Arniston Mains, Arniston House

Arniston Mains is an early 18th century farmhouse with later additions and alterations. It is a two-storey, three-bay rectangular building constructed from tooled random rubble with droved dressings, featuring long and short tooled quoins with droved margins.

The south elevation is symmetrical and includes a late 20th century gabled porch with a purple grey slate roof that projects from the center of the ground floor. It has a glazed timber door and single pane windows on either side, with concrete sills and lintels. The flanking bays have windows, and there is regular fenestration on the first floor. To the outer right, there is a single-storey, two-bay 19th century addition with a timber door to the right and a window to the left, topped with a piended slate roof.

The east elevation has its ground floor obscured by the two-bay 19th century addition, but shows regular fenestration in each bay, while the first floor is blank. The north elevation is symmetrical with three bays; it has an infilled doorway at the center of the ground floor, single windows in the flanking bays, and a window in the center of the first floor. There is a 19th century addition to the outer left, partially obscured by a 20th century tank, and a lean-to addition to the outer right.

The west elevation was not seen in 1997. The farmhouse predominantly features 12 pane timber sash and case windows. The roof is graded grey slate with a lead ridge and ashlar skews. There are droved coped ashlar gablehead stacks with circular cans, and a harled wallhead stack to the east of the 19th century addition. Cast iron rainwater goods are present.

The gatepiers and boundary walls consist of droved, coped sandstone gatepiers with pyramidal caps and modern ironwork gates. The boundary walls are made of random rubble with rubble coping.