Ty Brethyn

Ty Brethyn is a three-storey, four-window-range building, likely dating from the 18th century. It is largely whitewashed rubble construction with some brick infill, slate hanging to the gable apexes, and a later brick outshut at the rear. The roof is slate-covered, featuring overhanging eaves and later 19th-century brick chimneys on the left-hand gable and centrally. A significant division within the building is marked by the central chimney, separating what was originally a mill section to the right and a domestic section to the left, although this functional division may have come about through 19th-century modifications. A lofted, single-storey stable with a broad gable projects from the right-hand section, featuring outer doors and a small central window with a loft opening above.

The building incorporates two iron brace plates, one featuring fan-like decoration. A large overshot cast-iron water wheel, now in poor condition, remains against the right-hand gable, partially housed within a roofless brick lean-to. The wheel was fed by a leat, the remains of which are still visible at the rear. A tall, cambered-headed doorway in the right-hand gable, formerly accessed by a ramp, now has steps leading to it, and provides access to the mill area.

The domestic section to the left has a two-window range with a near-central doorway. The door and window immediately to the left appear to have been inserted into what may have been a larger original opening, though the windows generally align. The 3-light wooden casements previously recorded have been replaced with 2-light UPVC windows, set within the original window openings and with brick sills.

The interior of the domestic section suggests a late 19th-century date, potentially indicating remodelling during that period. The layout of the mill section is largely obscured by more recent alterations; however, a cast iron pit wheel survives alongside the right-hand gable end.