Smailholm Tower is a 15th century stone tower house of four storey and a garret, founded by the Pringle family. The plain rectangular tower, with the foundations of an outer hall, a chamber and a kitchen stand within a small barmkin, once entered through a stout gateway. The arched entrance into the tower house is well defended, with an outer door, an inner yett and an inverted-keyhole gun-loop directly above. A spiral stair close to the door, gives access to all floors, with a vaulted third floor hall and a vaulted roof in the garret. The gun-loop in the west gable and two short stretches of wall-walk and parapet to the north and south are 16th century alterations. 4 miles south-west is Dryburgh Abbey Gatehouse and 5 miles east is Floors Castle.