Hydro-accumulator tower at Briton Ferry Docks

The hydro-accumulator tower at Briton Ferry Docks is a roofless structure that remains as a shell, with its exterior walls largely covered in vegetation. It is a tall, three-stage tower with a square plan, built from snecked rock-faced stone. The tower features a projecting plinth and an eaves cornice that extends on a corbel table.

On the west side, which faces the docks, there is a round-headed window in the middle stage, with part of its iron-frame glazing still in place. The east side has a similar middle-stage window, complete with key and impost blocks, as well as a round-headed doorway in the lower storey that shares similar architectural details. The north and south sides both contain narrow openings at plinth level, with the south side's openings blocked.

Inside, there are two closely spaced timber beams located just below the top of the wall. Additionally, the north and south walls have infilled sockets for three other similar pairs of beams. Although the tower is roofless, a triangular boarded panel from a former shallow hipped roof rests on top of the structure.