Cal Bach is a modernist house in the centre of Prats de Lluçanès. In fact, this building is the current headquarters of the Town Hall of Prats de Lluçanès.
This building was designed by the architect Ramon Duran i Reynals, and was built in 1924. It is a two-storey house, built with stone. In the main door there is a porch with four masonry columns.
Inside the building there is still some modernist-style furniture. However, most of the modernist elements were destroyed when it was decided to locate the headquarters of the Town Hall of Prats de Lluçanès in this building.