BIM maturity levels (0–3)

BIM maturity levels are a staged model, originally from the UK, describing how collaboratively and digitally information is produced, exchanged and managed — a progression from unmanaged CAD to integrated, open information sharing. The classic scale runs Level 0 to Level 3.

Level 0 is unmanaged CAD or paper exchange, with little collaboration. Level 1 is managed CAD with naming and data-structure standards and a common data environment, but still largely discipline-separated. Level 2 is federated discipline models coordinated through shared standards and a CDE — the collaborative model long associated with UK BIM practice. Level 3 is fully integrated, open collaboration, the "open BIM" end of the older narrative.

The model is usually traced to the Bew–Richards framework and was used to communicate a national roadmap from CAD toward collaborative BIM. Its status has shifted, though: ISO 19650 reframed the conversation away from numbered "maturity levels" toward information-management principles, information requirements and collaborative workflows. "Level 2" is now often a legacy shorthand for the ISO 19650 way of working rather than a current standard name — the old labels are still used in conversation, but they are no longer the primary framing. In Italian, livelli di maturità BIM is used mainly to refer to the UK legacy model, while ISO 19650 / UNI 11337 talk more about gestione informativa than numbered levels.