Ewloe Castle combines features from both motte-and-bailey and enclosure castles. An asymmetrical curtain wall – with parapets – encloses two courtyards. A rock-cut neck ditch defends the southern side of the castle. In the upper triangular inner ward is a D-shaped tower known as the "Welsh keep". This stands on a stone outcrop that forms the motte; it has a stone revetment around its base (a basic Chemise). The lower outer ward is enclosed by two separate sections of wall that meet at a circular fortified tower, which stands upon a rocky knoll. As the curtain walls are not joined together, ladders would have had to be used to reach their parapets.
