Philip Evans, from Penarth, South Glamorgan, was working for subcontractor London Fenestration Trades on the Sir Robert McAlpine job.
The work involved undertaking repairs to a glass façade above an entrance to a department store in Princess Hay, Exeter on 9 November 2011.
While a colleague worked on a higher part of the curtain wall from a mobile working platform, Mr Evans worked from the glass canopy to attach the lower fixings.
During the course of this work, he walked along the canopy from right to left and fell through an opening above the Bedford Street entrance of the Debenhams store.
At the Health and Safety Executive (HSE) prosecution, Exeter Crown Court heard the opening had been created during previous maintenance works when a pane of glass had been removed from the canopy and was not replaced.
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Mr Evans fell approximately 4.5 metres through the canopy on to the granite setts below.
He received serious injuries as a result of the fall and later died in hospital.
A HSE investigation discovered the mobile platform provided for the works was inadequate.
The glass canopy on which Mr Evans was working was found not to be a safe working platform as there was no edge protection and there was also the large opening which he fell through.
The court was told neither of the two workers should have left the safety of the working platform basket.
Sir Robert McAlpine Ltd of Yorkshire House, Grosvenor Crescent, London pleaded guilty to breaching Section 3 (1) of HSWA 1974. It was fined £200,000 with £17,790 costs.
London Fenestration Trades Ltd of Clare Road, Grangetown, Cardiff pleaded guilty Section 2 (1) HSWA 1974. However, as the firm is in liquidation the court could only notionally fine it £200,000 with £17,790 costs.
HSE inspector Jonathan Harris said: "The risks associated with work at height are very well known and recognised in readily available guidance.
"Planning and effective coordination between contractors is a requirement of the relevant safety regulations. Without such planning and sufficient assessment of risk, it is foreseeable that working at height will expose operatives to risks to their safety.
"In this case Mr Evans was working from an unsafe position which exposed him to the potential of falling from the edge of the glass canopy as well as the opening through which he tragically fell."
(LM)
