Former Hospital and boundary walls

Plain classical-style 2-storey, 3-bay centre section with flanking single-storey 3-bay wings. Snecked rubblestone with tooled granite quoins, door and window surrounds with keystones and chamfered plinth; slate roofs have deep bracketed eaves, plain bargeboards and integral end stacks with tall octagonal stone shafts, in groups of 4 to main range and single to wings. Main range has cross gable with simple finial and blind attic roundel. Recessed horned 16-paned sash windows and central entrance with panelled half-glazed doors. Slightly set back to either side the single-storey 3-bay ranges also have 16-paned sashes, those to right section unhorned; panelled basement door in gable end of left section. Rear elevations of both side ranges have roundels and sash windows; lean-to at rear of left range with sash windows on right. Cross range on rear of centre range has small-paned sash windows and panelled doors to each side and round-headed windows to its rear gable end. Retaining boundary wall to front forecourt has iron railings with spearhead finials; high revetment wall at rear.

Museum interior displayed and interpreted to public as C19 quarry hospital. Half-glazed inner doors in central hall within a classical pilastered frame. Original twin porcelain basins in operating theatre have brass taps and much of the functional furniture was made in the quarry workshops. Relocated slate fireplace with astrological carving by Thomas Jones is dated 1837. Arched opening off central corridor.