Lakeside House, Gordon Castle

Lakeside House, located at Gordon Castle, is a two-storey garden pavilion or tea house, possibly designed by architect John Paterson from Edinburgh between 1800 and 1801. The building is constructed to adjoin a walled garden, with the garden wall forming a continuous structure with the south elevation of the house. The ground floor previously featured a glazed vinery or conservatory, which opened into the house.

There is a substantial later two-storey rear addition, and single-storey lean-to wings have been added on either side of the house. The first floor is hung with slate from Banffshire, although the south front has been replaced with painted material that resembles tile-hanging. The building has undergone harled and rendered alterations.

The current entrance is located in the re-entrant angle at the rear. A bowed French window serves as the central entrance to the three-bay south garden front, flanked by windows, one of which is half-blocked. The first floor is illuminated by a wide centre bowed window with blind outer lights, aprons, fluted jambs, and a frieze featuring lozenge ornament. Venetian window lights are present on the west elevation of the first floor, while two round-headed windows light the east side. The glazing is multi-pane, and a mutule cornice encircles the building, which has a rear centre wallhead stack and a flat roof.

Inside, the original house features a floor plan consisting of a single circular chamber within a cube on both floors, with the upper floor accessible by a curved cantilevered staircase at the east, adorned with slender balusters and carved decoration on the outer face. Small rectangular rooms open off the main circular chambers on both the ground and first floors. The circular rooms are equipped with beaded panelled window shutters, panelled dados and doors, and carved wooden chimneypieces flanked by fluted engaged columns. Decorative ceiling cornices add to the interior's elegance, while the curved wall of a small first-floor room at the west is embellished with carved trellis-like ornamentation.