 Originally a spire was intended, but this was not completed due to lack of funds.Internally, St. Catherine's is a galleried church (a type common in Dublin from the late 17th century) Architects Curdy and Mitchell restored the church in 1877 and during the following decade an interior reordering was undertaken by architect James Franklin Fuller, during which the old box pews were replaced with open ones.The crypt contains the remains of several Earls of Meath.