Just beyond the gatetowers in the inner ward are the remains of baking ovens and two cisterns, which would have caught rain water and augmented the castle's drinking supply. Curious structures, the cisterns consist of stone-lined pits with low containing walls. The castle's primary water container was the clay-lined ditch just outside the gatehouse. The wisdom of locating the water supply outside the main castle is questionable, since the water source would have been effectively cutoff in an attack. While the cisterns probably provided adequate short term drinking water, the shallow holding tanks would have been of little use during a protracted siege.
Carreg Cennen Castle's simple layout provided all the amenities any castle dweller needed. The most built-up side of the fortress is the eastern wing, to the left upon entry, which contained the main domestic chambers. They form a rather compact yet logically laid- out complex of buildings, and would have been the site of most of the castle's activity. The wing begins with the North East Tower, immediately east of the gatehouse. Possibly used as living quarters for the garrison, the tower contained some basic luxuries of life - a fireplace and latrines - and was located in an excellent strategic position to guard the outer ward, the barbican and the inner ward. Next to the tower was the castle's kitchen, with its huge fireplace, buttery and pantry. Alongside this structure was the hall, where meals were served and guests entertained. Notably, this room was heated with a central hearth (its base still remains). Beyond the hall is a small tower which projects into the outer ward and held the chapel, a key component of most medieval castles. Lastly, the two rooms of the lord's private apartments are at the farthest end of the eastern wing. Here a fireplace and decorative windows hint at the status of the occupant.
Little remains along the south and west walls of the inner ward. The plain south curtain, with portions of the wall-walk still intact, rises to its original height. The precipitous drop outside made more elaborate defenses unnecessary. The wall held latrines and two windows with stunning views. Foundations of a rectangular structure are visible along the south wall, but the building's purpose is unclear. The intersecting arrowslitted west wall was built directly on the limestone bedrock and is poorly preserved. It is bounded by the simply-constructed South West Tower and the interesting North West Tower.
The North West Tower guarded the most vulnerable side of the fortress, and its round design would have afforded an all- encompassing view of approaching visitors. The basement had three arrowslits, one of which was altered in the 15th century to accommodate a new advance in weaponry: the musket. Why this tower was the only one with a gunport is uncertain, but the gun's longer range would have greatly enhanced its defensive impact.