Ardmore Construction Group, the building firm founded by Donegal-born brothers Cormac and Patrick Byrne, is preparing to enter administration, a move that has sent shock waves through the construction sector. The company notified the High Court in London on Thursday of its intention to take the step, citing significant potential liabilities linked to alleged historic building defects. Those liabilities have undermined its ability to secure new contracts, prompting the move towards administration. Work has halted on a number of projects as a result, with several group companies set to be affected, including Ardmore Major Projects, Ardmore Hotels and Commercial, Ardmore…