At this level, elements are accurately modeled in terms of geometry, location, size, and orientation. The model is suitable for coordination and clash detection. LOD 300 is widely used for construction documentation and detailed design reviews.
LOD 350 – Construction Documentation
LOD 350 includes all the information from LOD 300, with bim modeling services added details about connections and interfaces between elements. This level is used to prepare shop drawings, perform coordination with multiple disciplines, and ensure accurate constructability.
LOD 400 – Fabrication and Assembly
This level is used for fabrication, with models containing detailed geometry and information required for manufacturing and installation. LOD 400 models support procurement, off-site prefabrication, and on-site assembly.
LOD 500 – As-Built
LOD 500 represents the final, constructed state of the project. It contains verified geometry, exact dimensions, and facility management data. The as-built model serves as a digital twin for building operations and maintenance.
Choosing the Right LOD for BIM Services
Not all projects require the highest LOD for every component. The appropriate LOD depends on:
Project stage: Early design phases typically use LOD 100–200, while construction phases need LOD 300–400.
End-use of the model: If the model is used for coordination or prefabrication, higher LODs are required.
Budget and timeline constraints: Higher LODs require more modeling effort and cost. Unnecessary detailing can waste time and resources.
Therefore, BIM service providers and clients should clearly define LOD requirements in the BIM Execution Plan (BEP) or Scope of Work (SOW) document.
Benefits of Defined LOD Requirements
Improved Quality Control: Ensures consistency in modeling standards across trades.
Risk Mitigation: Reduces misunderstandings and errors during construction.
Enhanced Collaboration: Teams can work together more effectively when everyone understands the expected level of detail.
Efficient Asset Management: Accurate as-built models help in long-term facility management.