According to a plaque recently erected on the site, the chapel at Whitestown was built by Breton mariners saved from a storm, and dedicated to Saint Maur. It is an arresting claim for a ruin that most people would pass without a second glance, tucked on a low rise above Rogerstown estuary on the north Dublin coast.

The Civil Survey of 1654 to 1656 records the building as a chapel of ease at a place then spelled 'Whytestown', as noted by R.C. Simington in 1945. A chapel of ease was a subsidiary place of worship, built for the convenience of parishioners who lived too far from the main parish church to attend regularly. What survives today is part of the east gable, which contains a wide pointed arched window. Beneath it, a distinct raised mound marks the footprint of the nave, measuring roughly 17 metres east to west and 8.5 metres north to south. A graveplot is attached to the western facade. The wall has been stabilised at some point, and a modern cross sits at the apex of the gable, though vegetation has taken hold along the top of the masonry, and mortar washout and some cracking are visible at the base.

The site sits within an active graveyard overlooking Rogerstown estuary, which gives the approach a quietly layered quality; the estuary view and the graveyard context do much of the atmospheric work before you even reach the ruin itself. The surviving gable is the focal point, and the pointed arch of the window is the detail worth examining closely. The raised nave mound is easy to miss if you are not looking for it, but it gives a clearer sense of the building's original scale than the standing masonry alone. There is no formal visitor infrastructure here, and the site rewards a slow, attentive walk rather than a quick glance from the gate.