Trecastell Farm

Trecastell Farm is a late 19th-century farmhouse designed in an L-shaped plan, featuring a lean-to addition in the northwest angle and an advanced lateral stack at the southwest corner of the west wing. The building is constructed from roughly coursed masonry of large rubble, with boulders used as quoins and some sections rendered. It has a slate roof with stone copings and shouldered gable stacks with capping.

The main elevation faces east and consists of a two-storey, three-window range, with a narrow central doorway that has a shallow fanlight above it. The windows are hornless sashes with slate sills and flat arch voussoir heads; the ground floor windows have 16 panes, while the first-floor windows are unequal. The left (south) gable return is rendered, as is the first floor of the right gable return, which features a small ground floor casement window with four panes.

Access to the rear of the house is through a doorway located at the right (south) end of the lean-to addition. There is a small four-pane casement window to the left and a similar first-floor window above the doorway, with a four-paned horned sash window to its left. The north wall of the west wing has four-pane horned sash windows on each floor; the rendered west wall has a similar ground floor window, while the rendered south wall features an unequal first-floor sash window with twelve panes.

The house retains a plain wide segmental arch that leads to the original 16th-century fireplace, which is now filled in.