Three quarters of delegates backed a Central Council motion at Congress to introduce the change for the next three seasons.
Teams in Division Three and Four of the League will play in the new 16 team second tier, unless they reach their provincial final.
A Tipperary motion was carried to determine that Tier Two standings will be determined at the end of the League rather than at the start.
Parents Reminded Wicklow SENOs Can Issue Letters Of Eligibility
Wicklow on High Alert With Wind And Rain Warnings In Place – No Incidents Overnight
Snow May Fall On Wicklow Mountains Tonight
Tánaiste Announces near €19 million Investment in Wicklow Roads
Arklow Crowned Ireland’s Top Town for Work-Life Balance