Barn and Horse Engine House Approximately 5 Metres East of Wellesley Farmhouse

The barn and horse-engine house, located approximately 5 metres east of Wellesley Farmhouse, is a structure that dates back to possibly the 16th century, with the horse-engine house added in the 19th century. It is constructed from small shale stones and features a slate roof with gable ends for the barn and a polygonal slate roof for the horse-engine house. The barn has a rectangular plan with a right-angled gabled porch that projects from the right of the centre on the south side, while the horse-engine house is adjacent and parallel to it.

On the north side of the barn, there are large double doors for cart access at the lower end, which have an original surround with jowled heads on the jambs. Flanking buttresses with offsets support the structure, and there is a ventilation slit at the left end. The centre features a small two-light window with a timber surround, and at the upper end, there is a single door with a timber lintel, flanked by buttresses. The south side has two sets of opposing double doors, with the lower end featuring a weather-boarded gable end to the projecting porch. Ventilation slits are present at each gable end.

The barn's roof structure is largely intact, showcasing six impressive raised cruck trusses with apex strengthening pieces, arch-braced collars tenoned into mortices on the blade soffits, two tiers of purlins, and a diagonally set ridge purlin. The second truss from the east end is closed with a partition made of partly stone and partly plank. The porch roof is supported by a smaller raised cruck truss with a similar collar but without arch bracing. Additionally, a massive horizontal winding beam remains in the horse-engine house. This barn is noted for being an unusually complete example of an early barn.