Siptu has called on the Central Bank to abandon plans to require home buyers to have a 20% deposit to buy a house.
The Central Bank governor Patrick Honohan said a decision will be made in the “coming days”.
The new rules are designed to cool a recovering housing market.
But Siptu General President, Jack O’Connor said, if implemented as currently envisaged, “would put home ownership beyond the reach of thousands of individuals and couples.