The Romanian national, who asked not to be named, fractured two vertebrae and broke five ribs in the fall at a building on Farringdon Road in Farringdon on 19 April 2011.
Westminster Magistrates' Court heard that he was part of a crew of labourers working for Swanley-based MJM Fitout Ltd to remove ventilation ducting from the basement of a two-storey gym.
A scaffold tower was erected to support the work and was being used by the worker to access ducting from a ceiling above a squash court. However, it was knocked over as he worked at height and both he and the tower crashed to the floor below, a distance of some 4.5 metres.
An investigation by the Health & Safety Executive (HSE) identified that none of the temporary labourers was competent to erect a scaffold tower, and that it was constructed without adequate supervision.
A district judge was told the incident could have been prevented had the work been properly planned, managed and monitored by MJM Fitout.
The company, of Horizon House, Azalea Drive, Swanley, Kent, was fined £8,000 and ordered to pay £3,500 in costs after pleading guilty to a single breach of the Construction (Design and Management) Regulations 2007.
After the hearing HSE inspector Keith Levart said: "The worker suffered painful injuries that could have been avoided had the labour crew been properly managed, and had their work on site been adequately monitored by MJM Fitout Ltd.
"The temporary staff had effectively been left to their own devices and were working in an unplanned and unsafe manner. It illustrates the clear need for companies to have practical arrangements in place to ensure that all personnel involved in and undertaking construction work understand what is expected of them, and are able to co-operate and communicate with one another.
"Work at height from scaffolds poses clear risks, and should only ever be undertaken by competent personnel with the right equipment, knowledge and experience."
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