The building is modest in scale, measuring roughly 5.6 metres on its longer axis and 4.9 metres across, but what makes it quietly arresting is its position: tucked into the north-western quadrant of the enclosure, as though sheltering in a corner of a much older structure that was itself already ancient when the house was built.

Ringforts, which are circular or oval enclosures defined by earthen banks and ditches, are among the most common early medieval monument types in Ireland, typically associated with farming settlements from roughly the fifth to the twelfth centuries. They were often reused across the centuries for purposes quite different from those originally intended, and the Simonstown example appears to follow that pattern. The rectangular house within it cannot be dated precisely; the date is recorded simply as indeterminate. A gap of about two metres in the south-eastern bank of the house may mark where an entrance once stood, offering a small but telling detail about how the space was organised and used. The site commands extensive views in all directions from its hilltop position, which may have made it attractive for reuse long after the ringfort itself fell out of regular occupation.