Penlan Fawr including forecourt, walls and railings

Penlan Fawr is a mid-19th century traditional gentry farmhouse constructed from snecked slate stone. It features a tall, pitched slate roof with stone end stacks at the gables and large quoins at the corners. The facade is two stories high with three windows, showcasing 12-pane timber sashes that have slate sills, cut stone voussoirs, and shallow reveals on both the upper and ground floors. The center of the ground floor has a wide, boarded timber door topped by a marginal glazed overlight. The left gable end has two arched-headed ground floor windows, which are likely later 20th-century replacements. The rear of the house has been altered and extended, featuring a single-storey roughcast kitchen extension on the right, which includes a 20th-century glazed panelled timber door and a large modern timber-framed window to the right.

In front of the farmhouse, there is a small enclosure with a dwarf wall made of coursed rubble, adorned with decorative cast railings. The railings have three-pointed spearheads, margins at the top and bottom, and scrollwork motifs. The gates match the railings and are hung on small cast pillars with pointed heads.

Inside, the farmhouse contains a large inglenook fireplace with a timber beam above, which is dated 1869.