A claim for compensation via civil courts may be made over the death of a worker.
Paul Alker tumbled through a skylight on the roof of a Comet store in 2007 and Judge Rhys Rowlands acknowledged that money may be sought by his relatives.
His comments came after the electrical chain - which has 250 shops in the UK and is part of pan-European group Kesa Electricals - was fined £75,000 and ordered to pay costs of £25,000.
According to Judge Rowlands, the fall was "an accident waiting to happen".
He added: "If anyone would have visited the site it would have been immediately apparent that there were totally unacceptable risks being taken."
An investigation into the incident revealed Mr Alker and a colleague had not been supplied with roofing harnesses.
The labourer sustained fatal injuries after plummeting 7.3 metres.
Meanwhile, Comet company secretary Andrew Stoodley claimed a review has since taken place and a "robust contract management system" has been instigated.
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