The church interior and exterior architecture is built in the late baroque style with classic features.

The cathedral interior is characterized by its Rococo features and luxurious furnishings with wood carvings and gold plating.

[2] It was the first large mechanical pipe organ in Latvia and was built by Henrich Andreas Contius in 1779.

[3][4] In 1865–1866, the building underwent its first major reconstruction – the original draft tower was raised on the two upper floors to almost 55 metres high.

The cathedral houses the cathedra (seat) of the Bishop of Liepāja, who leads one of the three dioceses of the Evangelical Lutheran Church of Latvia.