1804 – Charitable Infirmary, 14 Jervis St., Dublin The hospital was founded by six Dublin surgeons as the Charitable Infirmary in Cook St., Dublin, in 1718, at their own expense.
1804 – Christ Church, Church of Ireland, Fermoy, Co. Cork Architect: Abraham Hargrave Church of Portland stone with tower and spire on the site of 13th century Cistercian abbey.
1804 – Clandeboye, Bangor, Co. Down Architect: Robert Woodgate Ballyleidy House was extensively remodelled and extended for 2nd Baron Dufferin, to form a substantial L-shaped building consisting of a 7-bay southern range and 9-bay range to the east.
1804 – Fever Hospital & House of Recovery, Cork St., Dublin Architect: Samuel Johnston Constructed 1801-1804, as a Fever Hospital and House of Recovery. The House of Recovery was converted in 1881 by Sandham Symes into the Dublin Convalescent Home.
1804 – Holy Trinity Anglican Cathedral, Quebec City, Quebec Architect: Captain Hall and Major William Robe Designed in the neoclassic Palladian style, the Cathedral was modeled after the famous church of St.