Of that, it owed £4.9m to more than 400 trade creditors and staff.
These will all now be out of pocket.
Building services contractor Rotary (Scotland) has been hit for nearly £300,000 and Caley Timber and Building Supplies will lose £290,000.
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About 240 former staff are unlikely to get the full wages they are owed because of the large shortfall in cash raised from selling assets of UBC.
Even secured creditor Bank of Scotland is unlikely to recoup all of the £4m it is owed, according to a report from administrators at Zolfo Cooper.
The affected firms have had to look on as former UBC directors set up new companies in the wake of the collapse.
A UBC management team bought the surviving main business asset Wyvis Roofing from the administrators.
Former UBC chief executive James Pedrana now heads up new firm UB Herbrides and fellow UBC board director Colin Peteranna runs UB Civils, which have taken on some of the group's former contracts.
(NE)
