The surviving structure, measuring 19.1 metres by 6.35 metres internally, is built from rubble masonry with distinctive ashlar quoins at the corners. The eastern gable features an elegant two-light lancet window with its original punched stone dressing, characteristic of 16th-century craftsmanship. Though time and nature have taken their toll; a tree growing through the southern wall has dislodged one window, and the western gable stands at just 2.1 metres high; the church retains enough architectural detail to reveal its former significance.

North of the abbey, the grass-covered foundations of what local tradition identifies as the Abbot’s House stretch 12.2 metres in length. Small cairns of stones within this rectangular structure were created by pilgrims performing religious stations, adding layers of devotional history to the site. To the east stands a small barrel-vaulted structure built between 1840 and 1850 by Rev. John Campbell, the resident curate of Glenswilly. This modest building, constructed over the grave of Bishop Coyle, Catholic Bishop of Raphoe from 1782 to 1801, houses an altar against its western wall and incorporates a moulded window-jamb fragment in its southeastern corner.

The graveyard itself holds unexpected treasures for those interested in medieval stonework. The gateposts contain several punch-dressed blocks and window fragments, likely salvaged from the church during repairs or collapse. Two particularly intriguing pieces feature carved animals in relief: one shows a fish biting the tapering point of an out-turned stop with a crude unicorn above it, whilst another displays what appears to be a stag. These sculptural details, probably from the ruined window in the church’s south wall, offer rare examples of decorative medieval stonework. The graveyard wall, also constructed by Rev. Campbell in the mid-19th century, bonds directly into the northwestern and southwestern corners of the church, creating a unified sacred space that has served the local community for centuries.