Level of Development
If your organization is requesting BIM as-built documentation, it will be useful to determine the required level of information using the LOD (Level of Development) method below, and request this from our team.
Our Standard LOD Precision
Our deliverables typically feature LOD 300 level of development unless otherwise requested. This includes symbolic designation of items and elements, with correct dimensional location, quantity, size, shape and orientation.
History of the Industry LOD
LOD was first introduced by the American Institute of Architects (AIA) in 2008 when it defined five different levels of development to define the detailing levels in a BIM model.
LOD specifications inform the project engineers and designers how much they can rely on details in the Building Information Model. This information allows them to communicate with other team members about the usability and limitations of the model.
Graphic Representation of BIM LOD’s
Image source: https://www.bimandco.com/bim/learn-more/levels-of-detail-lod/
Image source: https://www.researchgate.net/publication/349090930_3D-Modeling_for_Life_Cycle_of_the_Structure
LOD Scale from LOD-100 to LOD-500
LOD 100 – Concept Design
A conceptual model where parameters like area, height, volume, location and orientation are defined.
LOD 200 – General Modeling with Schematic Design
A general model where elements are modeled with approximate quantities, size, shape, location and orientation. Non-geometric elements can be embedded with model elements at LOD 200.
LOD 300 – Accurate Modeling and Detailed Design
Accurate modeling and shop drawings where elements are defined with specific assemblies, precise quantity, size, shape, location and orientation. Non-geometric elements can be embedded with model elements at LOD 300.
LOD 350 – Greater Detail and Construction Documentation
It includes more detail and elements that represent building elements interface with various building systems and other elements with clear graphics and written definitions.
LOD 400 – Fabrication and Assembly
Model elements are modeled as specific assemblies, with complete fabrication, assembly and detailed information in addition to precise quantity, size, shape, location and orientation. Non-geometric elements can be embedded with model elements at LOD 400.
LOD 500 – As-Built Models
Elements are modeled as constructed assemblies for operations and maintenance. In addition to actual and accurate in size, shape, location, quantity and orientation, non-geometric elements can be embedded with model elements at LOD 500.