Trefnant School

Trefnant School is an L-shaped school building designed in a restrained Tudor-Gothic style, with an adjoining master's house at the rear. It is constructed from uncoursed, roughly-dressed limestone blocks, featuring tooled ashlar dressings and slate roofs that have overlapping copings on the gable parapets. The roof sections include three metal louvre bases, although the louvres are now missing. A tall chimney with splayed sides, a chamfered top, and a cornice band adds to the structure's character.

The entrance front consists of three bays, with the left bay being advanced and gabled, featuring a catslide roof extension that continues to the right over a flush, central porch. The gable contains a pair of tall lancet windows with an oculus above, all framed within a large, flush ashlar arch. The original iron intersecting lozenge glazing remains in the oculus, while the other windows have plain modern glazing. The pointed-arched entrance is stepped up and features a modern panelled door with a plain triangular overlight above it. The right-hand bay has a large square window with tripartite modern glazing, and there is a blocked lancet group window to the right gable. Modern extensions are located to the northeast of this bay. The long left side of the building has three additional large square windows.

The interiors have been modernized, with contemporary partitioning and false ceilings that obscure the original open roofs in the main and lesser classroom halls.