What problem does it solve? Authoring and verifying BIM building data programmatically is difficult: IFC models are complex, and it is hard to confirm that generated geometry, quantities, and spatial structure are correct. This Skill provides a controlled workflow to build real IFC4 buildings, inspect their contents, and verify quantities against measured outputs. ## Core Features & Use Cases - IFC4 Building Authoring: Configure footprint, storeys, height, and room use, then run a build that produces a real IFC4 model with storeys, slabs, walls, spaces, and quantity sets using IfcOpenShell. - Model Inspection and Verification: Reopen the generated building.ifc, inspect spaces, walls, and openings, and match areas and volumes against quantities.csv. - Optional Blender/Bonsai Bridge: Connect to an existing Blender session through the pinned upstream integration for native Bonsai editing and read-back verification. - Use Case: An architect wants to prototype a three-storey office layout, generate the IFC model, and confirm that slab areas and space volumes match the intended program before handing the file to downstream BIM tools. ## Quick Start Ask the agent to build a two-storey office building with a 20 by 15 meter footprint and verify the resulting IFC spaces and quantities.