The estate on which Chateau Jumanji is situated, was sold in 1575 from the properties of a nearby beguinage. This is evident from old archival documents. In the early 1880s, the old castle was demolished. The current country house was built using the stones from the demolition. It became a simple, plastered and painted country house in a neoclassical style.

Around 1910, a remarkable brick winter garden was constructed against the eastern facade. It was completely clad in grey cement and decorated with imitation tree trunks and rockwork. At the front, a staircase between the artificial rocks led to the terrace with railings made of imitation branches. Climbing plants give the whole a very natural appearance.