St Andrews Castle

St Andrew's Castle is a house that was later converted into a convent school and is now used as offices. It dates from the late 18th century to early 19th century and features rubble stone walls with stone dressings, castellated parapets, and moulded stone string courses, all under slate roofs. The building is designed in the Regency Gothick style with an irregular plan.

The east front showcases a round tower that projects from the south end and a small round turret at the north-east corner. It has two storeys and three windows, featuring 12-pane sashes with arched glazing bars in the upper lights along the main front, as well as a larger sash window with ornate Gothick tracery in both storeys of the tower. A stuccoed entrance porch, adorned with corner turrets and castellations, includes a moulded pointed-arched doorway.

The south front has a projecting centre and a moulded stone string course separating the storeys. At the south-east corner, there is a single-storey flat-roofed castellated and canted bay with three sash windows divided by slender columns, topped with a cornice and frieze. The remainder of the south front has five window ranges, all 12-pane sashes with arched glazing bars in the upper lights. A later single-storey extension in white brick at the south-west end is built in the Victorian Gothic style and features a three-light window with coloured glass.

Inside, the ground storey retains many original Regency Gothick features, including an entrance hall with a plaster groined and vaulted ceiling supported by a central pillar and half-round columns against the walls. The pointed arched doors have architraves with similar wood columns. Some rooms display a mix of Classical and Gothick motifs in the plaster decoration, while one room features a ribbed plaster ceiling in Jacobean style. The Victorian extension at the south-west corner has heavy panelling and was used by the nuns as a chapel. The staircase includes late 19th-century details and a dado.