The castle and its gardens were surrounded by a tall hedge which functioned as a living wall. The original castle was owned by the barons of Freyberg until 1639 after which time it changed hands several times before being bought by Baron Beat Conrad Reuttner von Weyl in 1795. He had the current castle built in 1794–1796. The architect was Franz Anton Bagnato. The building works started one year before the actual contract of sale was signed. Beat Conrad Reuttner von Weyl must therefore have been quite certain of his future acquisition. During the first half of the 19th century, the pond and the moats that surrounded the previous castle were drained and turned into a park. Most recently restoration works at the castle took place in 1982 and 1983. In 1996 a fountain, which already appeared in the original plans by Bagnato, was erected in the castle yard. Achstetten Castle and its estate are in the possession of the family Reuttner von Weyl who still reside at the castle. It is also home to the offices for the administration and the management of the estate. The castle is in private hands and not accessible to the public.