Llanfythin Millhouse

The property comprises a millhouse and an associated mill range, dating to the 17th century with later 19th-century additions. The millhouse is constructed of lime-washed rubble with a slate roof and has two rendered stacks. The southwest gable end has two timber casements, one to the ground floor and one to the first floor. The eastern elevation features two windows to the first floor, and a gabled dormer breaking the eaves, with a hollow chamfered hoodmould and multi-paned two-light casements. A small timber two-light casement is located on the first floor to the west end. The western bay appears to be a later 19th-century addition. At ground floor, two casements are present: one a multi-paned two-light casement in an original opening beneath a hoodmould with a relieving arch, and one a modern three-light casement in a modified opening. A modern doorway is located at the west end, and a second square-headed door with a hoodmould (and a modern glazed door) is positioned at the eastern end. The northwest elevation is unlit.

The three-storey mill range is set at right angles to the cottage and features four multi-paned casements on the northwest elevation, arranged asymmetrically, along with a modern glazed door. The front (eastern) elevation is painted white and includes a modern ground-floor bay with a multi-paned two-light casement above. Beneath a projecting gabled canopy is a loft door opening, now glazed. The northeast elevation has a single window to the ground floor, two on the first floor, and one on the third floor. The rear (northeast) elevation of the gabled mill house range retains an iron overshot water wheel with timber paddles and a wrought iron superstructure, though it was in poor condition during an inspection in April 1995.

A 19th-century dairy room is attached to the southwest end of the 17th-century millhouse range. A hall cell contains an open fire with a stone lintel and a later timber fire surround, along with a direct entry stone stair to the north side of the fire. This stair has an original square-headed planked door and frame with an early fleur-de-lis pintel hinge. Inside, three exposed beams with a medium chamfer and hollow stops, fillet, and plain chamfered joists are visible. The floor is flagged but now concealed. Original planked doors are present, with a plain chamfer to the jambs and hollow stops. A northeast room has a large open fire at the southwest end, with a 20th-century bressumer. A 19th-century oven is located in the north jamb. A later 19th-century ceiling is present. A straight flight of modern stairs is located at the northeast end, positioned beneath which is the surviving mill wheel. This stair leads to the original mill room, which contains extensive surviving mill machinery in situ, including an axletree connecting to the water wheel, a pit wheel, a wallower, a spur wheel, and an attached gear lever acting on the main shaft. The first floor reveals exposed principal rafters with trenched purlins, with evidence of the eaves having been raised.