Llwyn Onn Bach Farmhouse

Llwyn Onn Bach Farmhouse is a single-storey vernacular cottage built of rubble, likely dating from the late 17th century. It is partly set on boulder foundations and is oriented east-west into the slope of the hill. The cottage features an old, heavily-grouted slate roof with rubble gable parapets. At the west end, there is a large projecting gabled end-stack with weather coursing. The south roof pitch has a single small modern skylight.

The central entrance on the south front has a modern part-glazed door. Flanking the entrance are four-pane slightly-recessed casements, with the left window set in a reduced embrasure. There is a later stone bench beneath the right window and a short section of rubble wall extending southwards. The east gable end features a large stepped plinth, a small modern picture window to the left, and small original lights to the right and above, with the upper light being a four-pane casement. Inside, there is a rough inglebeam in the fireplace and three crude collar trusses.