Pentwyn Farmhouse & attached Granary, Dairy, Cowhouse and Corn Barn

Pentwyn Farmhouse & attached Granary, Dairy, Cowhouse and Corn Barn

A large 18th-century farmhouse with attached agricultural buildings, forming an irregular linear range. The house is constructed of rubble stone walls with ashlar and brick dressings, beneath a slate roof hipped to the north-east with brick end stacks.

The north-west front is two-and-a-half storeys. The left side of this elevation displays exposed timbers built into the exterior stonework. The attic roof slope has two gabled dormers with 8+8 pane casements. On the first floor are two 16-pane sash windows with cambered brick arches, brick jambs and shallow stone sills to the left, and a smaller 2+2 pane casement with stone sill to the right. The ground floor has a corresponding 16-pane sash to the left, a blocked door opening with inserted 4-pane window at the centre, and a small lean-to porch with single light window to the right.

The garden front is three storeys and features ashlar quoins. Windows have cambered brick arches and shallow stone sills, with brick jambs to the ground-floor windows. The second floor has two 6+6 pane casement windows. The first floor contains three tall 20th-century casement-type windows with 3+3 panes. The ground floor is dominated at its centre by a 20th-century gabled wooden conservatory, flanked on each side by a 16-pane sash window.

To the right of the house, the north-west front has a projecting gable of the attached granary. An external stone stair winds to an upper boarded door. To the right of the door, a square stone stack with brick flue rises above a projecting bread oven. On the ground floor to the left is a glazed 20th-century entrance door serving the back kitchen.

To the right of the granary is an attached single-storey dairy and beast house. From left to right its elevation contains a 19th-century boarded door with 3 panes, a 6+6+6+6 pane casement window with stone sill, a boarded door with strap hinges, and a similar boarded door with rectangular 3-pane overlight.

Projecting to the right is a large attached corn barn. The central threshing floor has boarded doors. The long wall to the left has a tall vent slit. The wall to the right has a lean-to with corrugated metal roof and three boarded doors, one of which has vent slits.

Internally, a boarded door from the garden front opens into a lobby with a centre staircase opposite, separating the principal ground-floor rooms on each side. The parlour to the right has four massive, square-section, axial ceiling beams. The dining room to the left has a chamfered transverse ceiling beam. A 18th-century boarded door opens from the dining room into the back kitchen, which has chamfered ceiling beams with run-out stops.

An 18th-century straight stair with closed string features square newel posts with bead at the angles and waisted finials with domed caps, rectangular beaded balusters and a shaped rail. To the right of the stair is a former pantry. An 18th-century plank and batten door with applied fillets serves the first-floor bedroom. A winding staircase rises to a habitable attic of five bays. The roof has been raised, probably in the 19th century. The collar truss roof has unusual curved blades which run from the soffit of the collar to mortices in the top of the floor beams, with rafters on each side supported on raised blocking pieces.

The interior of the attached granary was not available for inspection at the time of survey in November 2000. The corn barn comprises six bays with a stone-flagged threshing floor and raking queen strut trusses with one row of purlins. At its lower end is a lofted cowhouse. The interior walls of the cowhouse have honeycomb pattern vent holes through the brickwork.