Built of Prince Edward Island sandstone in the High Victorian Gothic style of architecture, it overlooks Rochford Square.

All Souls' Chapel was built in 1888 as a memorial to Father George Hodgson, the first "priest-incumbent" of St. Peter's Cathedral, to a design by the noted ecclesiastical architect William Critchlow Harris.

The arched reredos is typical of William Harris's style, containing statues of Christ and his apostles.

The round painting above the reredos is of Christ ascending to Heaven, and has been a treasured icon to generations of cathedral parishioners.

The chapel was built by Lowe Brothers of Charlottetown and the woodwork was carved by Messrs Whitlock and Doull.