Walled Garden, Penninghame House

The Walled Garden at Penninghame House, attributed to Brown and Wardrop and dated 1869 over the door, is a large asymmetrical Gothic house. It features two storeys and an attic, with a three-stage square tower located at the southwest corner. The exterior is constructed of coursed squared and packed whinstone rubble, accented with polished cream sandstone dressings and quoins. All windows are mullioned and transomed, fitted with sash and case designs and two-pane plate glass glazing. The attic windows are set in gablets.

On the west elevation, there are three bays with the tower positioned to the right. The main door is at the base of the tower, featuring a roll-moulded design with a heraldic panel above and a stepped string course. The centre has a recessed bay, with a square projecting three-light window to the ground on the left.

The south elevation has four bays with the tower on the left. To the right, there are projecting canted bays at ground level with embattled parapets flanking a blind central bay; the first floor has tripartite windows, with a single window on either side. The attic features tripartite windows set in gablets.

The north and east elevations are similarly detailed, with the north elevation containing the service quarters where parts of an earlier 19th-century house can still be seen. The building has tall Neo-Tudor stacks grouped together and is topped with slate roofs.

Inside, the well-preserved interior includes a hall with a scale and platt open stair, barley-sugar twist balusters, an arched screened first-floor landing, and a cupola. Most of the chimneypieces are original, along with doors and panelling. There is a sliding concertina screen leading to the dining room and good simple plasterwork throughout. The stables, contemporary with the house and located to the north, form a U-plan two-storey stable block. They feature oculi under the eaves of the central range facing the courtyard, a decorative weathervane above, and a lean-to at the rear. A stone forestair leads to the exterior elevation of the west range, and flat lintels are present above the carriage openings to the courtyard elevations.

The walled garden is a rectangular space located to the west of the house, featuring a two-storey corner pavilion with a piend roof and a single-storey gabled wing, along with lean-to service buildings on the outer elevation.