Riverdale House And Adjoining Outbuilding And Walls

Riverdale House is a house, built around 1860, and now used as offices. It is constructed of rock-faced stone with ashlar dressings, featuring gabled and hipped slate roofs with fish scale bands and finials. The building displays a Gothic Revival style.

The exterior features a moulded plinth, a string course, and traceried arch braced bargeboards in a variety of patterns. The house is two storeys high plus garrets, with five bays. The central projecting gable has a two-light window within a segmental pointed surround, complete with a central shaft. Below is a half-hipped porte-cochere with an iron crest to the flat roof, supported by grouped wooden posts with shaped braces, and a two-leaf glazed door with sidelights and overlight. To the left of the central gable is a two-storey transomed double lancet stair window with two small single lights below. To the right, there is a double and a single lancet window, and above, a through-eaves dormer with a single lancet. Beneath, a double and a single plain sash window. Further to the right is a gabled wing, the left one larger and blind, and the right one with two plain sashes on the second floor. Both wings have external stacks. The left return has, to the right, a two-storey canted hipped bay window with three plain sashes above and three lancets below. To the left of this is a balustraded extruded corner with three plain sashes and below, a half-glazed door with a stone traceried fanlight. Above, to the right, is a plain sash and a single lancet. The garden front has a through-eaves dormer with a triple sash window in the centre, flanked by a lancet to the left and a plain sash to the right. Below, to the left, is a large buttress, flanked by a sash and two double lancets. A smaller left gable has a buttress supporting a canted stone oriel window with a hipped roof and crest, above which is a double sash. The right gable features a canted hipped two-storey bay window with a crest, incorporating three plain sashes above and three lancets below, with a single lancet above. The rear of the building includes an adjoining single-story outbuilding with five windows and an octagonal gable stack. A large, off-centre through-eaves dormer is also present. A coped linking wall with a segmental pointed gateway under a shouldered gable connects structures. The interior was not inspected at the time of listing. Group value is evident in its architectural detailing and historical context.