Dún Laoghaire Rathdown Council has applied to the Minister for the Environment for permission to resume work at Carrickmines Castle in south Dublin in order to complete the M50.
Construction work has been suspended since a recent Supreme Court ruling that put a block on further development pending a High Court case.
However work could resume before that date if the Minister for the Environment, Martin Cullen, gives the go ahead to the Council.
The Council's application, which was submitted to the Minister late this afternoon, is lengthy and includes maps of the medieval site which environmentalists are trying to save.
The Council told the Supreme Court that delays in handing over the site to the firm due to build the M50 is costing it tens of thousands of euro every week.
