In 1967, the south wall was extended to the front façade of the tower adding a fifth bay to the original structure.

Until 1908, it was the only Catholic church serving Peterborough and the surrounding communities of Smith, Douro, Otonobee and North Monaghan.

[2] The current building was designed in a cruciform, modified English Gothic Revival style, then popular in Upper Canada, by James Chevette.

[2] On the back wall of the chancel, there is a 42-foot high and 25-foot wide mosaic of the Last Supper by Alexander von Svoboda installed in 1968.

[4][5] Media related to Cathedral of St. Peter in Chains (Peterborough, Ontario) at Wikimedia Commons