Brian Dolan, 58, from Warwick, fractured his skull in two places, broke five vertebrae and three ribs, and suffered hearing impairment in the incident at Blundell Street in Islington on 1 March 2012.
He was hospitalised for more than a fortnight and was unable to work for seven months.
Westminster Magistrates' Court heard that self-employed labourer Mr Dolan was working for Rugby-based Grenergy Solar Ltd to help install 342 solar panels on the roofs of two warehouse buildings.
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His fall occurred on the second day of the work when he plunged almost five metres to the concrete floor below. A pallet of flour in the warehouse partly broke his fall, but not enough to prevent serious injury.
Precisely how he fell is unclear, but a subsequent investigation by the Health and Safety Executive (HSE) identified that irrespective of what happened there were no measures in place to prevent or mitigate a fall, such as safety netting beneath the skylights.
Magistrates were told that had the work been properly assessed, with appropriate safety measures taken, then the incident could have been avoided.
Grenergy Solar Ltd, on Main Street, Thurlaston, Rugby, Warwickshire, was fined a total of £12,000 and ordered to pay £9,041 in costs after pleading guilty to two separate breaches of the Health and Safety at Work etc. Act 1974.
(CD)
