Surrey firm Fine Construction has been fined £15,000 after an employee was paralysed in a 3 metre fall.
City of London Magistrates Court heard the worker had been building an extension to a domestic property in Popes Lane, London, in February 2008 when he fell through a roof light void.
There was no boarding to cover the roof lights and no crash deck underneath to limit the impact of a fall.
Health and Safety Executive inspector Kevin Shorten said the man suffered serious back injuries as a result of the fall and no longer has use of his legs.
He said: “Forward planning, vigilance and a willingness to spend time and money on suitable safeguards could prevent incidents like this one and avoid the personal and financial trauma associated with them.”
Fine Construction pleaded guilty to breaching the Health and Safety at Work Act. In addition to the fine, it was ordered to pay more than £8,000 in costs.