South Block Cottage, Kelburn Country Centre, Kelburn Castle, Fairlie

South Block Cottage is part of a single-storey former home farm complex dating from around 1760, situated on the south approach drive to the southwest of Kelburn Castle. The complex originally served as steading, stables, dairy, byre and estate offices, and was remodelled in 1979–80 for use as the visitor centre for the Kelburn Castle Estate.

The complex is arranged in a U-plan of three blocks, with the principal elevation facing west. This west elevation is symmetrical, with a five-bay central block flanked by single-bay ends of the north and south blocks. All three blocks share the same architectural character: channelled ashlar piers with ball finials at the corner angles, arched openings with keystones, raised margins, and piended (hipped) roofs covered in grey slate. To the rear, the east elevation of the central block features a forestair and a pedimented loft door. The courtyard-facing elevations are mostly harled (roughcast rendered), with the north and south ranges stepping up the sloping site; windows facing the courtyard are mostly small-paned, set in timber frames, and irregularly arranged. A piended roof cottage addition to the east of the south block was added around 1880.

The interiors were largely remodelled during the conversion to the visitor centre and retain only some original fixtures and fittings within the outer ranges, as observed during a partial inspection in 2016.

The excluded from the listing, in accordance with Section 1(4A) of the Planning (Listed Buildings and Conservation Areas) (Scotland) Act 1997, are: additions to the north block and buildings to the east of the courtyard.

The former home farm at Kelburn is a good surviving example of the early phase of agricultural improvement in Scotland. The mid-18th century brought widespread change to farming methods and to the design of farm buildings, which were increasingly laid out on ordered, symmetrical plans — an approach shaped by Enlightenment ideals of classification and order. Some of the grandest model farm complexes of this era are found on Scottish improving estates, such as the Great Barn complex of around 1750 at Inveraray Castle, Argyll, and the Culzean Castle Home Farm of 1775. The Kelburn example is relatively modest in scale, built by an unknown architect in a simplified classical style. Its symmetrical, pavilion-flanked U-plan with pyramidal roofs reflects the architectural ideals of the period, combining practical use with a deliberate visual statement of a modernising landowner's intentions. The flanking ranges contained stabling, a coach house, a dairy, and possibly a laundry and servants' accommodation arranged around the central courtyard. The principal west-facing elevation, with its channelled corner piers and ball finials, was designed to complement the castle, which had been extended in the early 18th century; the style of the channelled corner pilasters with ball finials is consistent with that of the gatepiers elsewhere on the Kelburn estate.

Kelburn is among the oldest ancestral country seats in Scotland to have been continuously inhabited by successive generations of one family. The Boyle family (formerly 'de Boyville') have held Kelburn since the 12th century. The castle occupies a prominent coastal position to the south of Largs, with views across the Firth of Clyde to the Isles of Cumbrae and Bute and southwest to the Isle of Arran. The Kel Burn runs through the estate, passing through a wooded ravine and over a 15-metre waterfall to the southwest of the castle. Like Stair House in Ayrshire and Blair Castle in Perthshire, Kelburn Castle is a multi-period building that illustrates the transition from the medieval tower house tradition towards the Renaissance fashion for domestic, non-fortified, classically inspired buildings with formal suites of rooms. The home farm complex, along with other associated estate structures including sundials, monuments, lodges, bridges and workers' cottages, contributes to the understanding of this historically significant ancestral seat.

The home farm continues to occupy a prominent position within the Kelburn Castle policies on the principal south approach drive to the castle. The unified classical form of the building range survives largely intact, and the channelled ashlar pilaster quoins and large ball finials at the corner angles remain a notable architectural feature. The record was previously held under the listing name 'Kelburn Former Stables and Cottages (Visitor Centre)' and was revised in 2016.