Pentwyn Farmhouse

Pentwyn Farmhouse is a long, five-unit range of buildings, likely dating from the 17th century, with additions and alterations spanning subsequent centuries. The exterior is rendered and painted over what is probably local sandstone rubble, with Welsh slate roofs, some of which are asbestos. The building is now mostly two storeys.

The left-hand section appears to be a former store, followed by a lower section, the original farmhouse, an added kitchen, and a probable granary, all now incorporated into the dwelling. The two-bay store has modern three-light casement windows and a lean-to on the ground floor. The lower end features a door leading to a cross-passage, alongside late 20th-century replacements including a three-light lattice casement and three two-light casements with ovolo mullions above. A small stack is on the left gable. The original farmhouse section has a 19th-century three-light casement set under an elliptical arch, with a late 20th-century lean-to on the ground floor incorporating French casements and two-over-two pane casements above. The main stack on the left gable has been heightened in brick. The added one-bay kitchen has two-over-two casements on both floors, with another stack external to the right gable, also heightened in brick, and a blind gable end.

The rear elevation reveals a deeper plan to the original house, which projects forward. The kitchen has a ground-floor window only. The original house displays 20th-century steel casements on the ground floor and 19th-century-style two-over-two timber casements above. A stair wing projects to the right and has blocked 17th-century windows on the upper floors; the ground floor is obscured by a modern gabled extension, which contains the rear door to the cross-passage and partially masks the lower end, featuring a four-light replacement oak casement and a single-light window above. A projecting gabled wing of the store building has a three-light casement on each floor, with further casements on the rear wall. A single-storey garage abuts the south gable.

The interior retains few original features. The cross-passage openings are framed with railway sleepers. A spiral staircase, originally to the right of the chimney, has been replaced multiple times, currently with a steel spiral staircase in another location. One original fireplace survives, with monolith jambs and an oak lintel. An oak post-and-panel partition remains opposite this chimney, although the doorways are missing. The roofs are largely obscured, with the exception of a 19th-century light, staggered purlin roof over the store added to the lower end.