: Clashes involving long lead-time equipment (AHUs, chillers, transformer bays, MRI rooms) must be resolved before procurement. A clash discovered after equipment is on order may require expensive equipment repositioning or building element redesign.
Clearance vs Hard Clash: Distinguish between hard clashes (geometry intersection) and clearance clashes (insufficient maintenance space). Hard clashes must be resolved; clearance clashes are prioritised by the consequence of inadequate access. A valve in a sealed ceiling is more critical than a cable tray 40mm too close to a duct.
Checklist
- Define severity levels in BIM Execution Plan before first coordination run
- Mark all structural-involvement clashes as Critical automatically
- Identify long lead-time equipment and flag related clashes for priority resolution
- Separate hard clash and clearance clash lists in coordination reports
LUA BIM LABS Insight
Clash prioritisation is an engineering judgement, not a software setting — define the rules before coordination starts so the team agrees on what matters most.
LUA BIM LABS — Products & Services
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BIM Command Center for Revit (Add-in)
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