Allt Fadog is a two-storey, whitewashed rendered house with seventeenth century origins. It has a slate roof and three brick stacks. There is a long four-window front comprising of the three-bay main house to the left and a single bay service section to the right. It has horned sash windows and slate sills. The left end gable was partly rebuilt in brick in the twentieth century. Attached to the rear right is a large lofted outbuilding of whitewashed rubble with some earth walling, running back into the bank to the North.

It is included as a farmhouse with attached farm ranges of C18 or earlier origins, and for special interest as the home of Lewis Morris.

Source:- Cadw Listed Buildings, NJR 26/08/2009