St Catherine's House, including area railings

St Catherine's House is the left half of a pair of houses built in the 19th century. The exterior features painted stucco with slate roofs, end stacks, and a ridge stack. The house has four storeys, a basement, and an attic, with two windows on each floor. It has raised quoins and decorative bands above the ground, second, and third floors, with a parapet supported by paired plain blocks. Each house has two gabled dormers.

The upper floors feature four-pane sash windows, while the inner bay above the doors has windows set in rusticated surrounds. The entrance doors are two-panel with overlights. The outer bays have two-storey canted oriel windows with cornices, featuring 2-4-2-pane sashes on the first and second floors, and a broad tripartite 2-4-2-pane sash on the ground floor. The basement has a similar tripartite sash, although it has been altered on No 2.

The end walls and rear of the house are slate-hung, with the slate-hanging renewed in the late 20th century. The rear is slate-hung for the upper three storeys, with 12-pane sashes in the outer bays, and a projected section in the centre bays, presumably added to the upper floors. Dormers are located behind the parapet.

The area railings feature uprights with fleur-de-lys finials. Inside, there is an entrance hall with a staircase at the back, which has a thick bulbous newel.