Talstrasse, Pfäffikon

The project is based on an evolved building complex with different construction phases, load-bearing structures and uses. A consistent planning basis from as-built plans was only partially available and inhomogeneous.

The focus was therefore not on supplementing existing data, but on completely re-recording the current condition.

The survey was carried out using 3D laser scanning across the entire site with the aim of creating a seamless point cloud as a geometrically reliable basis - particularly in areas with complex transitions, extensions and different façade and roof structures.

A consistent 3D as-built model was created on this basis.

The focus here was on

- consistent representation of the real geometry across all parts of the building - clear separation and structuring of the different construction phases in the model - precise formulation of the building envelope including façade grid, openings and roof structures - comprehensible interfaces between the existing building and potential interventions

The modeling is deliberately not intended to simplify, but to make a complex existing building legible.

Large-scale transformations in particular show that planning quality is directly dependent on the quality of the existing building. Unclear or generalized geometries lead to assumptions - and these have an impact on the subsequent planning process.

The 3D model creates a uniform reference for all project participants.

It enables

- reliable volume and area analyses - clear spatial classification of new interventions - reliable coordination between architecture, technology and execution

This means that the existing building is not only documented, but can also be used as an active planning basis.

In the context of current developments - away from new replacement buildings and towards the further development of existing structures - this type of modeling becomes a prerequisite for well-founded decisions.

Not as an addition, but as a starting point.