Manchester and Salford Magistrates’ Court heard how the conditions on the site, where a former pub was being changed into two houses, were so poor it prompted a a member of public to complain to the local authority.
The HSE inspected the site and had to stop all the work on the building as the conditions were so dangerous and putting workers lives at immediate risk.
In total HSE inspectors served three prohibition notices and two improvements notices for safety failings including work at height issues, missing floorings with no protection and health failings including the provision of welfare facilities with running water.
Inspectors also found an extremely unsafe wall on the property that had not been sufficiently supported to prevent it from collapsing.
The HSE investigation found that both the company and its director did not put in place effective health and safety management at the start of the conversion.
They failed to notify HSE of the project, appoint a competent principal contractor or ensure they had suitable and sufficient measures to reduce risks to workers and members of the public.
Bluefig Development Ltd, of Dale Street, Manchester pleaded guilty to CDM breaches and was fined £42,900 with £3,781.24 costs.
Company Director Faris Mousa pleaded guilty to two safety charges and was fined £40,000 with £3,658.24 costs.
HSE inspector Deborah Walker said after the hearing: “Bluefig Development Ltd and Mr Faris Mousa completely failed in their duties to protect the workers or members of the public from harm.
“This was an extremely dangerous site and it is only luck that nobody was injured or even killed.
“Anyone involved in construction, no matter what size of site or project has to take the health, safety and welfare of their workers seriously.
“If the unstable wall had collapsed we could now be talking about the tragic death of a worker and its impact on their family rather than how lucky they are no-one was injured.”