The 52-year-old plumber, from Solihull, who does not wish to be named, was inspecting a gutter for Whitefriars Housing Group at a house in Coventry on 6 June 2011 when he fell.
He broke his pelvis and was in hospital for four months.
The Health & Safety Executive (HSE) prosecuted Whitefriars Housing at Coventry Magistrates' Court after an investigation found that the base of the ladder had not been properly secured.
The court heard that employees had not been given any instruction or equipment to enable them to secure their ladders effectively. Specifically the company had failed to provide standoff devices to allow employees to work around guttering without resting the ladder against the guttering, which is inherently unstable. In addition the company had not undertaken suitable routine monitoring to check if their employees were working safely.
The court was told that Whitefriars Housing does a lot of work at height but it was not properly planned, organised or carried out safely.
Whitefriars Housing Group Ltd, of Little Park Street, Coventry, was fined £15,000 and ordered to pay £5,980 in costs after pleading guilty to breaching Section 2(1) of the Health and Safety at Work etc Act 1974.
After the hearing, HSE inspector Ed Fryer said: "A housing group doing such regular work at height should have known better, but as it was the work was not properly planned, organised or carried out in a safe manner, which resulted in this entirely preventable incident and a serious injury for the worker.
"Falls from height are the biggest cause of death and injury in the workplace and it is vital to plan effectively. As this incident shows, you cannot leave it to chance when the consequences are so severe."
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