The house was once built as a mill and called „Gmach-Mühle“ and is as such already recorded in the 16th century in the documents  (Urbaren) at the monastery Mondsee.

Since the 18th century the mill is registered at the monastery documents as “Ehe-Mühle in der Au ” (marriage mill) but has since been called by the local people after its owner Philip Hupf (1764-1771) “Hupfmühle”.

The mill is also said to have played a certain role in smuggling as the house was built very closely to the former border of the arch bishop diocese Salzburg and Austria. The story however can’t be proven only the fact that its registered name used to be “Mühlen-Gerechtigkeit” (mill of justice which certified its right of trade in those days) until the right expired in 1884.