The renovation of the Ceramics Room in the National Museum of Ireland on Kildare Street, Dublin has been completed at a cost of €1.2 million.

The room will become the temporary home of Seanad Éireann from next Tuesday when the Upper House returns from its summer recess.

Originally the Duke of Leinster's ballroom in Leinster House, the Seanad Chamber closed in July for essential maintenance works.

The move to the adjoining building garnered public criticism from former Director of the National Museum, Dr Pat Wallace who claimed it was an intrusion on a "sacred place".

The current Seanad contains "national treasures" who will "find themselves at home" in the National Museum, according to the Cathaoirleach of the Upper House, Senator Denis O’Donovan.

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Sentiments echoed by the Ceann Comhairle Seán Ó Fearghaíl, who is also the Chairperson of the Houses of the Oireachtas Commission.

Speaking to RTÉ he said: "I can assure you there are no fossils or artefacts in the current Seanad."

The refurbishment of oldest part of the historic Leinster House has been proposed for decades. Postponed during the recession, the first phase involves the relocation of the Seanad.

Mr Ó Fearghaíl admitted "considerable controversy surrounded the proposal to come to the National Museum," and said the Oireachtas is particularly grateful to the museum staff and "very interested parties like Dr Pat Wallace, who understood the nature of the project."

He added, "I think our relationships with the neighbours have been vastly improved as a result of the interaction that has taken place between us.

"When we leave here, and we are promising to leave here as soon as the Leinster House renovations are complete, we will be leaving behind a Ceramics Room that is vastly improved than what existed before we came here."

Arising out of the controversy a forum to promote relationships between the Oireachtas and neighbouring national cultural institutions such as the National Gallery, the National Library and the National Museum has been established.

The cost of adapting the Ceramics Room for use by the Seanad was originally estimated to cost €1.5m. The Ceann Comhairle said the Oireachtas Commission is "quite happy" that it came in at €1.2m.

Mr O'Donovan stressed: "It's a temporary home that we are grateful for. We are not quite sure when we will vacate but the plan is early 2019."