Snowdon Mill and Ty'r Felin

Snowdon Mill and Ty'r Felin are a large former mill complex, dating from the 19th century, comprising two parallel ranges situated on a sloping site.

The original front range, facing Snowdon Street, is constructed of large blocks of slate-stone rubble laid in rough courses, with a slate roof. The three-storey front elevation has windows grouped three plus four. A pebble-dashed lean-to obscures the middle-storey windows on the left side, with a lower weatherboarded lean-to on its right side. The windows are replacement small-pane and single-pane windows set in original openings; the three leftmost windows are smaller than the others. A repainted stone tablet inscribed 'RG BR AD 1862' is located between the second and third storeys. At the left (southwest) end is a slightly lower three-storey two-window house (Ty'r Felin) with pebble-dashed walls, a slate roof, a stack to the left, replacement windows, and an entrance on its right side.

The northeast gable end of the mill has an abutting wall of a former lower engine house at basement level, and a small-pane attic window. The rear of the front range and house have replacement windows. A boarded door is situated at third-storey level on the mill's rear. A short rear wing, originally linking the two ranges, has higher eaves, a lower ridge, a half-hipped roof, replacement windows, and a lean-to against the lower storey. A narrow weatherboarded link connects the wing to the rear mill range. A 20th-century flat-roofed link of cement render projects in front of the front range's gable end on the northeast side.

The four-storey rear range is slightly higher than the front range, with its ground storey at a lower level. Its southwest gabled front is rendered and painted, with a replacement door and enlarged flanking windows in the lower storey. Above are three superimposed boarded doors, each with a shouldered head, and a bracketed and gabled wooden frame indicating a former hoist, flanked by two-light casement windows in each storey, all within original openings. The six-window left (northwest) side is cement rendered, except for the rubble-stone basement, and features replacement windows. A blocked doorway is immediately to the left of a larger replacement window on the lower right. The three-window rear (northeast) gable end displays exposed slate-stone rubble, a replacement door in the basement flanked by windows (the right-hand window being blocked), and two-light windows in original openings above.

Internally, the floors are supported by cast iron posts made by J.H. Williams of Porthmadog, and retain trap doors.