Permission for the new runway, which will be built 1.6km north of the current main runway, was originally granted in 2007 with 31 conditions attached. The economic downturn and the subsequent fall in passengers coming through the airport saw the plans put on hold.
Passenger numbers at the airport have grown in the past two years.
The new runway is expected to be completed by 2020, and it will cost around €320 million.
However, the airport authority warned that two of the conditions attached to the planning permission were “onerous” and would severely reduce the future operational capacity of the airport at key times.