Pen yr Allt

Pen yr Allt is a Grade II listed building that originally consists of a two-storey cottage with a single-storey, hipped-roof wing to the right, which was formerly a brewhouse. At the rear, there is a lean-to extension with a catslide roof over a single-unit pigsty. A picturesque wing, symmetrically planned, was added against the left gable and includes a small single-storey 'cottage' flanked by two circular blocks. The walls are made of rubble and are now rendered, with a slate roof and octagonal stone stacks.

The main part of the building features an entrance through a four-centred voussoir arch in a lean-to porch to the left, positioned at the angle with an advanced circular bay. To the right, there is a lower-storey 12-pane sash window and an upper-storey window that is a two-light, mullioned and transomed design with small panes. The right end has paired octagonal stone stacks, with a stone fence post serving as a finial to the left. The bay to the right has a single octagonal stone stack at each corner and an elliptical arch over a modern window at the right end.

The 'cottage' wing to the left is also symmetrically planned, featuring a central porch with a four-centred voussoir arched entrance, flanked by elliptical arched recesses, each containing two-light, 8-pane side-hung casement windows, with a single stack to the right. This wing has circular bays at either end, each with projecting chimney breasts and a single two-light, 8-pane casement window.

Inside, the sitting room contains a marble fireplace, which is locally reputed to have come from Plas Newydd.