Tan Rallt Wen

Tan Rallt Wen is a linear range of single-storey croglofft cottages, built upslope, featuring a boiling house on the left (north), a cowhouse, and ruined pigsties on the right (south). The structure is made of rubble masonry, with the front and side elevations limewashed, while the south end of the cowhouse is pebbledashed. The roof is covered with small slates and grouted. The cottage has rectangular gable stacks with capping, and the boiling house has a capped external stack at the north end. The cowhouse roof at the far south end has been replaced with profiled asbestos material.

The cottage has two windows and a doorway between them, with the openings offset to the right (south). The door is glazed, and the flanking windows are horned 4-pane sashes. The boiling house features a single window range with a door to the left; the window is a 16-pane hornless sash, and there is a small 2-paned sash at the rear. All windows along the range have slate sills.

To the right (south), at a lower level than the cottage, is a paired cowhouse range, each with a single doorway. The left-hand cowhouse has its doorway offset to the right, featuring a boarded door under a shallow overlight, while the right-hand cowhouse door is boarded and offset to the left. There is a narrow light set in the south gable apex, and at the rear, there are partially blocked openings. The left opening has a wide cart bay arch infilled with rubble and a boarded window to the right, while the right has a narrower doorway with a shallow small-paned light at the apex of the arch. Both arches have rough stone voussoir heads. To the right of the narrower doorway is a boarded loft opening in a raking dormer that breaks the eaves line.

At the far right (south) end of the range is a ruinous two-unit pigsty, which was formerly covered by a single pitched roof but is now roofless.

Inside the cottage, the space is open to the roof, which features pegged, chamfered, collared trusses. There is an inglenook with a large chamfered bressumer at the north end, infilled with brick and equipped with a cast iron grate.