BIMForum 2023 LOD Specification

The BIMForum 2023 Level of Development (LOD) Specification is now open for public review and comments until the 15th January 2024.

The Level of Development (LOD) Specification is a reference that enables BIM practitioners in the AEC Industry to specify and articulate with a high level of clarity the content and reliability of project and/or asset information models at various stages in the design and construction process.

The LOD Specification defines and illustrates characteristics of model elements of different building systems at different Levels of Development. This clear articulation allows model authors to define what their models can be relied on for, and allows downstream users to clearly understand the usability and the limitations of models they are receiving.

The intent of this Specification is to help explain the LOD framework and standardise its use so that it becomes more useful as a communication tool. It does not prescribe what Levels of Development are to be reached at what point in a project but leaves the specification of the model progression to the user of this document.

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