Here's How We Take 3D As-Built Models to the Next Level

Digital as-built surveys are no longer just about capturing geometry. In a recent project, we worked with one of our regular clients to develop a 3D CAD model that goes much deeper—based on a precise point cloud, supplemented by expert knowledge and coordinated planning.

A good example of this is the ceiling structure. It consists not simply of a single surface, but of the floor structure, the supporting framework, and the suspended ceiling. Through targeted surveys and collaboration with the architect, we were able to precisely separate these layers and model them realistically.

The concrete ceiling was modeled as a continuous element. Anything above the upper edge of the concrete is part of the floor structure. Everything below the lower edge of the concrete belongs to the suspended ceiling. This clear definition ensures transparency and predictability.

We systematically consolidated elements with consistent heights. When multiple components have the same height—for example, in the floor structure—we combine them into a single element. The result is a clean, efficient model with a clear structure.

We also apply this consistency to the walls. They extend all the way to the concrete ceiling, without any arbitrary interruptions. In addition, we specifically used component tools in this project to facilitate further processing in CAD. All elements are constructed parametrically, precisely, and in a traceable manner—ideal for planning, bidding, and BIM processes.

Our model is based on the architect’s floor plan structure. The floor-to-floor heights were clearly defined, coordinated, and incorporated in advance. This provides certainty and prevents design errors later on.

To create a model at this level, clear communication, well-structured information from the architect, and, if necessary, on-site sondages or exposed building components are required. After all, our scanners can only see what is visible. The layer information must come from the design team—the more precise it is, the better the result.

An intelligent 3D as-built model delivers real added value for renovation planning and restoration. It creates transparency, simplifies coordination, and ensures significantly greater planning reliability. That is precisely our goal—we take digital as-built models at least one step further.

Key Insights on 3D Surveying & 3D Modeling

What is the advantage of 3D surveying for existing buildings?
3D surveying delivers point clouds accurate to the millimeter that realistically capture the as-built condition. VDE Villa Digital Engineering AG supplements this data with expert knowledge and coordinated planning to create a structured, usable model.

How does precise 3D modeling work for existing buildings?
In 3D modeling, not only surfaces but also component layers—such as floor construction, structural framework, and suspended ceilings—are depicted with precise separation. VDE relies on clear definitions and consistent model structures.

Why are component details important in a 3D model?
Detailed component definitions increase planning reliability and prevent errors. For example, VDE models concrete slabs as continuous elements and clearly distinguishes between the floor structure and the ceiling.

How does 3D modeling support the BIM process?
VDE’s parametric, logically structured components enable direct integration into CAD and BIM workflows—ideal for remodeling, renovation, and bidding.

What role does communication play in 3D surveying?
Accurate results require close coordination with architects, clearly defined floor plans, and, if necessary, on-site surveys. VDE relies on transparent processes to achieve the best possible results.

Who benefits from a detailed 3D as-built model?
Architects, designers, and building owners who need a precise foundation for remodeling and renovation projects and want to benefit from VDE’s expertise.