What is the typical use of Level of Development (LOD) 300–400 in BIM?

• A. Design development and construction documentation.
• B. Schematic design only.
• C. As-built documentation.
• D. Conceptual sketches.

Answer: (D)

LOD 300–400 represents a model developed with enough precision and data to support design development through construction documentation and into fabrication. At this level, elements have defined size, shape, location, and interfaces, enabling accurate quantity takeoffs, cross‑discipline coordination, and the production of construction documents. As you move from 300 to 400, the model becomes progressively more fabrication-driven, with shop drawings and detailed assemblies suitable for fabrication and installation. Conceptual sketches and schematic design fall earlier in the process and lack the required precision and data, while as‑built models come later as record models reflecting built conditions. So, the typical use of 300–400 is to support design development and construction documentation, progressing toward fabrication details.