The original tower was composed of a basement and first floor, about 70 feet high, or, as now seen, 60 feet. There remains within, against the west wall, a not very high-pitched weather-table, which shows, as at Porchester and Richmond, where the roof abutted against the wall as a gable. The wall was carried all round, high enough to conceal the roof. The west angle contains a well-staircase, which rose from the basement to the first floor. The door into the basement is buried, but the line of the steps in the wall points downwards. A breach has been effected in the west wall exposing the staircase, and seems to occupy the place of a loop. In the west wall of the basement are two acutely-pointed recesses, terminating in square-headed loops; and in the south wall is a doorway, of 5 feet 6 inches opening, also under an acute arch. It is possible that this basement was vaulted, though it is more probable that the covering was of timber. The first floor was originally lighted by three windows, in early pointed recesses, of different sizes and heights, and above the central recess, which was placed lower, to give place for it, are a round-headed recess and a window, placed in the angle of the gable. The three lower windows have been replaced by three lancets, and the recesses reduced in height and proportion to suit. The later arch is handsomely ribbed. It is uncertain how the first and main floor was covered over. In the north wall are seen the springing-stones of three ribs, evidently part of a vault; but near them is a short table, with four corbels, possibly connected in some way with the stair-entrance. Also there are fragments of two ribs in the west wall, so that the arrangements of the vaulting are obscure. The ribs mentioned are plainly chamfered, and may be early English, or later. An addition of about 30 feet has been made to the original keep, giving it an upper or second floor. In the west wall of this addition is a pointed window in a segmental recess, resting on the old masonry. In the north wall is another pointed window and a fireplace. There is a loop towards the south; but this part of the wall, both inside and out, is obscured by ivy. In the wall of this floor, cutting the line of the windows, is a corbel-table, the corbels cut somewhat into the shape of heater shields. This must have supported the roof, but have interfered seriously with the windows. How this story was reached does not appear; probably by a well-stair in the wall, now destroyed, a point which could, no doubt, be ascertained by uncovering the fragments in the ditch. The upper wall seems as thick as that below; and it is curious that there are no traces visible of mural galleries or chambers.