2. LOD reference — what each level means

LODProject phaseModel contentPrimary use
LOD 100Pre-designConceptual massing, approximate areaSpace planning, early feasibility
LOD 200Schematic designApproximate geometry, system locationsDesign coordination, cost estimates
LOD 300Design developmentPrecise geometry, quantities, specificationsConstruction documents, clash detection
LOD 350ConstructionConnection details, interface geometryTrade coordination, subcontractor review
LOD 400Construction / fabFabrication-ready geometry and dataShop drawings, prefabrication, sequencing
LOD 500Handover / O&MVerified as-built + full asset dataFacility management, O&M, FM handover

3. LOD vs LOI — a distinction worth adding

LevelInformation attachedPrimary use
LOD 300System type, manufacturer class, nominal sizeCoordination and procurement planning
LOD 400Model number, submittal reference, installation notesFabrication, shop drawing production
LOD 500 (LOI)Asset tag, serial number, warranty, O&M manual link, maintenance scheduleFM system integration, lifecycle management