The cost of redeveloping Landowne Road will be just over €70 million more than estimated.
Minister for Sport John O'Donoghue today unveiled the final plans for the 50,000-seater stadium - to be used primarily by Ireland's rugby and soccer teams.
But at €365 million, the cost of redevelopment is more than the €292 million originally envisaged. Philip Browne, chairman of the Lansdowne Road Stadium Development Company, said: "This is a very different stadium to the one which we looked at in our original feasibility study."
Mr O'Donoghue said the arena would be a superb modern sports ground. "This is another major piece of sporting infrastructure in the city of Dublin which will be enjoyed by all Irish people.
"We can be proud of this imaginative and attractive design. It is a superb modern structure and one which I hope will come to be an icon for Irish rugby and soccer followers," the Minister said.
The stadium will be made up of continuous curved stands enclosing all four sides of the ground. The south, east and west stands will have four tiers, with the bottom and top levels holding most spectators.
The north stand will sweep down to one low level of seating, allow plenty of sunlight onto the playing surface and minimising the impact on residents close to that end of the ground.
Mr Browne said: "We believe the team has taken on board many of the concerns and have addressed them without compromising their design. They have also built in a great deal more facilities than we originally had hoped for. This in turn has given us a wider range of funding opportunities."
Some 10,000 seats will be set aside on the second tier for premium ticket holders while the third tier will cater for around 1,300 corporate visitors with hospitality facilities.
The ground will provide better disabled access, press facilities for up to 300 and improved player facilities for both home and away teams.
It is hoped work on the stadium will begin in early 2007 and that it could be ready to host major soccer and rugby games in 2009. The existing stadium will host matches during 2006.
But the residents' association in the exclusive Dublin 4 area where the stadium is situated could be a major hurdle to securing permission for the building.
The stadium is being co-developed by the Irish Rugby Football Union and the Football Association of Ireland and grant-aided by the State.
If the planning process stays on schedule, then the work is expected to begin in 2007 with completion by 2009. The international rugby and football teams may play at Croke Park during that time after the GAA scrapped its controversial Rule 42 in April.
Additional reporting PA