ifc-qto-extraction
Extract quantities from IFC/Revit models for quantity takeoff. Uses DDC converters to get element counts, areas, volumes, lengths with grouping and reporting.
Install via CLI (Recommended)
clawhub install openclaw/skills/skills/datadrivenconstruction/ifc-qto-extractionIFC Quantity Takeoff Extraction
Extract structured quantity data from BIM models (IFC, Revit) for cost estimation, material ordering, and progress tracking.
Business Case
Problem: Manual quantity takeoff is:
- Time-consuming (40-80 hours for medium project)
- Error-prone (human counting mistakes)
- Not repeatable (changes require full rework)
- Disconnected from design (no live updates)
Solution: Automated QTO from BIM that:
- Extracts all quantities in minutes
- Groups by type, level, zone
- Updates instantly with model changes
- Exports to Excel for pricing
ROI: 90% reduction in QTO time, near-zero counting errors
DDC Tools Used
┌──────────────────────────────────────────────────────────────────────┐
│ QTO EXTRACTION PIPELINE │
├──────────────────────────────────────────────────────────────────────┤
│ │
│ INPUT CONVERT ANALYZE │
│ ┌─────────┐ ┌─────────┐ ┌─────────┐ │
│ │ .rvt │ │ DDC │ │ Python │ │
│ │ .ifc │─────────►│Converter│───────────►│ pandas │ │
│ │ .dwg │ │ │ │ │ │
│ └─────────┘ └─────────┘ └─────────┘ │
│ │ │ │
│ ▼ ▼ │
│ ┌─────────┐ ┌─────────┐ │
│ │ .xlsx │ │ Grouped │ │
│ │ raw data│ │ QTO │ │
│ └─────────┘ └─────────┘ │
│ │ │
│ OUTPUT ▼ │
│ ┌─────────────────────────────────────────────────────────────┐ │
│ │ QTO Report │ │
│ │ • Element counts by type │ │
│ │ • Areas (m², ft²) │ │
│ │ • Volumes (m³, ft³) │ │
│ │ • Lengths (m, ft) │ │
│ │ • Weights (kg, tons) │ │
│ │ • Grouped by level/zone/system │ │
│ └─────────────────────────────────────────────────────────────┘ │
│ │
└──────────────────────────────────────────────────────────────────────┘
CLI Commands
Revit to Excel (with BBox for volumes)
# Basic extraction
RvtExporter.exe "C:\Models\Building.rvt"
# Full ext...
Metadata
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Find the right skillPaste this into your clawhub.json to enable this plugin.
{
"plugins": {
"official-datadrivenconstruction-ifc-qto-extraction": {
"enabled": true,
"auto_update": true
}
}
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