Plans to improve the café at the summit of Mount Snowdon have been given a £3m boost by the Welsh Assembly Government.
The new café could be completed by 2007
The cash, set aside in the draft budget, was announced by Environment Minister Carwyn Jones.
Planning permission to redevelop the existing café, labelled "the highest slum in Britain" by the Prince of Wales, was granted in January.
The proposed scheme will see it replaced by an £8m building finished in stone and glass.
Aneurin Phillips, chief executive of Snowdonia National Park Authority (SNPA), said the contribution showed the importance of the project to the whole nation.
"Not only will the residents and businesses within the communities of Snowdonia benefit from this investment, north Wales and Wales as a whole will also benefit," he said.
He said it would "ensure the summit will have a new building that everyone will be proud of".
Snowdon attracts more than 350,000 visitors each year, and the café was built in 1935 by Sir Clough Williams-Ellis, who was also behind the picturesque Italianate village of Portmeirion.
Previous attempts to redevelop it failed because of a lack of cash.
Work on the new building is expected to start next September, and finished by June 2007.
The £3m from the assembly government will be added to £1.24m which has been secured by grant offers from the Wales Tourist Board, Welsh Development Agency and Snowdon Mountain Railway.
Other money will come from Snowdonia National Park Authority, and applications are being made for the Heritage Lottery Fund and Objective One European Funds.
The current café will be demolished
"Securing such a magnificent building as this on the summit of Snowdon will add and improve the experience, understanding and the enjoyment of future visitors to Snowdonia," added Mr Phillips.
Mr Jones said the improvements were "essential to Snowdon's international reputation as an outstanding visitor attraction".
"Accessibility to the mountain summit, both to visitors and locals, is vital," he said.
"I hope that the cash injection from the Welsh assembly government will encourage other investors to come forward."
Conservationists say they want great care taken to ensure any new building does not detract from the beauty of the mountain.