Agent skill · data analytics · datadrivenconstruction
bim-cost-estimation-cwicr
Automated cost estimation from BIM models using DDC CWICR database (8 national bases, 78,228 positions). AI classification + vector search for accurate pricing.
Why this skill is useful
Adds an automated pipeline for cost estimation from BIM models using a proprietary database and AI classification, which the AI cannot generate on its own.
What it needs
Requires python3 installed locally. Requires openai, qdrant account access. About 6k tokens when loaded. Last updated 2026-02-14. 265 stars on the source repository.
What this skill does
BIM Cost Estimation with DDC CWICR Generate accurate cost estimates from BIM models using AI classification and the DDC CWICR construction cost database. Business Case Problem: Traditional cost estimation: Manual and time-consuming (weeks for detailed estimate) Subjective and inconsistent between estimators Requires specialized knowledge Difficult to update with design changes Solution: Automated BIM-to-cost pipeline: Extract quantities directly from model AI classifies elements to work items Vector search finds matching prices in CWICR Complete estimate in hours, not weeks ROI: 80% reduction in estimation time, consistent methodology System Architecture DDC CWICR Database Pipeline Stages Stage Name Description ------- ------ ------------- 0 Collect BIM Data Extract elements from Revit/IFC 1 Project Detection AI identifies project type 2 Phase Generation AI creates construction phases 3 Element Assignment AI maps types to phases 4 Work Decomposition AI breaks types into work items 5 Vector Search Find matching rates in CWICR 6 Unit Mapping Convert BIM units to rate units 7 Cost Calculation Qty × Unit Price 7.5 Validation CTO review for completeness 8 Aggregation Sum by phases and categories 9 Report Generation HTML and Excel outputs Python Implementation n8n Workflow See: n8n4CAD(BIM)CostEstimationPipeline4D5DwithDDCCWICR.json Output Example Resources CWICR Repository: https://github.com/datadrivenconstruction/OpenConstructionEstimate-DDC-CWICR Live Demo: https://openconstructionestimate.com Qdrant: https://qdrant.tech --- "Resource-based costing separates physical quantities from volatile prices, enabling transparent and auditable estimates."
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills datadrivenconstruction/bim-cost-estimation-cwicr