Despite what its name might suggest, no medieval structures remain standing amongst the collection of late 18th and 19th-century demesne buildings that currently occupy the grounds. The site’s most prominent historical feature, a datestone inscribed with the year 1732, sits above the entrance to the bawn wall on the eastern side; however, this stone appears to have been relocated from elsewhere and doesn’t actually date the existing demesne wall itself. Archaeological evidence suggests this datestone likely belonged to a post-medieval building that once stood on the same site.

The castle’s moat, which might initially appear to be a remnant of medieval fortifications, actually dates from the late 18th or 19th century and lacks any genuine medieval connections. This later addition forms part of the demesne’s designed landscape, typical of the Georgian and Victorian periods when landowners often incorporated romantic, castle-like features into their estates. The transformation of the site from whatever medieval structure may have existed to its current form reflects broader patterns in Irish estate development, where older fortifications were frequently demolished or absorbed into newer, more fashionable residences.

Historical records, including Cooke’s 1875 documentation, confirm that whilst Franckfort may have medieval origins, the visible remains tell a story of later centuries. The site serves as a reminder that not all Irish castles preserve their medieval character; many evolved continuously through the centuries, with each generation of owners leaving their mark, sometimes completely erasing what came before.