D & R Maintenance Solutions Ltd and John Dunmore were prosecuted by the HSE after the incident which occurred while solar panels were being fitted to the roof of a barn at Claverdon, Warwickshire, on 24 February 2012.

The 36-year-old man from Monmouth was carrying a solar panel when he fell through the fragile roof of the barn, landing on the concrete floor below. HSE found little had been provided to protect workers from falls.

As well as fracturing two vertebrae in his lower back, requiring a brace to be worn for two months, he suffered a broken wrist which had to be pinned and a bruised heel.

He returned to work after six months but no longer works in construction, and has been left with some restricted movement in his wrist.

Leamington Spa Magistrates Court heard the company and its managing director, John Dunmore, were aware the roof was fragile and verbally warned employees to be careful, but did not ensure that the job was properly planned or carried out safely.

HSE found equipment provided for accessing and working on the fragile roof was not suitable, and four employees were working unsafely using single scaffold boards and crawl boards without guardrails or harnesses, and at times stepping on the roof itself.

No guardrails were in place around the roof perimeter to prevent falls from the edge, and no measures to mitigate the consequences of a fall through the fragile roof were in use, such as fall arrest harnesses, netting, or soft landing systems.

The injured man and another colleague were both working for the firm for the first time that day but neither had been given proper instruction or training for working at height.

D & R Maintenance Solutions Ltd of Cross Vane, Penalt, Monmouth, pleaded guilty to breaching Regulation 4(1) of the Work at Height Regulations 2005 and was fined £13,000 and ordered to pay £3,357 costs.

John Dunmore, 54, of Penalt, Monmouth, pleaded guilty to breaching Section 37(1) of the Health and Safety at Work etc. Act 1974 and was fined £7,000 and ordered to pay £3,357 costs.

After the hearing, HSE inspector Luke Messenger said: “D & R Maintenance Solutions Limited, and Mr John Dunmore, its managing director, had received relevant previous verbal and written advice from HSE regarding work on fragile roofs but failed to take basic precautions to prevent falls.

“As a result, an employee was injured on his first day with the company. Considering he fell 4.5 metres, he was fortunate not to suffer more serious or even fatal injuries.”