The footprint is modest, roughly ten metres along its longer axis and just over four metres across, pressed up against the inner face of the cashel wall as though seeking the shelter of it. A cashel is a type of early medieval stone ringfort, its circular or oval perimeter wall defining a protected domestic space, and this small house appears to have made use of that boundary rather than standing independently within it.

What makes the situation at Rannagh quietly interesting is that this was not a solitary arrangement. About fourteen metres to the east, a second and larger house foundation also abuts the same cashel perimeter, following the same logic of building inward against an existing wall. Two structures, different in size, arranged along the inner face of the same enclosure, suggest a pattern of habitation rather than a single isolated dwelling. The date of either house remains uncertain, which is not unusual for foundations of this kind; without excavation, the relationship between the cashel itself and the buildings tucked inside it can only be inferred from their shared stonework and spatial logic.