Later he made various studium journeys in Germany, Holland, Austria, Italy and France, hereafter Brodtbeck worked in Lausanne.
Throughout the district of Basel, the architect's bureau W. Brodtbeck AG became famous due to their modern style buildings.
The Wasserhaus estate was developed by Brodtbeck concluding the original plans drawn by Prof. Hans Benno Bernoulli, Basel, (1876–1959).
Due to the unique archetype nature and the prototypical neighbourhood, the Wasserhaus estate was taken up in the Swiss Inventory of Cultural Property of National and Regional Significance.
Wilhelm Brodtbeck worked 20 years in the commission for the municipality („Gemeindekommission") of Liestal and he was member of the board of management of the Basel protected historic site/landmark (Heimatschutzes).