The Minister for Housing has met with construction and property experts to identify ways to accommodate Ukrainians arriving in Ireland.

In a letter inviting stakeholders to the meeting, seen by RTÉ News, Darragh O'Brien said he had launched a "Call for Buildings" as part of an effort to identify vacant stock.

He said it was not possible to quantify the impact of the war in Ukraine on the housing system in Ireland and a menu of options was now required to help accommodate people in the medium to long-term.

Mr O'Brien said that first and foremost, the sector needs to maximise use of vacant properties.

Other possible actions include the use of temporary structures on serviced land and accelerating the building of new homes.

Arriving at the meeting in Dublin, Minister O'Brien said all of this must be done while protecting efforts already under way as part of the Government's 'Housing for All' plan.

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Meanwhile, Minister for Children Roderic O'Gorman said that almost half of those who have made pledges of accommodation have now been contacted and it is expected that everyone who made pledges will have been contacted by the end of the week.

Speaking on RTÉ's News at One, Mr O'Gorman said that 21,000 Ukrainian refugees have so far arrived in Ireland and 13,400 are in State provided accommodation, mainly hotels and B&Bs across the country.

Some are also being accommodated in larger institutional settings that have been adapted.

Mr O'Gorman said that "numbers are tight" and the focus is now shifting to those who have pledged accommodation.

He added that the number of Ukrainians arriving in Ireland in the past week has been lower than the previous two weeks, but this could change as there is "an expectation of greater levels of fighting".

He said the Department of Housing is looking at the long-term provision of accommodation, but it may be necessary to use large accommodation centres, such as at Millstreet in Cork.

He said that it is "not ideal" but ensuring shelter and safety is the priority.