A man in his 20s was fatally injured shortly after midday at a concrete manufacturing facility in Dalwallinu,about 240 kilometres north of Perth.
The incident,which is understood to have involved a forklift,was attended by police.
Two hours later,a 32-year-old man died at a construction site about 15 kilometres south of Perth in O’Connor.
It is understood he was crushed while working in the basket of an elevating work platform.
Worksafe are investigating.
In a statement released on Thursday,the WA branch of the Construction,Forestry,Mining and Energy Union said its thoughts were with the families and workmates of the two workers and each of the incidents were a reminder of the high-risk nature of the construction industry.
“Every worker deserves to come home safely at the end of the working day to their families and loved ones,” the statement read.
At least 26 people have died at work in Australia so far this year.