Introduction to LOD

Level of development (LOD) is a designer’s guide to correct detailing and information integration of Discipline models. It is a tool for agreeing on the development level of data models within a project. Therefore, LOD sheets must be defined in cooperation with the customer. LOD is a measure of how seriously you take the information represented by a BIM element. It is not necessarily a measure of the amount of information, although obviously there must be enough information to satisfy the specified LOD level. The LOD is divided into three measurable sections:

1.    Level of Information describing the information level (LOI)

2.    Level of Graphics describing the graphical detail and (LOG)

3.    Level of reliability dictation how accurate the data is. (LOR)​

LOR is not integrated in the materiel represented on this site yet.


General description of LOD levels

A general specification of the LOD levels has been made to support the individual description of eath dicipline model. The specific description for eath model will always overrule the general specification.

The specification defines the elements LOG and LOI. The levels are not fixed to any specific project phase, resulting in a flexible system where any LOD can be chosen to any given project phase. The highest LOI level specified in this release is LOI 300. If the LOG level doesn't have a corresponding LOI on the same level, the model must have an LOI cooesponding with the highest LOI level for that specific model.

The ICT of the induvidual project defines the LOD levels of the relevant models.

LOG 100

LOG 200

LOG 300

LOG 325

LOG 400

2D geometry represented as points, lines or polygons, or schematic diagram.


3D geometry where elements are generic placeholders.

They may be recognizable as the components they represent, or they may be volumes for space reservation

3D geometry represented as correct outer geometry.

They must be recognizable as the components they represent.

3D geometry represented with correct detailed outer geometry.

All details must be recognizable as the components they represent.

3D geometry where elements are modelled at sufficient detail and accuracy for fabrication of the represented component, including all related e​lements e.g. reinforcements, bolts and internal wiring.

LOI 100

LOI 200

LOI 300

LOI 325

LOI 400

DDA layers

Geometrical parameters e.g. radius, area

DDA layers

Geometrical parameters e.g. radius, area, volume​