From point cloud to BIM model: how Scan-to-BIM works in renovation projects
You are about to renovate, but up-to-date drawings are missing or no longer accurate. Measuring by hand takes time, introduces inaccuracies and never gives a complete picture. Scan-to-BIM solves that: a 3D laser scan records the existing situation and is then translated into a complete BIM model in Revit. This article explains step by step how that works.
What is Scan-to-BIM?
Scan-to-BIM is the process in which a point cloud, the result of a 3D laser scan, is converted into a structured BIM model. Where the pointcloud is raw measurement data (millions of points without interpretation), the BIM model is an editable working document with identifiable objects: walls, floors, doors, windows, pipes and building services.
Scan-to-BIM is aimed specifically at existing buildings and renovation projects. In new construction the BIM model is built from scratch during the design process. For existing buildings those design files are often missing, outdated, or do not match the actual situation. The scan delivers the current state; the BIM model makes it usable.
The process step by step
1. Scanning
The first step is to record the existing situation with a 3D laser scan. The scanner emits around 600,000 laser pulses per second and builds up a three-dimensional image of the entire environment point by point. At the same time, 360-degree photographs are taken automatically.
The scanning work does not disrupt the use of the building. Staff and residents can simply carry on. Anyone who appears in shot during the scan is automatically removed from the data.
2. Registration and clean-up
After scanning, the individual scans are merged, aligned and cleaned up. The result is a clean point cloud, usually available within 24 hours.
3. Modelling in Revit
This is the heart of Scan-to-BIM. A BIM modeller loads the point cloud into Revit and builds the model. The point cloud acts as a measurable underlay: every object (wall, floor, door, pipe) is traced from the scan data and given the correct dimensions.
You can then add properties to each object: material type, classification, maintenance information. What you record depends on the agreed level of detail (LOD). LOD 200 is a basic model with overall shapes and dimensions. LOD 300 contains accurate geometry suitable for design and engineering. LOD 400 adds fabrication information.
4. Quality control
After modelling, the BIM model is laid back over the point cloud. This is the model check: deviations between model and reality are made visible and corrected. That way you know the model matches what is actually there.
5. Delivery
The BIM model is delivered in Revit (RVT) and/or as an IFC file, depending on what has been agreed. IFC is an open standard that opens in virtually any BIM software, regardless of which package the other parties on the project use.
Why Scan-to-BIM for renovation?
In renovation the existing situation is the starting point. Without reliable data on what is there, you work on assumptions. In practice that leads to familiar problems:
•A design that does not fit because the actual dimensions differ from the drawing
•Pipes or structural elements that turn out to be somewhere other than expected
•Additional work and delays on site due to unforeseen situations
•Disputes over responsibility when the basis is wrong
Scan-to-BIM removes that uncertainty. You work on a model based on the actual, measured situation, not on a drawing from twenty years ago.
What determines the lead time?
The lead time of a Scan-to-BIM project depends on several factors:
•Size: an office floor is modelled faster than an entire factory with building services
•Complexity: a lot of pipework, irregular geometry or multiple storeys take more time
•Level of detail (LOD): the more information you want in the model, the longer the modelling takes
•Available documentation: if partially usable drawings or other archive material still exist, that can improve the quality of the model. Information about foundations, wall build-up and concealed structures comes from existing documentation.
The scanning phase itself is fast: 1,500 m² in an hour with the NavVis VLX, cleaned-up data within 24 hours. Modelling can often start immediately after the scan. The total lead time is agreed in advance, so you know what to expect.
In summary
Scan-to-BIM translates reality into a workable model. It starts with a scan, moves through registration and modelling in Revit, and ends with a verified BIM model ready for design, coordination or management. For renovation projects where up-to-date drawings are missing or unreliable, it is the fastest route to a reliable basis.
Projects we have delivered
56+ clients in 7 countries. Over 2,000 scans completed in 5 years.
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