Window and door fitter Stuart Barnes, which had been contracted to undertake the roof replacement work, was fined £8,000 for failing to plan it safely.
A Health and Safety Executive (HSE) investigation found that 27-year-old Luke Maslen was working on the garage roof when the incident occurred at Courtlands in Portland, Dorset on 5 January 2016. The fragile structure gave way and he fell almost 2 m, sustaining a serious fracture to his upper spine.
The HSE found that Aster Property, as the client, did not control how the work was carried out, which included failing to ensure that Stuart Barnes supervised the roof replacement appropriately and that it completed the work safely. Some of the employees had been trained to fit windows but not work on roofs.
Aster Property, of Horton Avenue, Cannings Hill, Devizes, Wiltshire, pleaded guilty to breaching s 3(1) of the Health and Safety at Work Act and must also pay £5,015 in costs.
Stuart Barnes of Portland Road, Weymouth, pleaded guilty to breaching reg 4(1)(a) of the Work at Height Regulations 2005 and must also pay the same in costs.