Trump International Golf Links (TIGL) sought permission to carry out the works previous year over fears that winter storms could wipe out metres of the facility's beach.
Trump had initially requested permission from Clare County, where his golf course Trump International Golf Links Doonbeg is located, to build a 28km long sea wall. The resort sea walls approved by the local council in Clare consist of two lower, hidden sea walls; one will be 2,000 feet long and the other 840 feet long.
Although Mr Trump has said he is not a great believer in man-made climate change, in the original application he cited global warming and rising seas as a reason for needing the wall. Objectors may appeal the decision within a month. Environmental groups are concerned the wall could damage wildlife habitats. They will be placed on the "landward side of a public beach" and would serve to protect holes one, nine and 18 on the course from erosion.
"It's disappointing. We should be altering the golf course not the coastline", said Green Party Leader Eamon Ryan.
President Donald Trump's sons, Eric and Donald jnr, are among the directors of TIGL Ireland Enterprises, according to company records.
Details of the planning application became available on the Clare County Council website at 9am this morning.
Ireland has permitted the businessman and US President to build two scaled-down sea barriers to protect his Doonbeg golf course in Ireland. "Building a barrier in the middle of the beach is going to change the whole way the dune system works", Ryan said in a statement.
A council spokesman said: "Clare County Council has today issued a decision to grant permission for the development of coastal erosion management works at, and adjacent to, Carrowmore Dunes, White Strand, Doughmore Bay and Trump International Golf Links and Hotel, Doonbeg, Co".
Joe Russell, general manager of Trump Doonbeg, said: "This decision demonstrates the council's commitment to support local business and protect the economic future of the region". "Local jobs would be better protected by adjusting the course to the evolving natural world".