The single-storey structure was built of clay and stone, with a hipped roof of unsawn timbers, pegged rather than nailed, and covered in wheaten thatch that had at some point been overlaid with corrugated iron. Inside, a large open hearth dominated the space, its brick canopy resting on a stout unsawn bressamer, the heavy horizontal timber beam used to carry the masonry above a fireplace. Beside the hearth sat a brick-lined, domed wall oven. The lobby-entry plan, where the front door opens directly onto a small lobby positioned between the hearth and the entrance, is a layout associated with vernacular Irish and English domestic building from the sixteenth and seventeenth centuries. The whole ensemble suggested a structure that had been continuously patched and adapted rather than ever substantially rebuilt.

The farmhouse may carry a more specific history than its modest appearance implied. Researchers have linked it tentatively to the dwelling of one George Taffe, at whose house mass was reportedly said in 1630, during the period of Catholic suppression under the Penal Laws, when private homes regularly served as places of worship. The same farmhouse appears to be the one described in the Civil Survey of 1654 to 1656, a detailed Cromwellian-era record of landholding across Ireland that documented properties in considerable, if sometimes dry, detail. Both references are noted by scholars Ronan and Simington respectively, and the building was recorded as part of the Vernacular Building Survey of County Dublin.

By the time surveyors returned to the site in 2010, the building was gone. The new owner confirmed that a house had existed there but had been demolished sometime in the previous two decades. None of the remaining farm structures matched the description recorded in 1994. What had survived, quietly, for somewhere between three and four hundred years did not survive the end of the twentieth century. The site at Grange now holds no trace of the structure, making the 1994 survey record the closest thing to a last testimony for a building that may once have served as an illicit chapel, a working farmhouse, and an accidental link to some of the more fraught decades of early modern Irish history.