Why consider converting from CAD to BIM? This topic remains under active discussion. What I propose here is transformation rather than outright replacement, as often described in the construction industry. The reason is that completely replacing one technology with another takes time and only happens when all conditions are favorable. From a domestic development perspective, BIM technology is still not ready to fully supplant CAD, so I use the term “conversion” instead. Below, I share my perspective.
BIM and CAD represent two fundamentally different architectural design approaches and documentation methods. CAD (Computer-Aided Design) applications replicate traditional design practices—essentially “Paper and Pen” in digital form. They create graphic elements such as lines, planes, and text from 2D electronic drawings. CAD drawings, much like traditional paper drawings, are created independently and lack interconnection. Consequently, when design changes occur, manual updates are required for each drawing separately. This lack of linkage means designers must painstakingly search and compare drawings bit by bit, which wastes time, increases workload, and raises costs.
This issue is especially problematic today, given the growing scale and complexity of building projects. The outdated process of manual modifications challenges the strict project schedules demanded by clients. Furthermore, CAD produces two-dimensional drawings, which can be difficult for clients to interpret—especially those with limited spatial imagination or technical knowledge. Projects typically include floor plans, elevations, top views, detailed drawings, and perspectives. However, these views make it hard for clients to fully understand the building’s interior. BIM technology addresses this by creating a comprehensive model that clearly presents the project to the owner, enhancing communication and fostering a fair collaborative environment.
BIM (Building Information Modeling), on the other hand, mimics the real construction process. Instead of relying on 2D line drawings, BIM is based on actual building elements such as walls, window frames, floors, and roofs. Architects and designers work within a centralized virtual building model where all data is stored. Design changes automatically update related drawings generated from the model. This integrated model approach not only greatly improves efficiency but also lays the foundation for better-coordinated design solutions and a streamlined computer-model-based building process.
Transitioning from CAD to BIM allows us to leverage these benefits throughout the design and construction phases, and the advantages of BIM are becoming increasingly evident.
In conclusion, while the shift from CAD to BIM is inevitable with advances in building information technology, it is not yet the right time for full replacement. It is important not to overestimate BIM’s capabilities or expect it to solve all the limitations of CAD immediately. Such misconceptions can lead to misunderstandings about the true purpose and value of BIM, which I hope to avoid.
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