West Block, Kelburn Country Centre, Kelburn Castle, Fairlie

West Block is a single-storey former home farm complex dating from around 1760, set on the south approach drive to the southwest of Kelburn Castle. It was originally arranged as three blocks in a U-plan, with the principal elevation facing west, and contained a steading, stables, dairy, byre and offices. Between 1979 and 1980 the complex was remodelled to serve as the visitor centre for Kelburn Castle Estate.

The symmetrical west elevation presents a five-bay central block flanked by single-bay ends of the north and south blocks. All three blocks share a consistent architectural treatment: channelled ashlar piers with ball finials at the corner angles, arched openings with keystones, raised margins, and piended (hipped) roofs. 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, with the north and south ranges stepping up the slope of the site; windows facing the courtyard are timber-framed with mostly small-paned glazing and irregularly arranged openings. A piended roof cottage addition to the east of the south block was added around 1880. All roofs are finished in grey slate.

The interiors, partly inspected in 2016, have been largely remodelled as part of the conversion to a visitor centre, though some internal fixtures and fittings associated with the original stable and home farm use survive within the outer ranges.

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

Kelburn's former home farm is a good surviving example of farm buildings developed during the early phase of agricultural improvement in Scotland. The unified classical form of the range survives largely intact, with the channelled ashlar pilaster quoins and large ball finials at the corner angles contributing particular architectural interest. The building sits prominently on the principal south approach drive to Kelburn Castle, a route established in the late 18th or early 19th century, and it remains a key component of the designed estate landscape.

The mid-18th century saw sweeping changes in farming methods and animal husbandry across Scotland and Britain more broadly, leading to new, ordered approaches to farm building layout. As architectural historian Miles Glendinning has observed, the planning of farm buildings during this period was influenced by "the desire for classification and order stimulated by the Enlightenment." Among the grandest examples of this movement in Scotland are the Great Barn complex of around 1750 at Inveraray Castle, Argyll, and the Culzean Castle Home Farm of 1775. The economist Adam Smith, writing in 1759, noted with some scepticism that many large estate landowners were "cultivating small areas around their country seats and attending more to ornament than to profit" — reflecting the dual practical and aesthetic ambitions that shaped buildings of this kind.

The Kelburn home farm, built by an unknown architect, is a relatively modest example in terms of scale, but representative of the type. Its symmetrical, pavilion-flanked U-plan layout with pyramidal roofs embodies the classical design ideals of the period. The flanking ranges housed stabling, a coach house, a dairy, and possibly a laundry and servants' accommodation, arranged around a central courtyard. The principal west-facing elevation, with its channelled corner piers and ball finials, was expressly designed to complement the setting of the castle, which had recently been extended in the early 18th century. The channelled corner pilasters with ball finials are consistent in style with the gatepiers found 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 setting 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 demonstrating the transition from the medieval tower house tradition towards the classically inspired, non-fortified domestic architecture of the Renaissance. Its successive phases of addition, from the early Scottish Renaissance to the present day, reflect changing political and cultural values and a significant transition in Scottish domestic architecture. Associated ancillary estate buildings and structures — including home farm offices, sundials, monuments, lodges, bridges and workers' cottages — contribute to understanding of this historically significant ancestral seat.

The home farm range was previously listed under the name "Kelburn Former Stables and Cottages (Visitor Centre)." The statutory address and listed building record were revised in 2016.