A Melbourne demolition company has been fined $45,000 after a skid steer loader tipped and fell onto a worker last year, crushing his leg which was later amputated.

Worksafe Victoria on Friday said Prahran company PPK Demolition pleaded guilty to failing to provide a safe work environment in the Melbourne Magistrates Court last week.

The incident happened in March last year while the company was carrying out demolition work on an old structure at the rear of a property in Prahran to make way for a double-storey extension.

Worksafe says the worker, who was 22 at the time, loaded a piece of concrete weighing 920kg into the bucket of the machine, which exceeded its rated operating capacity of 748kg.

It tipped and crushed his leg.

WorkSafe Executive Director Health and Safety Marnie Williams said it was critical for employers to ensure everyone on site understood the risks associated with operating heavy vehicles and machinery.

“A young man lost his leg because a discussion about safe operation of this machine was not had,” Ms Williams said.

“Construction and demolition are high-risk due to the heavy machinery and vehicles involved, which means assumptions should never be made as they can turn a high-risk task into a deadly one.”

Workplace safety was everyone’s responsibility, she said.