In a writ filed at the Technology and Construction Court, Deane and Amos claims it is owed ВЈ299, 457.76 for a series of oral contracts agreed between 2005 and 2008.
It wants to recover the money and ВЈ77,237.64 in interest.
DGT Steel and Cladding appointed PricewaterhouseCoopers as administrators last month after suffering cash flow problems.
A PricewaterhouseCoopers spokeswoman said administrators would try to pay creditors if any money remained, but that Deane and Amos would rank equally alongside other creditors seeking payment.
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