The castle played a significant role in the local landscape, and its construction was attributed to the knight William de Barry.

The castle's evolution continued under the ownership of John de Barry, who oversaw repairs and extensions, including the construction of a southern great hall and a distinctive gatehouse.

[1] During the 14th century, the castle underwent further expansion, incorporating a southern great hall connected to a gatehouse and a corner tower.

[1] The gatehouse, a prominent feature of Barry Castle, included a pointed portal with a portcullis, double doors, and a drawbridge.

The gatehouse's upper floor was linked to the adjacent hall building and featured a curving passage connecting to the defensive wall-walk.