A leading environmental group has joined those objecting to the use of the National Museum to rehouse the Seanad during renovation works at Leinster House.

An Taisce says that the proposed works to facilitate the Seanad would require major changes to the protected structure.

Authorities have applied for planning exemptions to occupy one of the galleries, create new entrances and to attach a lift to the façade.

Dr. Mark Clinton, of An Taisce's Monuments & Antiquities Committee, says permission should be refused as the works will alter the character of the building: