How can project time and cost be forecast more effectively?
One approach is to use 4D and 5D BIM to extend the three-dimensional information model with additional project parameters. In 4D BIM, model elements are linked to schedules, activity sequences, and construction stages. 5D BIM adds quantities and cost information. This allows the BIM model to function not only as a spatial representation of the project, but also as a tool for planning and control.
With 4D and 5D BIM time and budget forecasting, project development can be visualized over time and connected with its financial parameters. Construction simulations make it possible to follow the progress of different activities and compare planned and actual schedules and costs.
The simulation also provides a clearer view of activity sequences and dependencies during construction. By connecting the model with quantities and financial information, project teams can evaluate alternatives, support budgeting, and better understand how changes in the schedule may affect project delivery.
The purpose of 4D and 5D BIM is to improve predictability throughout the construction process. It supports resource planning, time and cost monitoring, and a clearer understanding of how design decisions translate into project execution. Radi Karmazov of IPA’s BIM team explains how this approach is applied in practice.
