Around 240 householders in Belmayne in Dublin may have to move out of their homes because of fire safety defects.
A layer of fire stop was found to be missing in the floor compartment in one apartment and it is estimated that around 25% of the 960 units could be affected.
A number of residents evacuated from nearby Priory Hall were given temporary homes in Belmayne but is it not known if any of these are affected.
Kitara Ltd trading as Stanely Holdings engaged LM Developments to build the units but that company is in liquidation.
Kitara said in a statement that residents may have to move out of their homes for three or four days for the repair works to be carried out.
It is estimated that in total the works will take three months in a plan that has been agreed with Dublin City Council.