Trebinshwn house and attached stable wing

Trebinshwn is a large Regency mansion created by remodelling an older building, with an attached stable wing. The house presents a roughly E-shaped plan with an added wing to the north.

The main frontage is constructed of stone rendered to the front, with a Welsh slate roof that is shallow pitched with hipped cross gables and wide, shallow stone lateral stacks; further stacks rise to the rear. The frontage is nearly symmetrical at two storeys, with balancing projecting wings on either side—the left wing is slightly wider. The central range contains three windows, with the centre bay breaking forward slightly. Sash windows throughout have 3/6 panes to the first floor and 6/6 panes to the ground floor, with narrow glazing bars, set in reveals with shallow sills. A string course runs at parapet level, and the parapet steps up over the centre bay. The central doorcase features brackets supporting a pediment, fluted pilasters, panelled reveals, and a 6-panelled door with a Gothic glazed overlight set in a recess. On each side, shallow wings project outward with channelled quoins and 2-storey canted bays containing similar windows on three sides. The right bay is flanked by narrow ground floor 4/4 pane sash windows.

The side wing extending left (south) contains a 3-window range of 3/6 pane horned sashes to the first floor and 6/6 panes below, set within brick segmental arches and surrounds. A narrow door with vertical panelling and a 6-pane overlight opens from this elevation.

The rear elevation is of stone, formerly lime-rendered, and displays the E-shaped plan with three cross wings. The right (south) wing is hipped, while the left (north) wing extends further and steps down. Chimneys flank the gable ends of the cross wings, with two additional end stacks to the right wing. The central staircase wing features a large Venetian window with a smaller round arched window above it containing Gothick glazing. Most windows in the rear range have segmental arched openings, some with brick dressings. The left (north) wing retains two 17th-century windows with timber mullions. The right side elevation displays a similar range of 3/6 pane sashes to the first floor and 6/6 pane sashes to the ground floor, with a side entrance.

The attached stable wing to the right is constructed of rubble with a stone tiled roof and an end stack. A central gable contains a stone staircase ascending to the loft. At ground floor level, a range of segmental arched doorways and 4-pane casement windows with voussoirs and narrow sills open onto the courtyard, with a round arched recess below the steps. The stable courtyard is bounded to the front by a stone rubble wall.

The entire complex is enclosed by a curved retaining wall fronting the lane, with ashlar gate piers marking two drive gateways on either side.

The interior retains much high-quality plasterwork and joinery throughout. Panelled shutters, 6-panelled doors with wide moulded surrounds, fireplaces, and floorboards are almost entirely retained.

The drawing room to the right features deep panelled reveals and shutters to the bay, with some original plain glass in the windows. A decorative plaster scroll ornaments the space above the door, and a highly decorated carved leaf and fruit Rococo fireplace surround commands the room.

The hall ceiling displays two rectangular panels with oval mouldings and a moulded plaster frieze featuring emblems of feathers and animal heads in alternating medallions. A dado panel, small fireplace, and a plaster shell-moulded recess with flanking fluted pilasters complete the space. A basket-arched hall arch with panelled soffit and fluted pilasters leads to an open well staircase with a very wreathed handrail and slender turned balusters. The decorative treads are complemented by a second ramped handrail set against the wall, supported by narrow pilasters. The staircase ascends two storeys and is lit by a Venetian staircase window enriched with panelled reveals supported by pilasters, topped by an entablature with a frieze of triglyphs and roundels.

An intermediate small sitting room contains an early 19th-century firegrate decorated with Classical motifs.

The dining room features a ceiling with oval plaster panels and a foliage frieze with billet moulding above. A bracketed fireplace, panelled bay with fluted pilasters and a roundel frieze, and a decorative doorcase with an adjacent display recess all display Classical detailing.