New figures show the number of homes impacted by defective concrete blocks has risen to around 9,500.
The detail has been provided by the County and City Management Association (CCMA) to the Oireachtas Joint Committee on Housing, Local Government and Heritage.
The committee is due to meet twice later today to discuss the Defective Concrete Blocks Scheme, which was set up to support affected homeowners to remediate their properties.
TDs and Senators will hear from officials in the Department of Housing, Local Government and Heritage alongside representatives from the Housing Agency, the County and City Management Association, the National Standards Authority of Ireland and Engineers Ireland.
Representatives from the Irish Council for Social Housing, DCB Downgraded, Mayo Pyrite Action Group and Dr Martina Cleary will also appear before the committee this evening.
In an opening statement, Donegal County Council Chief Executive John McLaughlin will say that "estimates from the affected local authorities" indicate the overall figure of combined public and private dwellings affected is in the region of 9,500.
The figure includes 6,500 properties in Co Donegal, 1,100 in Co Mayo, 860 in Co Clare, 700 in Co Limerick and at least 300 in Co Sligo.
Mr McLaughlin will say the figure "applies only to private dwellings and social housing stock" and does not include any approved house bodies stock "at this time".
He will also say that each of the local authorities included in the scheme "are at various stages of implementation" of the scheme.
His opening statement includes updates on applications, approvals, commencements, completions and payments issued up to 31 December last year.
In Co Donegal, the total number of grant approvals increased to 1,375, with the total value of grants approved rising to approximately €479 million, according to the CCMA.
"Over the same period, the total value of payments issued increased to almost €185 million, reflecting a substantial acceleration in on-site remediation activity," it added.
The total value of payments issued in Co Mayo increased to over €69m as of the end of December, "with 141 dwellings fully remediated and a further 115 homes currently undergoing remediation works", the CCMA said.
It noted that the number of applications increased to 178 in Co Clare, with 174 given grant approval with the damage threshold met.
The total value of grant amounts decided to date is more than €23m.
The CCMA said 25 grant approvals valued at approximately €7.2m have issued as of 31 December 2025 in Co Limerick, "with staged payments totalling approximately €0.21 million made to support assessment, ancillary costs and the commencement of remediation work".
The association said the scheme commenced in April 2025 in Co Sligo and to date there have been ten applications received, with nine meeting the damage threshold.
Mr McLaughlin will say while the current scheme applies to privately owned dwellings, "local authorities have identified a number of social housing properties impacted by defective concrete blocks".
He will tell the committee the CCMA "would welcome the development of a dedicated scheme to assist in remediating this public housing stock", adding "it is also acknowledged that there are other buildings such as schools, childcare facilities, etc, affected by defective concrete blocks".
The Irish Council for Social Housing (ICSH) is calling for a grant scheme to be introduced for the social housing sector.
In an opening statement to the committee, ICSH Chief Executive Donal McManus will say the council is calling for the introduction and implementation of a Defective Concrete Blocks Grant Scheme, Social Homes Scheme and accompanying regulations.
He will say the council engaged with the Department of Housing, Local Government and Heritage on the drafting of the scheme in 2024.
"However, despite positive indications then, no pilot or full scheme has been introduced for the social housing sector," his statement will say.
Mr McManus will tell the committee that it is an emerging issue for the sector with "213 confirmed cases of DCB and 124 suspected cases of DCB".
The issue has a "geographical concentration in the northwest and western seaboard areas".
However, as concerns emerge, "we understand that growing numbers of local authorities nationally are being considered for inclusion on the schemes," he will say.
Mr McManus will say it is "essential that preventive and early intervention measures are adopted to ensure as many tenants can remain in their own homes, and in cases where decanting may be necessary that this is considered as a priority category within the social housing remediation scheme".
Committee Leas-Chathaoirleach Seamus McGrath said defective concrete blocks "represent a significant housing challenge in Ireland, impacting thousands of homeowners, particularly in the west and northwest".
"Caused by excessive levels of mica and pyrite, these materials compromise structural safety and long-term habitability," he said.
"The State has responded through the introduction of redress schemes to support the remediation and rebuilding of affected homes," he added.
The Fianna Fáil TD said members of the committee "look forward to a comprehensive update on the implementation of the redress scheme and related matters".
