COBie 2.4 publication
The COBie module published as section 4.2 of NBIMS-US V3 is the primary source for the exchange concepts and requirements summarized here.
Open official publicationCOBie 2.4 standard
COBie 2.4 inside NBIMS-US V3.
COBie 2.4 is an information-exchange specification that can be expressed in multiple implementation formats. BIMRelay generates the spreadsheet implementation of COBie 2.4 documented in NBIMS-US V3, published by NIBS in 2015.
Annex A worksheet schemas
Annex A provides the worksheet-level schemas and field definitions for every COBie 2.4 sheet.
Open official Annex ABIMRelay implementation
BIMRelay generates COBie 2.4 XLSX workbooks and validates their structure and relationships.
See Revit-to-COBie workflowIndependent worksheet guide
Understand the complete workbook one worksheet at a time.
The reference explains each worksheet's purpose, relationships, project timing, Revit data sources, and practical quality checks, with links to the official documents throughout.
Open the COBie 2.4 referenceNormative source
BIMRelay summaries are educational and implementation-focused. Use the official NIBS documents and the applicable contract to determine normative requirements and acceptance.