Worker killed in WA building accident

A young worker has been killed after a panel fell on him at a construction site, south of Perth.

WorkSafe WA is investigating the 19-year-old's death at a residential site in bushfire ravaged Yarloop on Monday afternoon.

Construction company Gran Designs WA says the accident is 'devastating', and their thoughts are with the worker's family.

The company is conducting an internal investigation to determine what happened.

WA secretary of the Construction, Forestry, Mining and Energy Union Mick Buchan said there was a fatality in the industry every 10 weeks in WA.

"The outgoing government decimated WorkSafe funding, making it even more dangerous," he told AAP on Tuesday.

"We want to see WorkSafe totally restructured from the ground up, to be a proactive agency."

He said the union sent its condolences to the family.