Pant-yr-Ynn Mill

Single-storey rubble building with large waterwheel to S and later 2-storey addition to N; modern slate roofs with continuous skylight to mill section and oversailing eaves. 5 large 30-pane windows to the long W side of the mill (of which 2 are modern replacements). E side partly built against the hill with reduced entrance towards S; chamfered C19 doorcase and boarded door; large slate-stone lintel. 2 further (blocked) entrances to R beyond. Small slate-flagged yard to northern part. Original arched entrance to N gable discernible from within though now hidden externally by the addition. This has a stepped-up first-floor catslide bay with continuous modern glazing. Modern multi-pane windows and plain bargeboards to gable end; this with boarded entrance doors.

External overshot waterwheel (7m diameter) served by the Afon Du and via a raised leat carried on a slightly tapering rubble pier; wheel and leat restored.

Suspended and boarded C19 pine floor to mill section. 4-bay roof with king-post trusses (c1881). This carries the complete original overhead transmission shafting mechanism with 16 separate wheels, formerly driving the machinery with belts.