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This building was used to store and wash prisoners’ uniforms and bedclothes. The main washroom was in the single-storey left wing. To the right of the central hallway, spread over two floors, were the drying chamber and the mangling and ironing room, and above them, the stores for dirty laundry and fresh laundry. Elevators were used to move loads.

Up until 1877, all the prison’s laundry was washed by hand in tubs. As the prisoner population grew, washing machines, a dishwasher and a second spin-dryer were installed. The wastewater flowed down gutters in the floor into clay pipes, which led to the main water disposal pipe.

Energy was provided by a wall-mounted steam engine with 6 HP. Temperatures reached up to about 50 °C in the dry room, which had an extractor fan and a top-hung window. There is no cellar beneath the building.