The BIM model serves as the core carrier of BIM technology. Unlike traditional CAD drawings, BIM models contain a wealth of data and parameters. But does this mean that the model must be built with the highest level of detail right from the start of the project? Today, I will discuss the specific requirements for BIM models at various stages of a project.
Before diving in, I want to mention that during the detailed design phase, I have broken down these requirements further. As you may know, I won’t go into the detailed reasoning here. If you’re interested, you can refer to my previous article titled What is the accuracy of BIM models? How is LOD classified into levels? for a comprehensive explanation.
1. Requirements for BIM Models During the Planning Phase
The LOD 100 model elements can be represented using symbols or other general graphical forms. However, they are not required to meet the specifications of LOD 200. Information related to model components can be sourced from other model elements.
2. Requirements for BIM Models in the Preliminary Design Phase
At LOD 200, model components are graphically depicted as generic systems, objects, or assemblies within the model, showing approximate quantities, sizes, shapes, positions, and orientations.
3. Requirements for BIM Models in Detailed Design (Part 1)
LOD 300 model components are represented graphically as specific systems, objects, or assemblies in the model, based on accurate quantity, size, shape, position, and orientation.
4. Requirements for BIM Models in Detailed Design (Part 2)
LOD 350 model components are shown graphically as specific systems, objects, or components, incorporating not only quantity, size, shape, position, and orientation but also interfaces with other building systems.
5. Requirements for BIM Models During the Construction Phase
LOD 400 model components are detailed graphical representations of specific systems, objects, or components, including size, shape, position, quantity, and orientation. They also encompass detailed drawings, manufacturing, assembly, and installation information.
6. Requirements for BIM Models During the Completion Phase
LOD 500 model components represent constructed assemblies with precise details such as actual quantity, size, shape, position, and orientation. Additionally, non-geometric attribute information can be integrated into the model components.
From the above, it is clear that BIM model requirements vary throughout the different stages of a project. Starting with an excessively detailed model is not always advantageous—it can increase costs and add unnecessary complexity to subsequent stages.
That concludes our overview of the specific requirements for BIM models at various project stages. I hope this article has been helpful to you!
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