Ruins of Catchfrench Old House and screen wall, attached to south of Catchfrench Manor

The ruins of Catchfrench Old House, along with an attached screen wall, stand to the south of Catchfrench Manor. Dating primarily to the 16th century, with some features from the 18th century, the building is constructed of slatestone rubble, partly slate-hung, and has granite dressings. The roof no longer exists. The ruins form a two-room plan, likely representing a remnant of a larger house that originally included a central porch tower leading to a through passage, a hall to the right, and a lower end room to the left.

The three-story porch tower is slate-hung on its left side and features a ground-floor doorway with a four-centred arch, granite surround with cavetto and roll mouldings, pyramid stops, and recessed spandrels decorated with leaves and a hood mould. The first floor has a three-light granite window with hollow-chamfered mullions and a hood mould, with a similar window on the second floor. A scrolled kneeler is positioned to the right, and a blocked doorway is on the left side. Inside the tower, a stone floor remains, along with sockets for former first-floor beams. A fireplace with a flat, chamfered granite lintel and jambs is located on the first floor’s rear side. An inner granite doorway has a four-centred arch, roll and hollow mouldings, pyramid stops, and roundels in the spandrels. Plaster remains on some of the walls. The hall to the right retains a large six-light window with a king mullion and transom, with hollow-chamfered mullions; one light is blocked. A partial moulded granite eaves cornice is also visible. The lower end room to the left features a four-light window with a king mullion, hollow-chamfered and with a hood mould, and a similar window above. The wall curves back to the left, with the screen wall extending forward approximately 8 meters in three distinct phases with straight joints. A doorway with a flat brick head is centrally located. A tall, four-centred arched doorway adjoins Catchfrench Manor, also hollow-moulded, featuring leaves in recessed spandrels and the inscription "1580 GEORGE KEKEWYCHE" above its head. A 20th-century wrought iron gate spans the doorway. A doorway with a timber lintel and the remains of an external stack are located on the building’s right side. The building may have originally been U-shaped, with wings to the front right and left enclosing a courtyard, and extensive rebuilding has been undertaken.

Internally, a rear passage doorway has a four-centred arch with plain convex moulding on its outer side, with a wall of slatestone rubble blocking the doorway. There is no visible evidence of a hall fireplace, and the hall was likely never floored. The lower end room has a lower floor level than the passage and hall. A wall rises to full height in the lower end, revealing a granite four-centred arched doorway with roll and hollow mouldings and recessed spandrels decorated with leaves. It is thought that the hall was once separated from the passage by a screen; only footings remain on the hall side of the passage.