The building has the common rectangular shape, and in order to achieve a reminiscence of Serbian traditional folk houses, the ground floor was built of stone while the first floor was built of brick and plastered, and later painted in elegant white. Due to the cold and hot temperatures in this area, both the outer and inner walls are thick.

The castle is a two-storey building, and on the ground floor there is a spacious hall and two rooms. Monumental stone steps lead to the first floor, where there is a lounge with a balcony, and four bedrooms, the usual manner of the then castles. In front of the castle was a small courtyard and a vaulted gate.

As it was customary for all people to follow the crowned heads, so in Serbia during the reign of Prince Alexander Karađorđević, from 1842 to 1858, Brestovačka Banja became the fashionable centre of Serbia, since members of the ruling family came after the prince, and others who wanted to be in their company – especially eminent and the rich people.

Prince Alexander liked to spend the summer bathing, resting, walking and hunting game. Immediately after the castle, the prince had several ancillary buildings built in close proximity around the castle, and these were primarily “Adjutants konak” and “Vidikovac”, which do not exist today. Also, another building disappeared: a great flood at the beginning of the 20th century destroyed a large three-storey building known as “Konaks of kneginja Ljubica”.