'Peach House' at Plas Llangattwg including attached former boiler-house

Peach House at Plas Llangattwg, which includes an attached former boiler house, is a 19th-century wrought iron-framed glass house set on a brick plinth, leaning against a rubble stone wall to the north. The west gable wall is made of masonry with a brick coping. The ironwork features a curved profile and is supported by iron ribs that extend from the top to the ground, following the shape of the structure. It has closely spaced diamond section vertical glazing bars, with most of the original glass still intact, and the panes overlap without horizontal bars. The east gable end of the glass house is also wrought iron, featuring uniform glass panes with both horizontal and vertical glazing bars. This end includes a half-glazed wrought iron door with 25 panes. The west masonry wall has a wood panelled door set within a doorcase, leading into the formal garden.

Behind the north wall is the lean-to boiler house, currently used as a garden shed, which originally provided heating for the glass house. It is constructed of rubble masonry and has a slate roof. The boiler house features a planked entrance on the east end and two 2-casement windows with quarries under segmental heads, complete with voussoirs and stone sills. There is a small blocked opening in the boundary wall of Plas Llangattwg for coal delivery. The dividing wall between the greenhouse and boiler house extends eastward and includes a square-headed doorway for access between the two spaces.

Inside, a row of slender cast iron columns supports the roof. There is a cast iron water tank and cast iron slats where heating once entered the building through underground pipes. The floor is tiled. The glass house remains in use for growing peaches and tomatoes.