As-built BIM Models embedded with facility management related information such as maintenance schedules, product manuals etc are considered as 6D.
6D – BIM models are considered to be rich with full building information accurately depicting the built project.

Models when used for detailed cost-estimation of the project by incorporating the information specific to material volumes, cost per unit etc are considered to be 5D Models.
5D Models are used during the project planning through the construction process to manage the budget with visual and information rich value engineering process.

Models carrying information regarding the construction schedule incorporated into each building element in 3D are considered to be 4D-BIM Models.
4D–BIM Models are developed during the construction planning stage. These are used to simulate, analyze and develop the construction schedule.

3D – BIM models are developed during the deign phase of the project to help visualize and communicate the design intent representing the building geometry using accurate sizes.
These BIM Models are different from the traditional surface extrusion models. 3D-BIM Models are organized by real world building element categories such as walls, doors, windows etc.