The Summerhouse about 10 metres South West of Compton Castle

The Summerhouse, located about 10 meters southwest of Compton Castle, is a 19th-century structure built from roughly cut and squared Ham stone, featuring ashlar dressings and leaded light windows. The building has an elliptical shape, consisting of a rectangular block aligned north to south, with semi-circular bays at both ends and a central projecting bay on the eastern entrance front.

This two-storey building has three bays in the central rectangular block and additional curved bays to the north and south. The eastern elevation showcases a central projecting bay with a doorway featuring three moulded pointed arches, where the two central arches are reduced to pendentives adorned with foliate bosses. There are further arches at the north and south ends of the bay, and the wide double doors are intricately carved with linenfold panels. Above the entrance, there is a large rectangular window with ten lights, each topped with Tudor arches and divided by mullions and a transom. Flanking the entrance are round-headed niche windows with keystones, along with a single-light Tudor-arched window above. The side bays contain irregularly placed single-light windows with hoodmoulds. A coved cornice tops the structure, leading to a plain parapet, while the rear elevation is unadorned.

Inside, the ground floor features unrendered walls and a flagged floor. To the north, there is a niche between two doors, with the left-hand door providing access to a curved stair. The upper floor walls are rendered, and a plain stone fire-surround with a chamfered lintel is located at the south end. The original interior doors, unpainted and featuring flat Tudor arches, are set within moulded frames.

The Summerhouse is connected to the 1820s Apple Room, which is also listed, by a cranked stone wall with stone coping.