Northern Range, Farmsteading, Auchentullich Namoin

The South Range of the Farmsteading at Auchentullich Namoin dates back to 1858 and includes some stone from an earlier building. It is a two-storey, three-bay farmhouse with outbuildings that form a U-shape at the rear. The structure is built from squared sandstone rubble, featuring ashlar margins and dressings. Notable architectural details include a base course, Tudor hoodmoulds, quoin strips, chamfered reveals, moulded cills, and advanced bracketed eaves.

On the main elevation facing east, there is a central modern door with a hoodmould above it. A large plaque is positioned above the door, incorporating a marriage plaque from the earlier building. This plaque is inscribed with "RDC 1628 I Mc, God the author of peace let dwell in this place and drop of thy grace to me and thy race to serve the Lord," and below it reads, "The above stone bearing the inscription and date was removed from the wall of the old farmhouse and placed here AD 1858." Above the door, there is a pointed arch window, with a gable breaking over it. To the outer right, there is a bipartite window at ground level with another window above, both beneath a gable. The outer left features a slightly advanced gabled bay with a bipartite window at ground level and a plaque above inscribed "Built by Sir James Colquhoun Esq Lord Lieutenant of Dunbartonshire AD 1858," along with a window in the gablehead above.

The north elevation presents a broad gable with two windows symmetrically placed on the ground floor. The rear elevation (west) shows bays that are symmetrically arranged, with a lean-to porch at the center. The outbuildings attached to the south are constructed of rubble with sandstone margins and dressings, featuring painted margins and quoins, while the windows are blocked with painted timber panels.

The south range, which is attached to the house, is a single-storey L-plan structure with windows that are also blocked with painted timber panels. It has a painted finish and provides an entrance to the rear court, featuring a gable and a link block to the north, with a bipartite window at ground level and a tall lying-pane window above. Additionally, there is a single-storey rubble building running from north to south at the rear.