Plas Towerbridge including L-shaped Outbuilding to SW

This is a two-storey former gentry house, predominantly constructed of whitened brick with slate roofs and plain bargeboards. The house likely dates to the late 17th or early 18th century, probably originally forming a U-shape. A large, storeyed and gabled central projection was added in the late 19th century, filling a gap between the original, smaller flanking gabled wings. A further, broader gable was raised behind this projection, featuring a prominent brick chimney. Early 20th-century wooden cross-windows are set into both floors of the central and flanking gabled bays, with small-pane glazing to those on the front and plain glazing elsewhere. The right-hand (north) gable end has a main entrance to the left of the chimney breast, with original bricked-up cross-windows to the right on both floors. A late 19th-century gabled porch with latticed wooden sides shelters a late 17th or early 18th-century studded and boarded oak door. The south gable end features a similar blocked window to the first floor and a 20th-century lean-to extension to the ground floor, with modern windows and a corrugated iron roof. The west side of the house is rendered and has three modern wooden cross-windows on each floor, with an entrance doorway contained within a covered passage in the final bay; this passage is formed by extending the roof of an adjacent L-shaped outbuilding over the narrow gap between it and the main house.

The adjoining outbuilding is two storeys high, with the front section built of whitened rubble and the rear arm of whitened brick, both under a slate roof. The north side features a boarded door and plain-glazed 2-light windows on both floors. To the right is a half-turn stone and brick stair leading to a boarded first-floor entrance, recessed beneath an oversailing gable supported by a brick-infilled, timber-framed parapet with three wooden posts, creating a type of open loggia. The timber-framed sections of the outbuilding are likely from the 17th century and may have been re-used from the main house. A deeply-recessed 2-light window is located below the stair parapet, and previously served as an entrance.

The ground floor of the main house has been re-partitioned in the late 19th and 20th centuries, making the original layout unclear. A painted oak staircase, originally of the "well" type, now features a single straight flight; it has a short galleried landing with flat, shaped and pierced balusters and square newels (without finials). The house retains ogee-stopped-chamfered main beams of a late 17th or early 18th-century style, and two contemporary 2-panel doors on each floor. There is also some old oak floor-boarding on the first floor. A 17th-century boarded cellar door leads to a quarter-turn wooden stair, and the cellar has a beamed ceiling.