Treviades Barton Including Garden Area Walls Adjoining South

House, formerly a farmhouse. Built in the late 16th century and remodelled in the late 18th century. The building is constructed from granite rubble with dressed granite quoins, lintels and chimney stacks. The roof is slate with gabled ends; the left (west) and right (east) ends are slightly lower and have grouted scantle slates, while the rear range has a half-hipped end to the west. Two dressed granite axial stacks and one stack at the left gable end all have moulded caps and drips; the right end stack was rebuilt in red brick. The rear range has a gable end stack to the right and two rear lateral stacks, the one to the left being very large with slated set-offs.

The house follows a courtyard plan with a parallel kitchen service range at the rear (north) linked to the main front range (south) by a short rear right-hand wing to the east and a wall which forms the fourth side of a small courtyard. The main front range was altered in the late 18th century when it contained four rooms, with the two centre rooms separated by a central cross-passage leading from the front doorway to a stair hall at the back. The passage partitions were removed in the 20th century to form one large central room with a fireplace at each end. The two end rooms occupy the full depth of the front range and each has a gable end fireplace. At the back of the left-hand (west) room there is what may be a blocked stair tower or perhaps a smoking chamber. The rear kitchen-service range has a large fireplace at the right (east) end and two other lateral stacks at the back.

The south front of the main range is two storeys high, five windows wide and asymmetrical. The central three-window range has raised eaves. The windows are late 19th or early 20th century sashes with vertical glazing bars only and granite lintels and quoins. The ground and first floor of the right-hand end of the front has original three-light chamfered mullion windows with later casements. The central doorway has a late 19th or 20th century gabled porch and 20th century glazed door. The rear (north) elevation of the main range facing the courtyard has a small gable to the right which may be a stair turret or perhaps smoking chamber, and a multipane stair window to the left. The south front elevation of the back range has asymmetrical fenestration of sashes and casements, and to the right on the first floor an early 19th century 19-pane horizontally sliding sash. The rear (north) elevation of the back range has two lateral stacks; the one to the right projects and is very large with slated set-offs.

The site includes granite rubble walls to the south enclosing a small garden in front of the house. The south wall is a lower retaining wall ramped up at either end to taller side walls which are attached to the house. The west side wall has a gateway with a chamfered granite lintel, and there is a granite mounting block on the west gable end of the main range. The wall on the west side of the courtyard has a doorway with a chamfered granite lintel.

Internally, the central cross-passage partitions have been removed to form a long central room which has fielded dado panelling and a chimney-piece at the left end with a dentilled cornice, urns and festoons and flanking alcoves with shaped shelves. Similarly shelved alcoves flank a 20th century chimney-piece at the right end. The smaller but full depth east room has closely spaced chamfered ceiling beams. The west room, similar in plan, has been stripped of plaster exposing stone walls and ceiling joists. The fireplace in the west end wall has a square-section granite lintel, and to its right the former stair turret (or smoking chamber) doorway is blocked. The stairhall behind the central room contains some possibly reused early 17th century panelling with a fluted frieze and moulded cornice. The 18th century open-well staircase has an open string, turned balusters, square newels with moulded caps and moulded handrails. The rear service-kitchen range has a large open fireplace in the east gable end with granite jambs and a large unchamfered timber lintel and a floor laid with granite setts. The house has been very little altered since the 18th century and most of the 18th century joinery remains intact including fielded two-panel doors and moulded doorframes. Many of the moulded cornices survive.

The roofs over the main range and the rear right-hand wing are probably 18th century, having straight elm principal rafters crossed at the apex with collars lapped, pegged and nailed to the face of the principals. The roofs over either end of the main range have been replaced in the 20th century with soft wood trusses. The roof over the back range has a nailed soft wood structure.

Treviades was held by the Treviades family until about 1320 when it passed to the Trefusis family who held it until 1920 and probably built the existing house in the late 16th century. The 18th century remodelling was probably carried out for the Symons family who held the farm on a lease at the end of the 18th century.