Mount Stuart House

Mount Stuart House is a late 18th-century building constructed in a Free Classical style with Dutch influences. It is a three-story and attic structure, predominantly of red brick with extensive Bathstone dressings. The ground floor features channelled dressed stone, and a red brick plinth. The windows are sash windows without glazing bars. The first and second floors are punctuated by giant order pilasters with enriched capitals. Prominent cornices run along the ground and second floors.

The eight-bay elevation facing Mount Stuart Square displays a near-symmetrical design, with three attic gables; the central gable incorporates a stone frontispiece featuring octagonal colonettes and a broken pediment, with strapwork enrichment above the paired windows. Flanking oculi are present, along with broad stone chimneys with panelled fronts that extend down as panelled pilasters below the cornice. The end gables of the attic have paired round-headed windows and a central colonette similar to that of the central gable. Corner pilasters rise to form finials with semicircular caps. Architraves define the first and second floor windows; the first floor features additional enrichment including pediments and bracket dentil cornices, while the outer bays have Renaissance-style panelling and volutes between the first and second floors. A round-arched main entrance is located at the extreme right end, featuring a deeply bracketed and inscribed entablature, with a dentil cornice, pediment, volutes, and stone ornament above the double doors. The ground floor windows have high upper sashes with undulating aprons and channelled voussoirs; one window has original frosted lettered glass.

The four-window west elevation towards James Street exhibits similar detailing to the Mount Stuart Square facade. The central windows are paired with flanking giant order pilasters; all first-floor windows are pedimented, and oculi flank the central attic gable. Another window with frosted glass is present. The right-hand side, facing the chapel, is of stock brick and features camber-headed four-pane sash windows. Rear fenestration dates to the 1930s.

Inside, a wooden Jacobethan staircase is a prominent feature. The board room on the first floor has three windows overlooking James Street and two overlooking the entrance lane to Mount Stuart Square. It features panelled doors, and doorways with cornices incorporating pulvinated friezes. The room has painted wood panelling approximately 2 meters high, a plaster frieze with moulded floral decoration, and a ceiling in a late 17th-century style featuring moulded fruit and garlands. A west-facing office also has a window to James Street, and incorporates a ceiling in a 16th-century style with fretwork.