New upgrades to Terminal 1 at Dublin Airport will increase its energy efficiency 25 percent more than current standards.
There are plans to replace the core facade, and the roof of the building with a new modern structure.
It was first built in 1972 and Dublin Airport Authority says planning permission has now been lodged to Fingal County Council.
Chief communications officer with DAA, Paul O'Kane said the development was needed.
"This building was designed in the 1970s when we didn't have much knowledge on energy efficiency," he said.
There is no price being put on the cost the upgrade, until it is approved.
Plans have been lodged to replace the roof and change the design of the building.
Mr O'Kane said "All we've done is sought planning for the project and we are going through that process."
The upgrade will have a "huge impact on the visual look of the terminal".
Mr O'Kane promises that it will look "completely different."
Although the aviation industry has taken a serious hit from the impact of the Covid-19, the DAA wants to think long-term.
"If you operate an airport you operate one not just for today or tomorrow."
"You need to look 10 or 20 years into the future," he said.
