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Get Started Free →datadrivenconstruction/n8n-cost-estimation
Build n8n pipeline for automated cost estimation from Revit/IFC using DDC CWICR database and LLM classification.
Passed 19 of 23 test cases with the skill, and 4 of 23 without it.
and 15 more in the full report
15 fixed4 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 15 test cases the skill fixed. Same model, same prompt, with and without the skill.
When generating the HTML estimate report in the n8n node, what default output filename should be specified in the returned JSON object?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies estimate_report.html as the output filename | Missed | Passed |
The instructions your model reads when the skill loads.
Traditional cost estimation requires:
Free open-source n8n pipeline that converts CAD (Revit 2015-2026) files into full cost and time estimates using AI (LLM) and vector database with 55,000+ work items.
| Traditional Role | Automated Alternative |
|---|---|
| BIM Manager manually exports data | Pipeline auto-classifies elements |
| Junior Estimator searches databases | Vector search finds matches in ms |
| Senior Estimator maps assemblies | LLM identifies quantity parameters |
| Foreman calculates labor hours | DDC CWICR contains documented norms |
| Project Manager aggregates costs | Pipeline outputs phased breakdown |
Processing speed: 3-10 seconds per element group
┌─────────────┐ ┌─────────────┐ ┌─────────────┐
│ Revit/IFC │───>│ CAD2DATA │───>│ Structured │
│ File │ │ Converter │ │ Excel/CSV │
└─────────────┘ └─────────────┘ └─────────────┘
│
▼
┌─────────────┐ ┌─────────────┐ ┌─────────────┐
│ Cost Report │<───│ Price Match │<───│ LLM Class. │
│ HTML/Excel │ │ DDC CWICR │ │ + QTO │
└─────────────┘ └─────────────┘ └─────────────┘
test cases passed, vs 4 / 23 without
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