I’ve discussed before What is BIM model accuracy? However, many still have questions about model accuracy. Today, let’s explore What does BIM model accuracy represent? And the classification of component levels.
LOD 100: Represents the overall building volume with basic information such as area, height, volume, position, and orientation. These can be expressed in 3D models or other data formats. Components may be represented by symbols or generic images but do not need to meet LOD 200 requirements. Related data like cost per square foot or HVAC tonnage can be derived from other components.
LOD 200: Model elements are generalized systems, objects, or assemblies that provide approximate quantities, sizes, shapes, positions, and orientations. These are visually represented in the model, with non-visual information also attachable.
LOD 300: Components become more specific, containing precise information on quantities, sizes, shapes, positions, and orientations. Both visual and non-visual data are included.
LOD 350: Components represent specific systems or assemblies with exact quantities, sizes, shapes, orientations, and detailed interface information integrated with other systems. Visual and non-visual data are included.
LOD 400: Components include precise data necessary for complete manufacturing, assembly, and detailed construction, covering quantities, sizes, shapes, positions, and orientations, along with visual and non-visual information.
LOD 500: Represents as-built components with actual finished dimensions, shapes, positions, quantities, and orientations, including both visual and non-visual data.
What does BIM model accuracy represent? Classification of component levels.
Classification Details of LOD Levels
Structural Engineering
Fundamentals – Standard Fundamentals (LOD 200)
- Must be defined as a structural object.
- Must include the material name.
- Detailed components that do not affect collision analysis can be ignored unless specified.
Fundamentals – Special Fundamentals (LOD 200)
Foundation – Steel Sheet Pile (LOD 200)
Underground Structure:
- Column (LOD 200)
- Beam (LOD 200)
- Slab (LOD 200)
- Wall (LOD 200)
- Ladder (LOD 200)
- Ramp (LOD 200)
- Other (LOD 200)
Ground Structure:
- Column (LOD 200)
- Must be defined as a structural object.
- Must include the material name.
- For steel or steel-reinforced concrete structures, a separate structural BIM component must be established and cannot rely solely on external forms.
- Beam (LOD 200)
- Board (LOD 200)
- Must be defined as a structural object.
- Must include the material name.
- Detailed components that do not affect collision analysis can be ignored unless otherwise specified.
- Wall (LOD 200)
- Ladder (LOD 200)
- Above ground structure – Roof (LOD 200)
Indoor Door and Window Engineering
Door (LOD 200)
- Must include door and window size definitions and door components.
- Must include door handles.
- Hinges, locks, or dampers may be ignored unless specified.
Window (LOD 200)
Exterior Wall Engineering
External Wall (including doors and windows) (LOD 300)
- Dimensions and division positions must be based on architectural drawings.
- Detailed components may be ignored unless special requirements exist.
- External wall components must connect to ceilings, floors, and other parts.
Decoration Engineering
Ceiling Decoration (LOD 300)
- Must be defined as a structural object.
- Must include the material name.
- Detailed components that do not affect collision analysis can be ignored unless specified.
- Model color and similar factors are not included in acceptance unless specified by the owner.
Floor Decoration (LOD 300)
Wall Decoration (LOD 300)
Mechanical Engineering
Conveyor – Elevator (LOD 300)
- Components not affecting collision analysis can be simplified unless specified.
Conveyor – Parking Equipment (LOD 300)
Hydropower Project
Water Supply and Drainage – Components (LOD 300)
- Pipeline and equipment setup based on system upgrade diagrams.
- Pipeline sizes and specifications must match actual construction.
- External wall pipeline connections need to be constructed.
- Components not affecting collision analysis can be simplified unless specified.
- Non-critical hanging facility components may be ignored unless specified.
Water Supply and Drainage – Sewage (Sanitation) Pipeline (LOD 300)
Water Supply and Drainage – Rainwater Pipeline (LOD 300)
Water Supply and Drainage – Other Systems (LOD 300)
Water Supply and Drainage – Sanitary Equipment (LOD 300)
- Sanitary facility setup must include at least the location of water inlet and outlet connections.
Electricity – Lighting Fixtures (LOD 300)
- Pipeline and equipment setup based on system upgrade diagrams.
- Pipeline and box sizes and specifications must match actual construction.
- Components not affecting collision analysis can be simplified unless specified.
- Non-critical hanging facility components may be ignored unless specified.
Electricity – Weak Current (LOD 300)
Electricity – Pipeline (LOD 300)
Electricity – Box (LOD 300)
Power – Switch (LOD 300)
- Switch and socket positions must be established.
- Connecting parts may be simplified if part of concealed wiring.
Firefighting – Equipment (LOD 300)
- Pipeline and equipment setup based on system upgrade diagrams.
- Pipeline sizes and specifications must match actual construction.
- External wall pipeline connections need to be constructed.
- Components not affecting collision analysis can be simplified unless specified.
- Non-critical hanging facility components may be ignored unless specified.
Firefighting – Pipeline (LOD 300)
Air Conditioning Engineering
Air Conditioning – Main Room and Unit (LOD 200)
Air Conditioning – Duct System (LOD 300)
Air Conditioning – Plumbing System (LOD 300)
Air Conditioning – Refrigerant Pipe System (LOD 300)
Air Conditioning – Multi-Link Variable Frequency Outdoor Unit and Refrigerant Pipeline Duct Configuration (LOD 300)
That concludes our discussion on What does BIM model accuracy represent? Classification of component levels. I hope this article helps everyone!
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