Sheffield Crown Court heard Bullet Scaffolding Ltd was appointed to provide edge protection around the roof of an industrial unit at Aldham House Industrial Estate in Wombwell, Barnsley.
The host company was repairing damaged roof lights and on 3 November 2014 Shane Percival fell through a fragile roof light while working from the roof fixing guard rails.
Percival fell approximately six metres onto a concrete floor and suffered a spinal, life changing injury resulting in paralysis to the lower part of his body.
An investigation by the Health and Safety Executive (HSE) found the company and director failed to adequately plan for working at height or provide a safe system of work.
Bullet Scaffolding Limited of Buckleigh Road, Wath Upon Dearne, Rotherham pleaded guilty to breaching Section 3 (1) of the Health and Safety at Work Act 1974 and was fined £65,000 and ordered to pay costs of £3600.
Tony Jackson of the same address pleaded guilty to breaching Section 37 of the Health and Safety at Work Act 1974 and was fined £5000 and ordered to pay costs of £3600.
HSE inspector Alan Sheldon said: "It was foreseeable that Mr Percival and others could have fallen off the edge of the roof or through a fragile surface.
"The accident was entirely preventable by using a mobile elevating work platform or by constructing an independent scaffold thereby avoiding the need to access the roof.
"As a result of the accident the lives of Mr Percival and his family have been tragically affected."