Far less attention falls on a small, partially buried wall protruding from a slope in the area known as the Lower Monks' Garden, on the north-eastern side of one of the site's terraces. This modest fragment of drystone construction, designated F1022 during excavation and conservation work, is easy to overlook; it measures roughly 2.5 metres east to west, rises to about a metre in height, and carries a slightly splayed jamb, the vertical side-stone of what was once a doorway or opening, projecting just 0.2 metres from its south face. When first properly examined, it was still partly hidden beneath a growth of red campion.

What makes this wall fragment genuinely interesting is what it reveals about the sequence of building on the island. According to work published by Bourke, Hayden and Lynch in 2011, the wall sits at a higher level than the surviving stone walk-way of the monastery's original outer enclosing wall, which means it was constructed after that earlier boundary had already fallen out of use. Equally telling, the same wall lies beneath the paving that surrounds Cell G, one of the clocháns, the dry-stone corbelled huts characteristic of early Irish monasticism, that stands roughly three metres to the north. This stratigraphic sandwiching, later than one feature and earlier than another, demonstrates at least two distinct phases of early medieval construction activity on this part of the terrace, both of them post-dating the original enclosure. The structure has been tentatively associated with a guesthouse in the published plans of the site, though the short surviving length of wall makes a firm interpretation difficult. On a site so often treated as a single, unified achievement of early Christian asceticism, this small wall is a quiet reminder that Sceilg Mhichíl was rebuilt, adapted, and reorganised across centuries of monastic life.