EY told PA the construction services company had attempted to find a buyer but failed to secure a suitable rescue deal.
The group, which was in the middle of numerous government projects, including work to prisons, will make the majority of its employees redundant with immediate effect.
Approximately 200 employees will initially be kept on to assist the administrators into winding down the business.
ISG is involved in 69 government projects totalling more than £1 billion, including work on prisons for the Ministry of Justice, data analysts Barbour ABI said.
A spokesperson for the government said: “We have implemented our detailed contingency plans and affected departments are working to ensure sites are safe and secure.”
Source:
www.bbc.com
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