Plas Derwen

Plas Derwen is a cottage ornee style building, constructed with roughcast render over stone on a stone plinth, and topped with slate roofs. The house is symmetrical in design, featuring a central entrance that faces east. It stands two storeys high with two parallel ranges, each having wide, slightly advanced outer gables and paired axial stacks, which have mostly been renewed in brick.

The entrance front has a three-window range, with a central gabled porch that features a four-centred arch. This porch is flanked by small fixed light windows with small panes. Above the entrance, there is a two-light gabled dormer. The gables on either side have tripartite wood mullioned and transomed windows with small panes and drop-ended hood-moulds on each floor, with metal glazing bars on the first-floor windows. The bargeboards of the gables, dormer, and porch are decorated with fretted guilloche patterns and pendant finials.

The north front is also symmetrical, with slightly advanced gables flanking a narrow central bay. It features similar small-paned three-light mullioned and transomed windows with hood moulds on the ground floor in the gables, while the two-light upper windows have shaped hood moulds that echo the angle of the gables. The central bay contains two-light windows. The west elevation mirrors the entrance front and is detailed in the same manner, with all gables showcasing enriched bargeboards and all windows featuring small panes.

Inside, the house has a wide central entrance hall, which includes a cantilevered staircase with thin spindles. Some slate and marble fireplaces remain in place.