Extra car and bus parking have been approved for Muckross House, a protected area in Killarney National Park.
Fáilte Ireland said more than 500,000 people visited the area in 2017.
The extension of the bus parking site in the demesne area of Muckross alongside the Victorian era house, and other visitor facilities will provide parking for eight additional buses.
Britain's Queen Victoria visisted Muckross House in 1861 and more recent royal visitors were Prince Charles and his wife Camilla.
Lighting and other works will improve facilities at the overflow and existing car parks resulting in the creation of 26 more car spaces .
The application by the Department of Culture, Heritage and the Gaeltacht was appealed by two separate third parties.
The objections centred on the fact this was the second application in the site zoned special amenity and the bus parking and overflow car park would only be needed for three months a year.
Concerns were also raised about the effect on the protected red deer with the removal of grazing land, and traffic, and on run-off of water into the nearby Muckross lake.
However, submissions by the department said deer had now increased to the level that culling was required and the area was not used for grazing.
Fáilte Ireland supported the application saying the overall proposal will contribute and help to support the improving visitor experience at Killarney National Park.
An Bord Pleanála have given the go ahead for the improvements, but have attached conditions including that a tree survey is needed.
