House incorporating medieval tower house. C14 for the Priory of St Mary's, Carlisle, with c1690 facade and early C19 additions. Red sandstone ashlar walls with white freestone dressings, graduated slate roof and 4 ashlar ridge chimney stacks, 2½ storeys, 7 bays: large rectangular tower approximately 8.3 metres wide by 19.5 metres long with walls 2 metres thick, encased entirely within the later house, but front wall for full length and one and a half storeys high, is original building. Entrance has freestone moulded surround, with moulded entablature, swan neck pediment and scrolled console brackets. Ground floor tripartite windows, with red sandstone moulded surrounds, swan neck pediments and scrolled console brackets on pilaster strips, probably date from early C19. String course to first floor and raised panel joining central upstairs window to entrance: first floor windows with c1690 freestone moulded surrounds, central window with scrolled console brackets. Raised quoins to first floor, chamfered plinth course of original tower can also be seen on side wall and internally, now forming dividing wall between rooms. Moulded cornice, prominent cast-iron gutter, one gable with plain coping the other crow-stepped with pinnacles to front and back: chimney stacks have drip moulds and cornice. Sash windows with glazing bars and oak iron-studded door with leaded fanlight. 2 extensions of 2 storeys, 2 bays, to left, of coursed sandstone rubble, have plain surrounds to entrances and windows: slate roof and brick chimney stacks, early C19 sash windows with glazing bars, plank doors. Facade has terrace wall of 3 courses of red sandstone ashlar, with steps to entrance. Internal features include vaulted 2-chamber cellar, beneath entrance hall: medieval barrel vaulting to entrance hall, with oval early C19 staircase and rib-vaulted plasterwork to ceiling and staircase arch