Lodge, Finnart House, Arrochar Road, Finnart

The lodge at Finnart House, designed by William Burn around the 1830s, is a picturesque single-storey building with a raised basement on the northwest side due to the sloping ground. The main block has a circular plan with gabled and piend-roofed projections that create a bi-axial V arrangement on the main elevation. The exterior is constructed of rubble with stugged red sandstone margins and dressings, featuring quoin strips, projecting eaves, and exposed rafters.

On the south (main) elevation, there is a gabled porch with a depressed-arch doorway and a window on the left return. To the right of the porch is a parapet of the avenue bridge over the burn, with an octagonal die abutting the left side of the porch. The entrance features a flush six-panelled door. The central area has a higher bowed bay with a blocked window directly under the eaves, and there is a blank bay to the outer left.

The north (rear) elevation features an advanced, shouldered, and pedestalled stack at the center, with curved walls on either side that include a window. To the right, there is a swept cat-slide roof over the curved bay. All windows are currently blocked, although they were formerly bipartite casements. The roof is covered with grey slate and topped with a lead finial, while the wallhead stack is coped and has circular cans.

The boundary wall is made of rubble with semicircular coping.