The heartbroken mother of a teenage boy who fell to his death has spoken for the first time since his death, revealing he was scared for his safety at work.

Regan Ballantine's 17-year-old son, Wesley, died in January 2017 when he fell through a skylight during a renovation of a Perth H&M store.

Unconscious, Welsey was rushed to Royal Perth Hospital, but was unable to be revived.

On Friday, Ms Ballantine revealed to a Senate committee that her son had come to her only eight days before the accident, saying: 'Someone is going to get killed.'

'They're hella reckless mum, no one wears a harness,' Wesley told his concerned mother.

Working the overnight shift, Wesley was not wearing a safety harness while he was installing a skylight 12metres off the ground at about 4.30am.

He fell, and was later pronounced dead at Royal Perth Hospital.

Speaking publicly for the first time since her son's death, Ms Ballantine is telling her son's story to raise awareness for workplace safety laws and regulations, PerthNow reported.

She told a Senate committee, which is assessing Western Australia's industry deaths, that her son had been too scared to tell his boss he was concerned.

She is seeking reforms to safety and training requirements for workers, wanting to implement an anonymous hazard reporting option.

'Had a tip-off line been in place, I believe my son would have been here today,' she said.

Wesley's father, Tyrone, only found out about his son's death when a 'tribute' appeared on his Facebook.

He demanded answers, saying: 'I feel robbed. I felt like someone stole my son from me... Killed him because of these shortcuts.'

Construction Forestry Maritime Mining and Energy Union State secretary Mick Buchan said the union was committed to improving workers' safety.

'We have seen too many lives wasted and we see the laws that are in place now act as no deterrent,' he said.

The State Government has implemented stricter penalties for businesses that broke workplace safety laws, Industrial Relations Minister Bill Johnston said.

They are also looking into further preventative measures.