Housing Agency Chief Executive John O'Connor has said the Government needs to change the way it thinks about providing housing.
Mr O'Connor said that while supplying stock for families must be an immediate priority, there will be smaller households and a greater need for apartment dwellings in the future.
He said that a number of sites for development had been identified around Dublin, in the Docklands, west and north Dublin, and in areas such as Sandyford and Stillorgan.
Up to 25,000 homes need to be built annually to satisfy demand, he said.
He said: "55% of our new housing stock will be needed for single-person households, or two-person households.
"When we include three-person households that will account for 75% of the housing stock.
"So we have to be thinking differently in terms of who we need to be providing housing for. So it's a range of houses for rent, houses to buy.
"We also need to provide more public housing that's affordable," Mr O'Connor added.