The walls are everywhere pierced with putlog holes, about 4 inches square, indications of the method of construction, and probably originally but loosely stopped to allow the work to dry and for the convenience of future repairs. There are no large holes above, and no signs of a bretasche having been employed. Four double windows on the upper floor and one on the east face of the middle floor, though original, have been fitted up with cut brick mullions and arches of perhaps two hundred years ago, the work, no doubt, of the first purchaser. All earlier alterations seem to have been effected in stone. Having thus disposed of the general exterior of the keep, the next step is to describe its interior details. Allowing for the removed plinth or casing, three of the faces are about 11 feet thick and the fourth or east about 14, so that the interior dimensions are 24 feet north and south, by 27 feet east and west. The building is composed of a basement and two upper stories, and the floors and roof were of timber. There is no evidence of any subterranean chamber, and no reason for supposing one. The basement on the level of the top of the mound is about 12 feet high. The walls are pierced in the centre of the north and south faces with a round-headed recess 5 feet wide and about the same height to the springing. The sides and roof converge to an exterior loop, and the base is stepped up to it. The work is good plain rubble. The east and west walls were originally solid, and the only entrance to this floor must have been by a ladder and trap from the floor above. It was of course a store or cellar, as usual. At a later date, a doorway, 4 feet 6 inches broad and 8 feet to the springing, has been cut through the west wall near the north end. This has a slightly pointed arch. Its masonry is of small weak rubble without any dressings; and this, and the absence of bond with the older work, show it to be an insertion. In the north-east corner, the wall has been rudely cut away to some depth to form a fireplace and an oven. The bricks composing these have been removed, and a recent pier of masonry supports the wall above. The chimney shaft of this and a fireplace in the floor above have been formed by cutting away the inner face of the wall, which has been rudely restored. No doubt all this is the work of the purchaser, who seems to have lived in the keep and converted the basement into a kitchen. In the south-west corner is a small platform of stone, said to have carried a wooden stair communicating with the floor above, and of the date of the kitchen. This is probable enough. One of the stones is a late Norman capital, brought from some other part of the castle. The whole interior of this basement is rubble. It contained neither fireplace nor garderobe. The two loops, its only light, are about 18 inches high, and were probably 4 inches broad, though now increased by weather to 6 inches.