The walled garden at Charlton Park (incl walls, potting sheds, former bothy, the Garden Cottage, the Garden Flat and glasshouses)

The walled garden at Charlton Park is a kitchen garden dating from the early 1770s, attributed to Lancelot 'Capability' Brown and built for the Earl of Suffolk and Berkshire. In the early 20th century, it was altered by Lady Suffolk to become the principal flower garden, with its former conservatory or orangery converted into a pair of matching gardener's cottages.

The garden is constructed in stone rubble and Flemish bond brickwork with stone ashlar dressings. The cottages are built in stone rubble at the north front and brick to the rear, with stone ashlar dressings, pitched slate-covered roofs and stone stacks.

The walled garden is situated in the western part of Charlton Park, approximately 950 metres west of Charlton House. Oriented north-south, its walls enclose an irregular hexagonal area of approximately 1.8 hectares, divided in half by an internal wall running east-west. At its north end stands the pair of gardener's cottages linked by a semi-circular colonnade facing the garden.

The garden walls are approximately 3 metres in height. The sections to the north are built in stone rubble and lined in brick internally with flat stone copings, whilst the remaining sections, including the inner wall, are built in brick with flat stone copings. The garden can be entered via entrances from all sides, with both round and segmental arches. Some retain original pintles for wrought iron gates, though many gates are later replacements. The central wall dividing the garden in half, and the south wall, have large central openings with curved ramps inserted in the early 20th century to create a central vista as part of Lady Suffolk's flower garden scheme.

The two-storey north front of the cottages, built in stone rubble, projects forward from the garden wall and is six bays wide: two projecting outer bays with four bays to the centre. Four-pane timber casement windows are set in segmental arched openings, with entrances to bays two and five (some later replacements). The outer bays to the south front, facing the garden, have canted bays at ground floor level with Diocletion windows set above the string course, topped by a tall moulded parapet with three ball finials. The adjoining centre bays have 12-pane sashes set behind a tall convex exedra built in brick with four free-standing stone columns to each side and coupled columns to the centre, all with Ionic-style capitals.

The interiors of the cottages, refurbished in the 1980s and now known as Garden Flat and Garden Cottage, could not be inspected.

Attached to the outside of the west and north-west garden walls are two rows of brick lean-to potting sheds with later repairs. Approximately 15 metres north of the walled garden, opposite the cottages, stands a small outbuilding, possibly a former garden bothy, built in stone rubble similar to that of the garden wall, with pitched roofs.

Inside the walled garden, sections of stone-paved paths survive, including two circular ponds with stone surrounds, now disused.