Are 3D as-built models with ±1 cm accuracy always useful?

Today, modern 3D laser scanning technology enables as-built models with an accuracy of ±1 cm. Technically, this is no problem for us. However, the crucial question in practice is:

Does every project need this level of detail?

At VDE, the answer is clear: we are convinced by high-precision as-built models - but only if they create real added value for planning.

Why high accuracy is crucial in existing buildings: Existing buildings rarely correspond to the original plans. Deformations, conversions and deviations occur over decades.

A precise 3D model from point clouds enables

• a reliable planning basis for conversion and refurbishment
• Reduced risks on the construction site
• Reliable dimensional basis for architecture and specialist planning
• direct further processing in CAD / BIM

Particularly in the case of complex interventions, accuracy often determines costs, deadlines and feasibility.

A high level of detail is particularly recommended for

• Conversions and renovations of older buildings
• listed buildings
• deformed or historic buildings
• tight tolerances or prefabrication

Here, the building becomes a reliable basis for planning - not an assumption.

A common misconception: more details automatically mean better models.

An as-built model is a planning tool, not a digital end in itself. Depending on the project, reduced modeling can be more efficient, for example in early study phases or for clearly defined interventions.

The key skill therefore lies not in scanning alone, but in the correct definition of:

• Accuracy
• Level of detail
• Modeling objective

Conclusion

At VDE, we follow a clear approach: As precise as necessary. As efficient as possible.

3D models with an accuracy of ±1 cm are a decisive key to planning reliability in existing buildings - but they only develop their strength when precision is used in a targeted manner.