Cow Shed at Ynysmaerdy Farm (formerly stores of Llantrisant Colliery)

The stores is a single-storey gabled building in coursed rubble sandstone with red brick dressings. There is a slate roof with sawtooth terracotta ridge tiles and former glazed rooflights now replaced by corrugated iron sheets. The building is 8 bays long, the penultimate bays at each end to the front (E) elevation containing doorways. To the R of centre the window has been removed for double doors beneath a small opening, possibly for a winding cable. The windows have segmental heads with deep, dentilled surrounds and pronounced keystones, all in red brick, in typical Powell Duffryn house style. They have metal frames, 6 panes by 6. Red brick has also been used for the quoins and a deep eaves cornice.

The interior has remains of a spine wall and joist holes for a first floor, both of which appear to have been inserted after the original construction of the building.