The Supreme Court has ruled that a law which allowed for registered employment agreements which sets rates of pay in certain sectors is unconstitutional.
The court found that Part II of the Industrial Relations Act of 1946 unconstitutional because it delegated the power of legislators to the Labour Court.
The office of the Minister for Jobs, Enterprise and Innovation in a statement said that it would be seeking legal advice.
The statement added: "The judgment has the effect of striking down Registered Employment Agreements put in place under the 1946 Industrial Relations Act. Agreements which set pay and conditions for workers in five sectors including electrical contracting and construction are affected by today's judgment.