According to the UK BIM Task Group (Bew and Richards, 2008), there are four BIM maturity levels.
| Level |
Description |
| Level 0 |
- Based on 2D CAD and the exchange of paper-based drawings.
|
| Level 1 |
- Partial 3D modeling of the facility (mostly for complex geometries) while most of the design is still realized by means of 2D drawings.
- Data exchange is realized through sending and receiving individual files, and a central project platform is not employed.
|
| Level 2 |
- Defined by the use of BIM software products for authoring digital building models, however, each of the various disciplines involved develops its own model.
- Their mutual consistency is ensured by periodic coordination sessions, where the individual sub-models are brought together and checked for clashes or other discrepancies.
|
| Level 2 |
- 2D drawings are mostly derived from BIM models.
- Data exchange is still realized on the basis of files (in native formats), however, all files are managed on a central platform.
- For handing over BIM models comprising both 3D geometry and semantics, open standards are not demanded on BIM Level 2. Instead, proprietary formats may be used.
|
| Level 3 |
- Based on the concept of a fully integrated BIM.
- It is based on the implementation of BIG Open BIM, i.e. ISO standards are employed for data exchange and process descriptions, and deeply integrated digital models are used throughout the entire lifecycle.
- Cloud services are used for managing project data so that data is continuously and consistently maintained over the building’s life cycle.
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