Level of Development (LOD) in BIM defines the degree of completeness, reliability, and detail of a model element at various stages of a project.
It helps project teams understand how much information a BIM element contains and how it can be used for design, construction, and facility management.

Each LOD represents a specific stage of model accuracy and data richness, ensuring that all stakeholders share the same expectations regarding model content and usability.

LOD 100 – PRE-DESIGN

• The element is represented graphically as a symbol or mass without precise geometry.
• Used for conceptual design and early project studies.
• Quantities, size, shape, and location are approximate.

LOD 200 – Schematic DESIGN

• The element is modeled with approximate geometry and generic information.
• Represents the general shape, size, and location.
• Used for design development and early coordination.
• Information may include system type or approximate quantities.

LOD 300 – DESIGN DEVELOPMENT

• The element has accurate geometry and location.
• Suitable for coordination, clash detection, and documentation.
• Quantities, dimensions, and positions are precise.
• Typically used for construction drawings and permit documentation.

LOD 350 – Construction Documentation

• The element includes interfaces and connections with other building components.
• Used to coordinate structural, mechanical, and architectural systems.
• Allows for more accurate construction sequencing and installation planning.

LOD 400 – CONSTRUCTION STAGE

• The element is modeled as it will be fabricated and installed.
• Contains detailed geometry, material specifications, and production data.
• Used by contractors and manufacturers for prefabrication and on-site construction.

LOD 500 – As-Built

• Represents the final, constructed condition of the element.
• Geometry and data match the actual built asset.
• Used for facility management and maintenance.

In Summary: