BIM Level 3 changes how information is created and managed between different parties in the project – customers, designers, contractors, managers, etc. Working according level 3 of BIM are uses a common data environment in which all project participants work according to the granted access rights.

Modeling tools have direct interface with a project in central storage. When sharing information, export and import operations are not performed, that is, file formats become not relevant. When changes or updates occur, they are synchronized with the central model.

Such a principle, developed model example is given in Fig 5.

Central model is created on the shared environment server for the designer of each part,

such as heating, ventilation and air conditioning, water supply and sewage, electrical engineering, creates local copies of the BIM model on computers. They have a relationship with the base model. When a designer changes or updates a model, it is possible to synchronize the changes with the central BIM model.

BIM 3 level – fully integrated and collaborative processes, clearly defined procedures, and responsibilities. One consistent digital information model that stores all the information generated during all stages of the SGC is created.

Specialists create a structure of central and local models that the specialists in each part of the project see the models of the other parts, but they cannot make adjustments. If the designer sees a problem, such as where the duct crosses part of the pipe, and if we want to adjust the duct adjustment, the designer can go directly through the system and send request for responsible person.

This allows to avoid losing information during data exchange. BIM software has the ability to connect to a central storage environment, review and save information, this ensures real-time collaboration and clear responsibilities of all project participants.

The purpose of BIM level 3 is to eliminate the exchange of information using a file structure. All data should be stored in databases. The developers of the BIM model will connect to the database using specialized tools and modify the content directly. Necessary protocols and procedures must be developed for this. BIM level 3 systems will have libraries with all the necessary product, installation information, which will be available by integrating manufacturers, BIM systems using services. These systems will include all Building Life Cycle processes, will integrate various technologies already mentioned BIM, GIS, AI, loT. Also will be developed Digital Twin, where we will have physical and integrated virtual reality.