Flight of steps to E of tunnel under canal

The structure is a tunnel under the canal, which includes a flight of steps to the east. The tunnel runs from northeast to southwest and measures 33.6 meters in total length. The original section is located under the canal at the downhill end, featuring a high stone revetment wall that follows the canal's curve, along with a round arched entrance made of red sandstone voussoirs set back from the arch. This section is stone-lined and has a semi-circular arched roof. The second phase of the tunnel is similar and maintains the same alignment, while the third phase, located directly under the house, shifts to an east-west alignment with straight sides and a flat roof that also serves as the floor of the house. There is a culvert on the southeast side. At the uphill end, the tunnel entrance is positioned beneath the gable end of the house and is covered by a cast-iron plate. On the downhill side, a steep flight of stone steps connects the towpath to the tunnel, with one step inscribed 'B & A C Co' for the Brecon and Abergavenny Canal Company.