All non-essential work places were ordered to close overnight.
The ecomomy could face up to an additional 150,000 jobs losses if construction sites are forced to close.
That's the warning from the Construction Industry Federation, after concerns were raised about social distancing on building sites.
Earlier, Taoiseach Leo Varadkar said discussions would take place to identify whether particular projects are essential.
All non-essential work places were ordered to close overnight, but it didn't include building sites.
Director General of the CIF, and Offaly's Tom Parlon insists the industry is taking the threat of Coronavirus seriously:
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