Chaff mill and carthouse at Cwmannog

The chaff mill and carthouse at Cwmannog is a building from the late 18th century or early 19th century. It consists of two adjoining sections: a two-storey chaff mill on the left and a single-storey carthouse that is flush with it, though its roof is slightly lower. Both sections are constructed of rubble, with the chaff mill featuring an old slated roof and the carthouse having a roof covered with small slates and a boulder plinth.

The chaff mill has a single square window opening in the center, with two similar windows above it beneath the eaves. These windows have pegged wooden frames and internal boarded shutters. On the left side, there is a large, later 19th-century rubble buttress. The left gable end of the mill features a large overshot waterwheel made of iron and timber. There is a central upper entrance with a catslide dormer roof at the rear and a boarded door. The carthouse has a plain entrance on the road-facing side and a large, plain cart entrance on the right gable end.

Inside the mill section, there is a two-bay roof with a crude collar truss. A late 19th-century or early 20th-century chaff cutter by Bamford is still in place on the upper floor and can be operated by both the mill wheel and manually.