Mount Hamilton, St Quivox

Mount Hamilton is an 18th-century house, with significant remodelling around 1790 and later additions and alterations. It is a two-storey, three-bay house displaying late Georgian detailing. The exterior is harled with painted polished margins. A base course, strip quoins, eaves course, and eaves blocking course are visible. Piend-roofed rectangular dormers light the attic floor.

The northwest (principal) elevation is symmetrical, featuring a shallow bowed bay added around 1790. It has three regularly placed windows on both the ground and first floors, with a recessed dormer above. The southwest (entrance) elevation is asymmetrical, with two bays dating back to 1790 on the left side. A harled stair is centrally positioned, leading to a first-floor doorway with a three-pane fanlight. A doorway and window are located on the return at ground floor level under the stair, and regular window placement is seen in the third bay. A gabled bay from the 18th century projects to the right, heavily battered, with a window off-centre to the left and a window in the gablehead of the attic floor. The left return is mostly obscured by the stair, with a ground floor window visible.

The southeast elevation consists of a three-bay 18th-century block, symmetrical in design, with a single window on the ground and first floors of the central bay. This is flanked to the left and right by bipartite windows at ground floor level. A bipartite window is positioned to the right of the first floor, alongside a single window to the left. Three dormers are present in the attic floor. A single-storey and attic, two-bay wing is attached to the outer left, displaying regular fenestration.

The northeast elevation is asymmetrical. A gabled, single-storey and attic wing projects to the left, featuring a blank section, a window, a boarded timber door, and a dormer to the left return. A recessed two-bay block from around 1790 is seen to the right, with a ground floor window to the left and an iron stair leading to a first-floor window above and a canted dormer in the attic floor. A blind window is located on the ground floor of the bay to the right and a window is above. A canted dormer is in the attic floor. A single-storey, curved wing adjoins the outer right at ground floor level, rising in steps, with irregularly placed windows and doors to the left and right returns.

The windows are predominantly timber sash and case, with four panes and twelve panes. The roof is covered in grey slate with lead ridges and stone skews. Coped gablehead and ridge stacks incorporate octagonal cans, and cast-iron rainwater goods are in place. The interior was not inspected in 1999. The characteristic broad shallow bowed front, reminiscent of other country houses in Ayrshire, dominates the principal elevation and obscures much of the older building, which was originally the Auchincruive Estate factor's house. The house is depicted in Andrew Armstrong’s A New Map of Ayrshire from 1775, and later Ordnance Survey maps from 1860 and 1897. Historical details are further described in Michael C Davis's The Castles and Mansions of Ayrshire (1991) and Rob Close’s Ayrshire and Arran (1992). Photographic records are held in the NMRS Photographic Archive.