Castleton Mill

Castleton Mill is a steam-powered flax-spinning mill, built in 1838 with later 19th-century additions. It was designed by Matthew Murray, with further modifications made by J.M. Fawcett in 1884. The mill is constructed of red brick in English garden wall bond, with a slate roof, and stands four storeys tall with 18 bays. A chimney is located at the northwest end, incorporated into a later two-storey extension.

The main range features an ashlar plinth and small-paned wooden cross windows set in openings with slightly cambered brick arches and projecting stone sills. There are various doorways and pentices, along with a three-storey bow at the northwest corner. A full-height projecting bowed stair turret is located at the southeast gable, which includes a ground-floor doorway and three windows on each floor, flanked by blind windows in the end wall of the main range, topped with a hipped roof. The northwest end has an extension with stone-coped twin gables, featuring an oculus at the apex of the southwest side, a bellcote on one gable, and a finial on the other. Rising from this is a tapering octagonal chimney.

Inside, the first three floors have a central row of circular cast-iron columns supporting inverted T-beams that carry brick-arched fireproof floors, with wooden roof trusses above. The mill originally housed a beam engine by Fenton, Murray and Wood at the northwest end. Initially built for flax spinning, a weaving shed was added by the 1850s, and after the early 1860s, it was primarily used for linen and woollen manufacture. Part of the complex has been demolished.