Walnut Villa at St Ebba's Hospital

Walnut Villa at St Ebba's Hospital is a hospital villa accommodation built in 1901 by Clifford Smith for the London County Council. The building features altered red brick and a plain tile roof, designed in a half-butterfly plan with two wings forming a "V". It is a single storey with a partial attic and has seven-bay wings that meet at a gabled entrance bay, showcasing the Arts and Crafts style.

The windows are small-pane sashes, with some replaced by single-pane glazing, and they feature flat brick arches with keystones. The doors have vertical glazed panels. The entrance bay includes a wide, keyed, segmental archway leading to a recessed double door, which has an upper part with small panes, a small-pane overlight, and narrow side windows. The gable displays applied timber studs on a brattished bressumer, with painted, pebble-dashed panels and a three-light small-pane casement window. It also has barge boards and a tile-hung and louvred ridge cupola topped with an ogee cap and finial.

The wings have a bay nearest the center that projects, along with a third bay that forms a canted bay window. There is a glass-roofed verandah between the two projections of the right-hand wing, which likely also extended from the left-hand wing, covering the doorway. Late 20th-century small added blocks at the end of each wing are not of special interest. The eaves feature a moulded wooden gutter, raised verges with shaped ashlar kneelers, and ashlar coping.

Walnut Villa is one of the eight original villas at St Ebba's Hospital, the first villa-style institution for people with epilepsy in England. Together with Limewood Villa and Thorn Villa, it forms a group around the cricket ground.