Local tradition calls it the 'Rest House', and the name carries its own quiet logic: by 1838, when the Ordnance Survey Letters recorded it, the structure was already described as a shelter for "the lame and the blind" who came to the well on Patron Day. Samuel Lewis, writing a year earlier in 1837, called it a chapel, noting that it drew large crowds at two annual patrons, on the 15th of August and the 8th of September. Whether it was ever a formal place of worship, a simple refuge for pilgrims, or something that served as both at different times, is not clear. Its origin is uncertain; it may date to the 17th century.

The building is rectangular in plan, measuring roughly 5.3 metres by 3.6 metres internally, and constructed from mortared limestone and sandstone blocks, with the largest stones laid at the base and corners. Two lintelled doorways pierce the gables; above the one in the south-east gable there is a window with a pointed arch, a detail that nudges it towards ecclesiastical or at least semi-formal use. The doorway in the north-west gable opens directly towards the holy well, which sits immediately to the west, and that alignment feels deliberate. By the early 2000s the south-east gable still stood close to its full height of around 3.7 metres, while the opposing gable and the two side walls had deteriorated considerably. Conservation works carried out in 2016 have since stabilised what remains. Inside, an inscribed stone survives, though what it records has not been specified in surviving accounts of the site.