The well shaft itself is circular and tight, less than a metre across, and is lined with a corbelled stone wall, a technique where stones are laid so that each course slightly overhangs the one below, creating a domed or tapered effect without mortar. That wall rises just above ground level and is wrapped on the outside by a low, sod-covered stone mound. A rectangular opening, closed by a lintel and a pair of capstones set slightly apart, faces south-south-west, and a third capstone sits on top of everything, sealing the well head. Traces of mortar, possibly cement, are visible inside and on the exterior right-hand side of the opening, suggesting the structure was maintained or repaired at some point, though by whom and when is not recorded.

What lifts Brickendown Well beyond a curiosity of rural stonework is its status as a holy well, a category of site with deep roots in Irish devotional practice, often associated with healing, patron saints, or local protective traditions. The custom of tying cloth offerings, sometimes called clooties or rags, to a tree beside a holy well is one of the oldest and most widespread of these practices, and it survives here. A mature whitethorn, or hawthorn, stands roughly four and a half metres to the north-north-east of the well, and local knowledge holds that white rags are still hung from its branches by those who visit. The whitethorn carries particular significance in Irish folk tradition, long regarded as a threshold tree associated with the otherworld and with protection, which makes its pairing with a holy well entirely characteristic. The well bottom is silted and carries some pondweed and nettles, and the water depth recorded was only around twenty centimetres, suggesting a modest but persistent source rather than a deep spring.