Building digital twin: what it is, what it is for, and how it is made
What a building digital twin is, how it is made from LiDAR scanning to point cloud to BIM model, what it is used for, and how it differs from a virtual tour.
A building digital twin is an accurate digital model of an existing structure, built from real measurements of the space rather than assumptions. It is created by 3D laser scanning that records every surface exactly as it is, and that record becomes a model you can review, measure, and share without another site visit. Unlike original design drawings, a digital twin shows the building in the condition it is actually in today.
This article explains what a digital twin really is, how it is made step by step, what it is used for in everyday work, and how it differs from a virtual tour.
What is a building digital twin?
A digital twin is a faithful digital copy of a physical asset. For buildings, that means a precise record of the geometry of a space: walls, openings, heights, services, and the relationships between every element, all in one place and in a single coordinate system.
The key phrase is "as-built condition". Design documentation describes how a building was meant to look. A digital twin shows how it looks after every alteration, extension, and year of use. That is why it is useful to anyone who cares about the real state of a building rather than an intention from decades ago.
A digital twin is not a single format. It can be an interactive virtual tour, a raw point cloud, or a full BIM model, depending on what you need. We cover these levels further down.
How is a digital twin made?
The path from building to model has three clear steps.
Step 1: LiDAR scanning. A crew comes on site with a scanner. The device emits light pulses and measures how long each takes to return, then records the geometry of the space from millions of such measurements. We use the Matterport Pro3, a latest-generation LiDAR scanner, with documentation accuracy on the order of ±20mm. A mid-sized building is captured within a single day.
Step 2: point cloud. The individual scans are registered, meaning stitched into one connected record of the space. The result is a point cloud: a dense mesh of coordinates describing every visible surface. It is delivered in the standard e57 format, which every serious design tool can read. The point cloud is the source of truth for everything that follows.
Step 3: the model. From the point cloud we build whatever you need. For reviewing a space, that is a virtual tour. For design work, that is a BIM model in tools such as Revit or ArchiCAD, where each wall, slab, and opening becomes an element with its own properties. This step is described in detail on the Scan-to-BIM page.
What is a digital twin used for in practice?
A digital twin is most useful where the cost of an error is high and returning to site is expensive or impractical. A few typical uses:
- Facility management and building operations. The digital twin becomes the basis for maintenance planning, the layout of services, and space management. The team responsible for the building has accurate insight without a physical walkthrough.
- Renovation and refurbishment. The designer starts from the real condition rather than outdated drawings. Fewer surprises on site means fewer design revisions and delays.
- Sales and leasing. A virtual tour lets prospects visit the space remotely, at any time, with accurate dimensions at hand.
- Documenting before works. A record of the existing condition protects every party, because it captures the building before anything changes.
Once created, a single scan serves several teams in parallel, each for its own purpose. That is the heart of the value: one site visit, many uses.
What are the levels of a digital twin?
Not every project needs the same level of detail. This table helps you pick the right one.
| Level | What it contains | Who it is for |
|---|---|---|
| Virtual tour | Interactive 3D walkthrough, basic dimension measurement, sharing by link | Sales, leasing, presentation, hospitality, retail |
| Point cloud (e57) | Raw point cloud with full geometry, a base for further work | Designers, engineers, teams that model themselves |
| BIM model | Parametric 3D model with elements and their properties (Revit, ArchiCAD) | Renovation, design, facility management |
Many projects combine levels. A virtual tour and a point cloud often go together, and a BIM model is added when there is a design task. More on the interactive walkthrough on the Matterport virtual tours page, and on the tour format itself on the Virtual tours page.
How much does a building digital twin cost?
The cost does not come down to a single item. It depends on several factors:
- Building size and complexity. A larger, more irregular space takes more time on site and in processing.
- Delivery level. A virtual tour, a point cloud, and a BIM model differ in the scope of work.
- Model level of detail (LOD). A more detailed BIM model requires more modeling.
- Access to the space. Furniture, operating hours, and access to certain zones affect the schedule.
That is why we do not publish fixed prices: every building is different. The fastest route to an accurate estimate is to describe the building and your goal. Request a quote and we come back with a clear scope and timeline.
Digital twin versus virtual tour: what is the difference?
This is a common point of confusion. A virtual tour is one form of digital twin, but not the only one.
A virtual tour is meant for review: you walk through the space in a browser, get a feel for the layout, and measure basic dimensions. It is perfect for sales, leasing, and presentation.
A digital twin in the full sense goes further. Alongside the visual walkthrough, there is measurable geometry in the form of a point cloud or BIM model, used for design, renovation, and building management. In other words, every virtual tour is a kind of digital record, but not every digital twin is only a tour.
Frequently asked questions
Is a digital twin the same as a BIM model? Not necessarily. A BIM model is one level of a digital twin, the most detailed one, meant for design. A digital twin can also be a virtual tour or a point cloud, depending on the need.
How accurate is a digital twin? Scanning with the Matterport Pro3 gives documentation accuracy on the order of ±20mm, which is more than enough for design, renovation, and building management. It is not the highest-precision survey metrology, but for work on buildings it is a reliable base.
How long does it take to produce? Scanning a mid-sized building usually fits within a single day. Processing and modeling depend on the chosen delivery level and are agreed in advance.
Can I get just a virtual tour, without a BIM model? Yes. Levels are chosen to match the goal. Many clients start with a tour and a point cloud, then add a BIM model later, once a design task appears.