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A statement of affairs posted at Companies House reveals the firm had debts of £4m when it went under.
Money owed included £640,000 in unpaid bills across more than 90 firms in the supply chain.
CBS had been in business since 2012 offering a fully integrated mechanical and electrical engineering and contracting service.
Recently completed projects included a £1.3m MEP package for Consortia on an apartment complex in Birmingham and a £4.5m job for Elliott Group on a large residential job in Worcester.