Port Mary House

Port Mary House is a later 18th century building with 19th-century additions. It has two storeys, attics, and a basement, all featuring smooth rendering with polished raised margins. The main elevation has three bays with single-light 12-pane sash windows. The centre bay includes a full-height gabled projection from the late 19th century, made of bull-faced ashlar with smooth rusticated quoins and tripartite plate glass sashes.

The house has a moulded eaves cornice, skews, and skewputts, along with tall corniced axial end stacks that have octagonal flues. On either side of the house are piend-roofed single-storey and attic pavilions with Venetian windows, which are connected to the house by garden walls. The northern wall now forms part of a roofed corridor linking the main house and the pavilion. The southern pavilion features modern dormer windows.

The rear elevation is constructed of pinned rubble and includes a French door to the left, with other details matching those of the front. There are also a pair of canted dormers in the attics.