What Is BIM Modeling? Complete Guide to BIM, LOD & Deliverables
What Is BIM Modeling?
A Complete Guide to BIM, LOD, Deliverables & Applications
BIM modeling is the process of creating and managing a digital, information-rich representation of a building or infrastructure project. Unlike traditional 2D CAD drawings, a BIM model combines 3D geometry with information such as materials, dimensions, specifications, quantities, and relationships between building elements.
BIM helps architects, engineers, contractors, and owners coordinate project information throughout the building lifecycle.
What Is BIM Modeling?
BIM stands for Building Information Modeling. It is more than simply creating a 3D model. BIM combines geometry, information, relationships, documentation, and data within a structured digital model.
BIM modeling can include:
Architectural elements such as walls, floors, roofs, doors, and windows
Structural elements such as foundations, columns, beams, and slabs
MEP systems such as HVAC, plumbing, electrical, and fire protection
Rooms, spaces, equipment, and building components
Materials, specifications, quantities, and other project information
BIM models can also be used to produce coordinated drawings, schedules, quantities, and other project deliverables.
BIM Modeling vs. CAD
BIM and CAD are both widely used in the AEC industry, but they use different approaches.
BIM | CAD |
Information-rich building model | Primarily drawing-based |
Intelligent building elements | Lines, arcs, and basic geometry |
Model-based documentation | Drawing-based documentation |
Supports schedules and quantities | More manual data extraction |
Supports multidisciplinary coordination | Limited model coordination |
Can support the building lifecycle | Mainly design and documentation |
In simple terms, CAD represents drawings, while BIM represents building information.
BIM therefore provides a more connected approach to design, documentation, coordination, and information management.
What Is LOD in BIM?
LOD stands for Level of Development. It describes the development and reliability of information represented by BIM model elements for a specific project purpose.
Common LOD stages include:
LOD 100 — Conceptual
Used for early-stage conceptual design and general project representation.
LOD 200 — Approximate
Elements have approximate size, location, quantity, and other basic information.
LOD 300 — Detailed Design
Elements are modeled with accurate geometry and information suitable for design documentation.
LOD 350 — Coordination
Includes information needed to coordinate elements with other building systems and construction interfaces.
LOD 400 — Fabrication
Provides information suitable for fabrication and installation.
LOD 500 — Verified Existing / As-Built
Represents verified conditions of an existing or constructed asset.
Important: LOD is not simply about adding more 3D detail. It also relates to the intended use, development, and reliability of model information.
BIM Modeling Deliverables
BIM deliverables depend on the project scope, client requirements, BIM Execution Plan (BEP), and required level of development.
Typical deliverables may include:
BIM Models
Architectural BIM models
Structural BIM models
MEP BIM models
Coordination models
Federated models
As-built models
Drawings & Documentation
Floor plans
Roof plans
Elevations
Sections
Enlarged plans
Construction details
Schedules
Coordination Deliverables
Clash detection reports
Coordination views
Model review information
Issue reports
Data Deliverables
Quantities
Model parameters
Asset information
IFC and other required data exports
Applications of BIM Modeling
BIM can be applied across different stages of an AEC project.
Architectural Design
BIM supports design development, visualization, documentation, and coordination of architectural elements.
BIM Coordination
Architectural, structural, and MEP models can be coordinated to identify potential conflicts before construction.
Clash Detection
BIM coordination tools can help identify conflicts between building systems and support issue resolution before construction.
Quantity Takeoff
Information contained in BIM models can support quantity extraction and project estimation workflows.
Construction
Contractors can use BIM models for construction coordination, constructability review, sequencing, and communication.
Scan-to-BIM
Laser scans and point-cloud data can be used to develop BIM models of existing buildings.
Facility Management
BIM information can support building operation, maintenance, asset management, and future renovation activities.
Benefits of BIM Modeling
BIM can provide several benefits throughout the project lifecycle:
Improved multidisciplinary coordination
Better design visualization
More consistent project documentation
Earlier identification of potential conflicts
Improved communication between project teams
Better access to structured project information
Support for quantity and data extraction
Improved construction coordination
Better information for facility management
The actual benefits depend on the project's scope, BIM standards, model quality, and implementation process.
BIM and Digital Twin
BIM and Digital Twin are related, but they are not the same thing. A BIM model primarily represents a building and its associated information.
A Digital Twin can connect a digital representation of an asset with real-world operational information, sensors, systems, and performance data.
Therefore, BIM can provide an important foundation for a Digital Twin, but a BIM model is not automatically a Digital Twin.
Frequently Asked Questions About BIM Modeling
What is BIM modeling?
BIM modeling is the process of creating a digital building model that combines 3D geometry with structured information about building elements, materials, systems, quantities, and specifications.
Is BIM the same as 3D modeling?
No. 3D modeling primarily represents geometry, while BIM combines geometry with structured information and relationships between building elements.
What is the difference between BIM and CAD?
CAD is primarily used for creating drawings and geometric representations, while BIM uses intelligent building elements containing geometry and information.
What is LOD in BIM?
LOD means Level of Development. It describes the development and reliability of information represented by BIM model elements for a specific project purpose.
What are BIM deliverables?
BIM deliverables may include BIM models, drawings, schedules, quantities, coordination models, clash reports, and data exports depending on project requirements.
Is Revit a BIM software?
Yes. Autodesk Revit is a BIM authoring platform used for architectural, structural, and MEP modeling, documentation, coordination, and information management.
What is BIM coordination?
BIM coordination is the process of coordinating different building disciplines and identifying potential conflicts between architectural, structural, and MEP systems.
What is the difference between BIM and a Digital Twin?
BIM primarily represents building geometry and information, while a Digital Twin can connect a digital asset representation with real-world operational data and systems.
BIM Modeling Services by SDC Studio
At SDC Studio, we provide BIM-focused solutions that support architects, engineers, contractors, developers, and AEC project teams.
Our capabilities include:
BIM Modeling
Architectural BIM Modeling
Revit Modeling
BIM Coordination
Construction Documentation
Scan-to-BIM
BIM Automation
Dynamo and Revit Automation
Digital Twin and BIM-related solutions
We focus on developing accurate, coordinated, and project-specific BIM deliverables based on client requirements and project standards.
Ready to improve your BIM workflow?
📩 Contact SDC Studio to discuss your BIM modeling, coordination, documentation, or automation requirements.
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