[2] The spire rises to a height of 242 feet,[3] and this is believed to be the tallest structure in the entire city of Kingston.

Extensive structural renovations were performed between 1987 and 1995, including rebuilding much of the north wall and replacing the 50-year-old asbestos roof (itself a replacement of the original tin roof) with slate tiles.

St Mary's Cathedral did not have any stained glass windows until 1885, when they were commissioned as part of the renovations Archbishop James Vincent Cleary was leading.

The Cathedral has been the location for a number of consecrations for Bishops and Archbishops over the years.

For the 175th anniversary in 2023, St Mary's held a special Lessons and Carols service.