Balfour Mains Farmhouse incorporating Balfour Castle, Balfour Mains, Kingoldrum

A circa 1840 farmhouse with late 19th century additions to the rear and incorporating a fragment of an early 16th century castle to the south corner. The farmhouse is 3-storey with the upper floor breaking the eaves, 3-bay, symmetrical principal (southwest) elevation with a 2-storey wing to the rear to form an L-plan. There are single storey additions at the re-entrant angle. It is built with tooled red sandstone rubble and roughly squared quoins and has ashlar window margins. There are gablet dormerheads with a finial at the apex. There is a circa 1999, single storey, piended roof porch at the centre of the southwest elevation.

The windows are predominantly 12-pane glazing in timber sash and case timber frames. The farmhouse has a pitched roof with grey slates and chimney stacks at the gables, with that to the south gable heightened in brick and that to the north gable replaced in brick. There are coped, sandstone ridge chimney stacks to the rear addition.

The interior was partially seen in 2013 and consists of rooms flanking a central dog-leg staircase with a decorative cast iron balustrade. There are some window shutters and some panelled timber doors.

The fragment of Balfour Castle is an approximately 17m tall, tapering round tower with a later monopitch slate roof. It is rubble with dressed stone to a variety of openings including arrow slits and there are string courses stepped over the openings. There are oval gunloops at the base and a later entrance to a vaulted basement. There is a fragment of a return wall to the northeast side.