Cil-cewydd Corn Mill

Cil-cewydd Corn Mill is a five-storey building constructed of brick laid in English bond, featuring locally sourced siltstone dressings that are hammer pitched and margin dressed. The building has a flat roof, which was formerly pitched, and is topped with a brick parapet. It consists of an earlier north-south block with six bays and a later lower rear wing, also with six window bays, both covered by slate roofs. The main entrance is located in the east bay of the main block and features a round-headed opening with stepped and coursed hammer dressed voussoirs. The windows throughout are segmentally headed with rock faced stepped heads and contain 15-pane iron lights, with the central four being pivot hung. Each gable end has loading doors on every floor, some of which have been later widened, and there is a steel hoist arm at high level. Above the fifth floor, there is a heavy dentilled cornice with a hammer dressed frieze, topped by a brick parapet that has been raised by 2 meters at the southeast end to conceal enclosed roof tanks.

The added rear block, which is adjacent to the railway line and a dry watercourse, features two parallel roofs that form twin gables at the north end. The re-entrant angle between the two ranges has been built up with various lightweight cover buildings. Externally, the original circular iron wagon turntable remains near the east side of the main block.

Inside, the ground floor is made of concrete and has access traps leading to two late 19th-century MacAdam turbines located below, connected by a fireproof spiral stair. These turbines are the only original mill fittings still in existence and are horizontally set with bearings that are said to be floated in mercury. Made in Belfast, these turbines may be the only surviving examples of the 'improved' Macadam type. The rear added block features cast iron reinforced roof trusses and heavy central stanchions.