The monument comprises the remains of remains of Kilmory Castle, which stand above a steep slope, next to modern farm buildings.
The visible remains consist of one end of the bottom floor of a rectangular, rubble built building. To this has been added a circular corner tower which similarly now stands to only one storey in height. There is no access to the tower from the main block at ground floor level. The rectangular block is aligned NW-SE with the corner tower on its E corner, the S and W corners being absent.
There are two surviving circular gun loops in the tower. The rectangular section of the building was built using clay rather than the lime mortar used in the corner tower.
The castle belonged to the Jamiesons of Kilmory and, according to the New Statistical Account, formerly consisted of several buildings and towers.
The area to be scheduled is defined by the line of the gable of the modern farm building to the SE, a line 2m out from the NE wall of the rectangular block and the curving top of the rocky slope which runs to the west of the walls. The area is irregular in shape, measuring approximately 20m N-S by 10m, and is marked in red on the accompanying map extract.