Janssen de Jong Bouw works in the Dutch prefab market with an emphasis on prefab housing and industrialised construction. Its proposition is built around making construction more structured: designs are prepared in advance, components or complete units are produced in a controlled setting, and projects can be planned with less uncertainty than fully conventional building.

The company is most relevant for project-based or commercial housing, serving buyers who want a practical building partner rather than a purely catalogue-based seller.