Firth House, Auchendinny

Firth House is a house dating from around 1770, with later alterations and additions. It is a two-storey-over-basement building, five bays wide, featuring a prominent, painted, pedimented entrance bay. The house is built on a sloping site, falling away towards the northeast. It is constructed of cream-coloured, stugged sandstone with polished ashlar dressings. Features include a base course, cornices above the ground-floor windows, an eaves course, raised moulded window margins to the front elevation, and droved long and short margins to the rear. A garage extension is situated on the south side of the building.

The southwest (principal) elevation has five bays, grouped as 1-1-3. The original three-bay block is on the right, with a slightly recessed single bay to the outer left and a single-bay link, also recessed, between them. The advanced entrance bay, accessed by a staircase, has Doric columns and a dentilled cornice at ground level, supporting a pediment above. A timber panelled door with a rectangular fanlight sits within the entrance bay, and a window with a small heraldic keystone is located above it at first-floor level. There is a window at each floor in each bay, and a small, narrow window to the angle between the link bay and the outer-left bay. A French window and a first-floor window are in the outer-left bay.

The northeast (rear) elevation is two storeys over a basement and has six bays, including a three-bay, three-quarter-circle projection (originally central) and a single-storey, single-bay garage extension to the outer left. The basement has a barred window offset to the left of centre, while the ground floor has a non-aligned window with a flanking narrow window to the left, and a first-floor window above. The projecting bay has three evenly-spaced barred basement windows, a door in the far-left angle, three ground-floor windows, and three first-floor windows. A square doorway with flanking windows is situated in the garage extension, alongside a barred basement window, a ground-floor window, and a first-floor window. Another basement window, ground-floor window, and first-floor window are in the advanced bay to the outer right.

The southeast (side) elevation has French windows with a rectangular fanlight at ground level, beneath a first-floor window and a first-floor window to the outer right.

The house has 12-pane timber sash and case windows, a grey slate piend and platform roof, and flat roofing that serves as a patio to the garage extension. Ashlar coped stacks are present alongside rendered, coped wallhead stacks to the rear, and cast-iron rainwater goods.

Internally, the oval dining room features egg and dart moulding beneath anthemion cornices. Original cornices are retained in the hallway, and there is decorative wrought-iron balustrading to the staircase. Architraved doors with curved door panels lead into the dining room.