The following text is from the original listed building designation:
TQ 64 NE CAPEL MAIDSTONE ROAD, WHETSTEAD
2/270 Garden walls approx 2m east of Stone Castle Farmhouse
GV II
Garden walls. Mid/late C19. Brownish red brick, mostly laid to stretcher bond. Tall wall enclosing the north and east sides of the garden immediately east of Stone Castle Farmhouse (q.v.). In the north-east corner there is a small square-plan summerhouse. In the south wall it has an original 3-light window with a timber-frame and margin glazing bars under a low segmental arch (smaller single light on the east side). Doorway into west side. Summerhouse has a stucco frieze enriched with lozenge motifs under a moulded timber eaves cornice including a dentil frieze. Peg-tile pyramid roof. The walls have external flat pilaster-like buttresses. The north wall ramps up to a higher level in the middle. Towards the farmhouse the west end is C20.
Listing NGR: TQ6581846204

English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.