Cork County Hall was officially opened on the 16th of Apil 1968 by Mr. Martin J. Corry T.D., Chairman of Cork County Council, in the presence of the County Manager Mr. Michael Conlon and the elected members. The original County Hall was designed by Mr. P. L. McSweeney, Cork County Architect and the General Contractors were P.J. Hegarty & Sons, Ltd. Cork. The re-developed Cork County Hall was officially opened on the 26th of June 2006 by Councillor Michael Creed, Mayor of the County of Cork, in the presence of the County Manager Mr. Maurice Moloney and the elected members. The re-development works were designed by Shay Cleary Architects and the General Contractors were Rohcon Ltd.
County Hall stands 65 metres tall, Ireland's tallest building for forty years until the Elysian Tower (81 metres) in the city centre was completed in 2008.