The castle consisted of a keep with an inner ward and an outer ward that had a garden. At least two corner turrets at opposite angles strengthened the bawn of the outer ward that included a number of buildings. Access was through a gatehouse from the medieval road.

The castle was typical Irish architecture made of limestone with a mortar of lime, cattle hair and blood. The stone vaults were made with wickerwork supports of baskets forming the vault on which the stones were set in place with mortar. In many places the wickerwork, more then 500 years old, remain in place. The roof was covered with slates. Slate and cobble were on the ground floor. The walls were six foot thick supporting the 60-foot high building.

The ground floor was storage. The floor over it was the guards' quarters. The third floor was the kitchen that retains its massive six by three foot fireplace. The next floor was a suite of two rooms, the larger having a fireplace. The upper floor was the largest room, lighted by large windows. It also had a fireplace. This room was the living quarter of the master who had banquets there. The medieval toilets were at two different levels and retain the French name garde robe. Here clothes were stored preserved thanks to ammonia.

Defense was carried out from the battlements at the top, from the galleries at mid height and from numerous loopholes. On the ground floor all doors interlock themselves. The main door was strengthened on the outside by a yet and on the inside by a portcullis. If an attacker got into the lobby he was attacked from a murder hole in the ceiling and confronted by fire from a loophole facing inside. He would then have to climb the spiral staircase, which is clockwise giving an advantage to the defender manning the sword with his right hand. Communication between the floors was insured through chimney flues, which connect each other for that purpose.
 

A rose, a bird (heraldic martlet), a very Irish marigold and two kinds of triskele surround her.