The American Institute of Architects (AIA) initially introduced five levels of development to define the amount of detail in a BIM model in 2008. To further streamline implementation across building components, BimForumRD interpreted and expanded these levels, resulting in the publication of the Six Levels of Development in 2013. These levels provide a clear understanding of the information and functions associated with the different stages of a project.

Now, let's delve into each level and its importance in BIM:

LOD 100 (Concept)

At this level, model elements are represented graphically using generic shapes and symbols. The emphasis is on understanding the design and spatial requirements. For example, spatial objects are modelled based on the surface requirements of the project. LOD100 helps design teams to effectively communicate their conceptual ideas and spatial needs.

LOD 200 (Approximate Geometry)

In LOD200, model elements are represented graphically with approximate specifications, quantities, sizes, shapes, locations and orientations. It provides a more detailed representation of space by including bounding elements such as walls, elevations and columns. This level helps to better visualise and calculate space parameters.

LOD 300 (Precision Geometry)

LOD300 corresponds to the construction documentation stage. It includes the modelling of elements with exact quantity, size, location, orientation, details, fabrication, assembly and installation information. This level is used during the construction phase and includes precise representation of structural, mechanical, electrical, plumbing and fire protection components.

LOD 350 (Precise Geometry with Connections)

In LOD350, elements include all the information from LOD 300, along with interfaces, supports and connections to other building components. This level emphasises the coordination between different systems and disciplines, showing their interaction. The LOD 350 models enable effective collision detection and coordination between different trades.

LOD 400 (Production)

LOD400 focuses on complete production and assembly information. The model contains details that can be directly used by suppliers to produce the represented building components. This level includes but is not limited to, accurate representation of structural components, fire protection systems, plumbing and mechanical / HVAC systems. The LOD 400 models streamline the production process and support efficient construction workflows.

LOD 500 (Post-production)

#LOD500 represents the final stage of a project, where the model contains all the necessary information for operation and maintenance throughout the building life cycle. This level includes geometry, maintenance, equipment and additional information required to manage the facility. The LOD 500 models serve as valuable reference points for the ongoing operation and maintenance of the facility.

How do you find the right LOD for your BIM project?

Finding the optimal LOD for a project depends on its specific needs and objectives. A well-defined BIM Execution Plan (BEP) plays a key role in determining the desired LOD based on key performance indicators (KPIs). It is important to align the LOD requirements with the project objectives, taking into account factors such as facility management, precast production, schedule and cost management. Furthermore, the project team should establish effective workflows and ensure continuous communication to maximise the benefits of BIM implementation.

In a nutshell, the journey to finding the 'ideal' level of LOD can be described by individual milestones:

Finding the right LOD for a BIM project is a collaborative and iterative process. It requires a thorough understanding of the project objectives, effective communication with stakeholders and a flexible approach to adapt to changing requirements. By carefully assessing the various stages of a project, its complexity and resource constraints, you can find the right balance and maximise the benefits of BIM implementation.

While BIM offers numerous benefits, it is crucial to bear in mind that successful implementation requires more than just detailed modelling. Proper data management, including effective tagging, attributes and naming conventions, is key to realising the potential of BIM. To realise the full potential of BIM, project teams need to prioritise updating the model in real-time, ensuring it remains the 'single source of truth' throughout the project lifecycle. By asking the right questions and using the relationships of locations, objects and data, the model becomes a valuable resource for decision-making and problem-solving.

Ready to take the guesswork out of your BIM project?

Whether you’re just starting or deep into design coordination, choosing the right Level of Detail (LOD) is not just a technical decision—it’s a strategic one.

• Need help defining LODs in your BIM Execution Plan?

• Want to make sure your model becomes the single source of truth?

• Curious how LOD connects to cost, timeline, and FM goals?

Let’s talk. Our BIM experts at FRESCON can help you align project goals with the right level of detail—so your model works harder, smarter, and more collaboratively.

One of the smartest tools helping us do just that?

4D BIM construction simulation.

It’s not just a buzzword — it’s a powerful method we use every day for BIM Visual Project Planning & Control. It’s changing the way our teams design, plan, and build.

In this article, we’re breaking down:

• What 4D BIM scheduling actually means

• How it works in real-world construction

• Why it’s a game-changer (and how we use it at FRESCON)

So, What Is 4D BIM Scheduling?

Think of 4D BIM as a 3D model with a clock built in.

You start with a detailed BIM model — walls, windows, structure, materials, MEP, all of it. Then you integrate the time dimension, showing how the project will evolve week by week, phase by phase.

What you get is a digital simulation of the entire build.

A visual timeline that plays out the construction process in real-time, like a movie you can pause, rewind, and rework.

Why We Rely on 4D BIM at FRESCON

1. Everyone’s on the Same Page

No more confusion over who’s doing what, when. 4D BIM aligns architects, engineers, contractors, and suppliers around one visual schedule. You see the plan — not just read it.

2. We Catch Issues Before They Happen

By simulating every task and its dependencies, we spot potential clashes or delays before they hit the site. That means fewer surprises — and fewer budget blowouts.

3. Smarter Use of Resources

Materials, machinery, labour — 4D BIM lets us plan it all down to the hour. Result? No idle teams, less waste, and better cost control.

4. Agile, Informed Decision-Making

When plans shift (and they always do), we adapt in real-time. The model helps us re-sequence tasks without losing momentum.

How We Actually Do It: A Peek Inside Our 4D Workflow

Step 1: Build the 3D BIM Model

We start by modelling the entire project — geometry, materials, specs. This is our data-rich foundation.

Step 2: Sync It with Scheduling Software

We use tools like SYNCHRO, NavisWorks, or 4D Suite-Soluciones 360 to connect the model with the timeline.

Step 3: Break the Build Into Tasks

From excavation to finishes, each phase gets sequenced and scheduled.

Step 4: Generate the 4D Simulation

This is the magic moment — a digital animation showing how the build unfolds. Our clients love it, and it’s invaluable for coordination.

Step 5: Track Progress and Adjust

As work moves forward, we update the model and timeline, adjusting for real-world shifts.

Real-World Applications of 4D BIM at FRESCON

High-Rise Developments

Coordinating structure, trades, and facade works across dozens of floors? 4D BIM makes it manageable — and visual.

For large-scale, multi-phase projects like high-rise buildings, 4D BIM scheduling has proven invaluable. By visualising the sequence of construction activities — such as foundation work, structural framing, and façade installation — we can optimise workflows, avoid delays, and ensure that resources are used efficiently across different trades.

Infrastructure Projects

From roads to bridges, we map out each step, minimise traffic disruption, and ensure every sequence makes sense.

In the case of infrastructure projects such as roads and bridges, 4D BIM helps us visualise

complex construction sequences, ensuring that the project is completed on time and with minimal disruption to traffic or surrounding communities. The ability to see every phase of construction, from excavation to final paving, allows for precise coordination

Renovations & Retrofits

Working inside existing buildings is a logistical puzzle. 4D BIM helps us plan around tenants and infrastructure without chaos.

Final Thoughts: The Future’s Already Here

4D BIM is just the beginning. As we move toward 5D (cost), 6D (sustainability), and 7D (lifecycle management), the way we plan and deliver projects will only get smarter.

At FRESCON, we’re not waiting around for the future — we’re building it.

Want to see BIM Visual Project Planning & Control in action?

Let’s talk. We’ve got stories to show — and simulations to share.