The Level of Development (LOD) is a reference that allows specialists in the AEC Industry to specify and articulate through a high level of clarity the content and reliability of Building Information Models (BIMs) at various stages in the design and construction process.
LOD: 100 (Pre-Design)
Represents a conceptual model where overall building mass is indicative of area, height, volume, location and orientation that may be 3D modeled or represented by other data.
LOD: 200 (Schematic Design)
Model is represented as a generic system, object or assembly with approximate quantities, size, shape, location and orientation. Here non graphic information may also be attached to the model.
LOD: 300 (Design Development)
Accurate modeling and shop drawings where elements are defined with specific assemblies, precise quantity, size, shape, location and orientation. Here too we can attach non- geometric information to the model elements.
LOD 350 (Construction Documents)
Includes model detail and element that represent how building elements interface with various systems and other building elements with graphics and written definitions.
LOD 400: (Construction Stage)
Model elements are modeled as specific system, object or assemblies, with complete fabrication, assembly, and detailing information in addition to precise quantity, size, shape, location and orientation. Non- geometric information to the model elements can also be attached.
- LOD: 500 (As-Built)
Elements are modeled as constructed assemblies for Maintenance and operations. Non-geometric information may be attached to modeled elements.