The cathedral grounds include a graveyard, a vicarage and a parish hall completed in 1995.

In addition to being the seat of the Diocese of Espoo, it serves as the church for the Espoo Cathedral Parish and hosts various concerts and other events including the "Organ Night and Aria" concert series.

[1] The church was originally designed in the late 15th century by an unknown "Espoo master" and built between 1485 and 1490 under his supervision.

[2] The vaults and walls of the older parts of the cathedral are decorated with murals, largely painted in the 1510s, that depict both biblical scenes and events in the daily life of the people.

The paintings were covered in the 18th century as they were thought to be "crude and superstitious" but uncovered again and conserved during renovations in 1931.