The earlier date is 1672, accompanied by initials that record the house's first builders; the later date, 1748, bears the inscription "Rebuilt by Wm Izod Esq". Between those two moments lies the particular strangeness of the place: a house that was already old enough to need rebuilding, with a name, Chapelizod, that ties it firmly to one family across generations.

The Izod connection appears to reach back to the original construction, with one reading of the memorial stone's initials suggesting a Kevan woman who married into the family, a certain Lionel Izod, may have been among the founders. By the time William Izod undertook his reconstruction in 1748, the house sat at the centre of a substantial demesne. The first edition Ordnance Survey six-inch map of 1839 shows it commanding the whole of Grovebeg townland, with the estate extending into parts of the neighbouring townlands of Haggard and Raheen to the north and west. A nineteenth-century photograph gives a clearer sense of what that rebuilt house eventually looked like: a five-bay central block with a projecting ground-floor porch, a half-dormer attic, a hipped roof with chimneys at either end, and a rear return. Attached to the south was a ground-floor structure with a steeply pitched roof, possibly a ballroom; to the north, a two-storey three-bay range with a gabled end bay projecting forward.

What stands now is considerably less. The main block, which included a basement, has been reduced to ruins after a prolonged period of unoccupancy, and a good deal of its stonework has been taken away and reused elsewhere over the years. The overall form and proportions of the building remain readable, and some of the original fabric survives in place, enough to trace the outline of what was once a well-composed, if modest, rural house with a longer and more layered history than its appearance might suggest.