Drystone construction means exactly what it sounds like: no mortar, just stone laid against stone with enough precision to hold together through Atlantic winters. What makes this particular structure quietly remarkable is not its age but its specificity. It was built not as a dwelling or a field shelter but to house the tools and materials used in drying kelp, and it comes with an associated enclosure for storing the seaweed itself, dated to the 1930s.

Kelp harvesting was once a significant part of life along Ireland's western seaboard. Seaweed was gathered, dried, and burned to produce an ash rich in alkalis and iodine, used in the manufacture of glass, soap, and later in the pharmaceutical industry. The industry declined through the nineteenth century as cheaper chemical alternatives emerged, though communities on the Aran Islands continued working with seaweed into the twentieth century. The hut at Ceathrú An Teampaill, recorded by Tim Robinson in 1980, represents that later period of the trade, a functional outbuilding fitted with a lintelled roof, meaning flat stone slabs laid horizontally across the walls to form a ceiling, rather than a corbelled or thatched covering. The associated enclosure beside it was designed for the seaweed itself, keeping it contained and manageable during the drying process before further use.