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Part of Xbim; the eXtensible Building Information Modelling (BIM) Toolkit

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What is it?

The xBIM Tookit (eXtensible Building Information Modelling) is an open-source, software development BIM toolkit that supports the BuildingSmart Data Model (aka the Industry Foundation Classes IFC).

xBIM allows developers to read, create and view Building Information (BIM) Models in the IFC format. There is full support for geometric, topological operations and visualisation. In addition xBIM supports bi-directional translation between IFC and COBie formats

Getting Started

You will need Visual Studio 2013 or newer to compile the Solution. All solutions target .NET 4.0. The 4.0 Client profile may be supported for some projects. The roadmap expects to move to 4.5 versions of the .NET framework soon.

XbimEssentials is a software library to be used for the creation of complex applications, other repositories under the XbimTeam page include a number of example applications to demonstrate its capabilities

  • XbimXplorer - a Windows WPF sample application that can open and render 3D IFC models (and native XBIM models ) as well as displaying semantic data.
  • XbimWebUI - a web application that can open and render 3D IFC models.
  • XbimUtilities - a set of sample console applications to perform bulk functions on IFC files.
  • XbimExchange - Project containing libraries and sample application demonstrating various approaches to work with COBie. This includes Xbim.Cobie which represents spreadsheet view of the COBie model, implementation of CobieLite, Xbim.CobieLiteUK which is XML model inspired by CobieLite but more rigorous and memory efficient and CobieExpress as an EXPRESS based model representing COBie. XbimExchange contains sample code for conversions between IFC and various implementations of COBie.
  • HelloWall - a sample console application demonstrating how to undertake simple IFC creation with Xbim.

Please note: all the applications are provided to demonstrate how to use the Xbim library, they are not intended for use in uncontrolled production environments.


The XBIM library is made available under the CDDL Open Source licence. See the licences folder for a full text.

All licences should support the commercial usage of the XBIM system within a 'Larger Work', as long as you honour the licence agreements.

Third Party Licences

The core XBIM library makes use of the following 3rd party software packages, under their associated licences:

Additionally the Samples also make use of the following libraries

All licences are included in full under the Licences\3rd Party solution folder.


The toolkit uses the Nuget technology for the management of several required packages as well as for distributing the libraries. If you wish to use the development versions of xbim make sure to add our nuget feeds for the master and develop branches of the solution. Nuget can download all the required dependencies for you if you have the correct package source configuration.

if you use Visual Studio 2015+ add the following package sources:

if you use Visual Studio 2013+ add the following package sources:

the resulting configuration pages looks like this in VS2015: example of VS2015 configuration

Support & Help

Please use the community features of GitHub to ask any questions and raise issues.


The XbimTeam wishes to thank JetBrains for supporting the XbimToolkit project with free open source Resharper licenses.

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Getting Involved

If you'd like to get involved and contribute to this project, please contact the Project Coordinator @SteveLockley.


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