In 1996 a stone coffin dating from the 3rd or 4th century was found during building work, containing the skeleton of a young woman.

The parish church of St. Mary contains a 13th-century west window and font, and an archway and porch from the same period or slightly later.

[5] The village underwent major expansion in the late 20th century, following the development of nearby Caldicot and Magor as suburban housing areas for those working in Newport, Cardiff and Bristol.

It has a clubhouse and dedicated pitches alongside the railway line and is the focal point for many sporting and social activities Undy is the home of the ReadySteadyGo club, an activity club where young children with an autism diagnosis.

[9] The main lines also included a pair of water troughs and their large supply tank.