Caisteal Cona Bhacain is an interesting site in that it is of a type unique to the Glen Lyon area. Sometimes described as a homestead, sometimes described as a fort, what is clear from the remains is that this structure was certainly defensive in nature. Massive boulders make up a circular wall between 3m and 4m thick, with an entrance at the eastern end.

The plan of the structure is oval in shape, measuring approximately 27m east to west by 20m north to south.