Mauchline, Mauchline Castle (Abbot Hunter's Tower)

Mauchline Castle is a late-medieval tower house built in the mid-15th century as the focal point of a Cistercian grange (monastic farm) belonging to Melrose Abbey. The rectangular structure measures 10 metres by 9 metres with walls 5 feet thick, constructed of squared ashlar red sandstone with carved detailing. It comprises two principal floors above a vaulted basement, with an attic storey. The tower is crowned by a steeply-pitched slate roof with crowstepped gables, ashlar chimneystacks and a corbelled parapet.

To the south, an L-plan house of late-17th century origins known as Gavin Hamilton's House adjoins the tower, the two buildings having been internally linked by a pend built around 1800. The tower house has remained vacant since at least the late 19th century.

The main entrance on the south elevation comprises a square-headed door opening with dressed surrounds. A secondary entrance on the first floor, reached via a 17th-century stone forestair, has a recess above for a statuette. Two garderobe outlets with covered chutes on the north elevation discharge into the Mauchline Burn. Small, plainly detailed square-headed openings serve the upper levels. The east and north elevations contain relatively large non-defensive window openings, some arched, many blocked with late-20th century brickwork. A particularly fine twin-light opening is ornately detailed with cusped heads, an elaborate architrave and a carved figurative boss.

Partial repairs were carried out between 1976 and 1978, when the east and west walls were strengthened with iron girder ties. Evidence of the building's former larger complex survives as raggles (grooves in the stonework) on the west and south elevations marking the rooflines of previously adjoining structures. A retaining wall running west along the burn may also represent the remains of earlier ancillary buildings. Gavin Hamilton's House is understood to contain a vaulted ground floor room contemporary with the tower house.

The interior has not been directly surveyed since 2017, so the following account is based on written records from 1931 to 2002. The basement contains two vaulted cellars accessed via an external stair to the west. A turnpike stair in the southwest corner formerly connected all floors, though its opening to the first floor has been blocked and the stair has partially collapsed. The large ground floor room once had a timber ceiling supported on large corbels, which was gone by 1991. The first floor is accessed via the external forestair and contains a two-bay hall measuring 7.6 metres by 6 metres with quadripartite ribbed vaulting carried on carved corbels. Three decorative bosses originally adorned the ceiling, though one had fallen by 1991. A stone window seat survives on the north side, and garderobe and intermural chambers remain on the principal floors. However, fireplaces and window surrounds have largely been altered, and doorways to former ancillary buildings on the south and west elevations have been blocked.