Hunter subcontractors are seeking state government intervention following the collapse of National Buildplan Group.

The Group was working on the 15 million dollar GP Super Clinic and Healthcare One Centre in Raymond Terrace when they filed for voluntary administration.

Subcontractors are owed up to one million dollars, but Assistant Secretary of the CMFEU, Rebel Hanlon says it is unlikely the will be paid.

He believes it is time for the state government to step in pay the money that is owed to workers so their businesses remain viable.