Greenhouse and Store at Glenarm Castle, Glenarm Demesne, (off Straidkilly Road), Glenarm, Ballymena, Co Antrim, BT44 0BD

A long single storey lean-to greenhouse with a substantial row of rubble-built stores and sheds to its rear, set on the north side of the walled garden at Glenarm Castle, northwest of the Castle itself.

The structures are built back to back as lean-tos on either side of the north wall of the walled garden and extend approximately 50 metres in length. They are constructed along a sloping site, which has resulted in distinctive sloping ridges and rhomboid window openings. The greenhouse is slightly longer than the stores.

The stores form an unbroken row of single storey structures constructed of random limestone rubble with a slated roof. They are divided internally into small cells, most of which have a wide timber sheeted door and an 8/8 sash window set in rhomboid openings. Some cells to the east end have larger doors. Several cells open directly into the greenhouse. Two small rendered ridge chimneys project from the row, one roughly at the centre and one at the east end.

The greenhouse has a timber frame with a low brick base. The gables, sloping roof and vertical south wall are all glazed. A line of opening windows operated by a geared mechanism runs along the base of the vertical glazed section and the top of the sloped glazing. The interior contains a series of internal gables that subdivide the space into separate bays.

Cartographic and valuation evidence shows that a greenhouse existed on this site in the 1830s and was roughly the same length as the present structure, though broken into three sections of lower heights. The stores date to mid-19th century, being shown by 1858. The greenhouse in its present form is post-1858 and underwent major rebuilding in the 1990s. This restoration was carried out sympathetically using appropriate materials and techniques.