N C Tucker, of The Cottage, Guildhall Lane, Wedmore, pleaded guilty to an offence under Section 2(1) of the Health and Safety at Work etc. Act 1974.
It was fined £26,000 with over £3,700 in costs.
Bristol Crown Court heard how the 25-year-old employee fell five metres through a roof light at a farm during work in August 2014.
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This was his first roofing job, having only worked for the company for four weeks prior to the incident.
He suffered a brain injury, a fractured spine and broken ribs.
Health and Safety Executive (HSE) Inspector Sue Adsett said: "The young man who fell has had life changing injuries which have severely affected him and his family. The use of nets to protect against falls through fragile roof lights is well- established in the industry, if nets had been in place this accident would have been prevented."
(LM/MH)
