The fortified farm of Baya has operated as such since the beginning of the 17th century. The buildings in limestone, sandstone and brick are classical in appearance and are arranged in a U-shape that opens to the south. The living quarters date from the middle of the 18th century and are presented in the way of a leisure residence. The building's horizontality is accentuated by a prominent string course marking the level of the upper levels. Made up of nine bays, of which five protrude in the centre, the house is characterised by its vertical symmetry. It rises from a cellar level, there is a mezzanine that is accessed by a double flight of stone steps bordered by a wrought iron Regency guard rail, a second storey and attics. The house has a slate mansard roof with dormer windows of the 19th century.
The perpendicular wings are partly behind the main body of the building. The west wing has an entrance porch with lowered gates and mansard roof. The opposite wing features the same gates, but has been raised and given a hipped bâtière roof. The western section was developed into living quarters in the 18th century, while the eastern side was converted in the 19th and 20th centuries. The interior of the fortified farm is exceptional for its stuccoes decorating the vestibule and grand drawing room, the paintings on three ceilings, the staircase and bedrooms.
Exceptional heritage site of Wallonia (stuccoes in the vestibule and grand drawing room and three painted ceilings)