Documentations

The IFC specification is available at the following locations for online use or for download.

Version	online access	download
IFC 1.5.1 *	IFC 1.5.1 Object Model Reference
IFC 2.0 *	IFC 2.0 Object Model Reference
IFC 2x **	IFC 2x Specification
IFC 2x Add 1	IFC 2x Addendum 1 Specification
IFC 2x2 ***	IFC 2x Edition 2 (IFC 2x2) Specification
IFC 2x2 Add 1	IFC 2x2 Addendum 1 Specification
IFC 2x3	IFC 2x Edition 3 (IFC 2x3) Specification	select download
IFC 2x3 TC1 x	IFC 2x Edition 3 Technical Corrigendum 1 (IFC 2x3 TC1) Specification	download registration
IFC4 Final	Industry Foundation Classes Release 2x4 (IFC4) Release Candidate 3 Specification	download registration
IFC4 Add1	Industry Foundation Classes Release 2x4 (IFC4) IFC4 - Addendum 1 (Final Standard) Specification	download registration

 Note
 *   out of date - these releases are not any longer supported
 **  out of date - for IFC2x exchange use the IFC2x Add 1 instead, for new implementations go directly to IFC2x3
 *** out of date - for IFC2x2 exchange use the IFC2x2 Add 1 instead, for new implementations go directly to IFC2x3
 x   documentation and consistency rule update of IFC2x3