KML has been fined £14,400 and ordered to pay £1,276 in costs after employees were discovered to be working at a dangerous height.
Health and Safety Executive (HSE) inspectors visited the former aerospace plant site in Lancashire after responding to a complaint.
Inspectors observed a worker stripping slates from a fragile roof without any measures in place to prevent the man from falling.
The company pleaded guilty to a breach of Work at Height Regulations along with two breaches of the Construction (Design and Management) Regulations 2007.
HSE Inspector Jacqueline Western, who investigated the case, said: "These breaches of health and safety legislation were entirely preventable.
"Falls through fragile roofs are a common cause of work-related death or personal injury."
The HSE states 45% of deaths on construction sites in Britain last year were as a result of falls from height and 581 workers suffered major injuries as a result of such falls.
(LM)
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