One of the most controversial parts of the plan to fund the repair of homes built with defective blocks looks set to be dropped.
The sliding scale element is now unlikely to form part of the final compensation package for mica homeowners, which was capped at €420,000 per home.
The scheme announced by Government last year proposed that grants would cover rebuilding costs at €145 per square foot on the first 1,000sq/ft, €110 for the next 1,000sq/ft and €100 thereafter for the remainder of the property.
However, Minister for Housing Darragh O'Brien has written to the Mica Action Group to tell them that the Society of Chartered Surveyors Ireland (SCSI) does not use sliding scales in construction cost reports.
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Mr O'Brien told the campaign group that the final scheme will be based on the SCSI's analysis, which is set to be completed by the end of the month.
The new scheme could instead see payments based on eight different types of homes.
Campaigners are expected to make a submission to the SCSI later this week.
Work on the legislation which will underpin the €2.2 billion scheme is ongoing, with Government aiming to bring it to the Dáil as quickly as possible.
However, senior coalition figures have indicated that there is "still a bit to go" before it reaches that point.
More than 7,000 homes in several counties including Donegal and Mayo are affected by mica.