A director of a Wimborne building firm has been fined after a self-employed worker was seriously injured when working on an extension at a local cottage.

Dorchester Crown Court heard that David Mitchell, a director of Ferndown Developments Ltd, had hired James O'Connor, from Winton, to work at the cottage when the incident happened on 29 April 2009.

An investigation by the Health and Safety Executive (HSE) found that the property was on a sloping site and needed excavating below the level of the shallow cottage foundation in order to construct the foundations for the extension.

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Mr O'Connor, 42, was in the process of lowering the ground level when the gable wall collapsed, knocking him to the ground.

At the same time, part of the wall fell through the windscreen of an excavator and activated the reverse lever. Mr O'Connor's leg, which was on the track of the excavator, was pulled in and became trapped between the track and body of the excavator. He suffered shoulder, back and leg injuries and had to have his right leg amputated above the knee.

The HSE investigation found that Mr Mitchell, who had been contracted to carry out the job, did not control the work in a safe manner. He failed to identify the need to support the building during the excavation and foundation stages of the project.

David Mitchell, director of Ferndown Developments Ltd, Park Homer Drive, Wimborne, pleaded guilty to breaching Section 28(1) of the Construction (Design and Management) Regulations 2007 and was fined £2,000 and ordered to pay costs of £18,000.

(CD)