1. This PPT explains what is Level of Detail (LOD) and its importance in Revit modeling.|

2. What is LOD ?
Concept(Presentation)
Design Development
Documentation
Construction
Facilities Management
Level of Detail or Level of Development is a measure of the amount of information provided. As one progresses through the LOD, higher the number more is the details defined for an item. The items properties are objective in nature and are hence specific in nature.
Example: LOD levels for a chair might go:
LOD 100 = there is a chair
LOD 200 = there is a chair that has nominal space requirement of 500x500
LOD 300 = there is a chair with arm rests and wheels
LOD 400 = manufacturer and model number
LOD 500 = manufacturer and model number, supplier, date purchased |

3. 100 200 300 400 Conceptual Generic Placeholders Specific Assemblies
The Model Element the Model with a symbol or other generic representation, but does not satisfy the requirements for LOD 200. Information related to the Model Element ( i.e. cost per square foot, tonnage of HVAC, etc.) can be derived from other Model Elements.
Conceptual
100
The Model Element is graphically represented within the Model as a generic system, object, or assembly with approximate quantities, size, shape, location, and orientation. Non-graphic information may also be attached to the Model Element.
Generic Placeholders
200
The Model Element is graphically represented within the Model as specific system, object or assembly in terms of quantity, size, shape, location, and orientation. Non-graphic information may also be attached to the Model Element.
Specific Assemblies
300
Detailed Assemblies
The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of size, shape, location, quantity, and orientation with detailing, fabrication, assembly, and installation information. Non-graphic information may also be attached to the Model Element.
400 |

4. LOD Example LOD 100 LOD 400 Conceptual Details LOD 200 LOD 300 Generic
Placeholders
LOD 300
Specific
Assemblies
LOD 100
Conceptual
LOD 400
Details |

5. The LOD “Language” The LOD “Language” 4 “BUILD IT” “ESTIMATE IT” 1 3
DETAILED
COMPONENTS
“BUILD IT” 4
LOD 100
MASSING
“ESTIMATE IT” 1
LOD 350
ACTUAL
ASSEMBLIES
“BUY IT”
LOD 300
SPECIFIED
ASSEMBLIES
“BID IT” 3
The LOD
“Language”
LOD 200
GENERIC
ASSEMBLIES
“SPECIFY IT” 2 |

6. How do you use the LOD Spec?
100
200
300
350
400
100 = Cost assumption or simple object (light fixture)
200 = Generic type (pendant)
300 = Design specified, lamping/lumens, preferred model
350 = Actual model, Nuvo Lighting
400 = All mounting / installation detail |

7. Applying LOD Facade |

8. Applying LOD Structure
With the examples we have seen, we understood that the Level Of Detail (LOD) is a measure of the amount of information provided within the Revit model. Each and every element modeled can be detailed to an extent which can be up to LOD 500. The example below shows how LOD can be applied for detailed structural modeling.
Recap
Applying LOD Structure
LOD 100
LOD 200
LOD 300 |

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