The construction union says it will fight to ensure its members aren’t disadvantaged after part of the building contract for the Perth Airport international terminal expansion was terminated.
CFMEU WA branch secretary Mick Buchan said part of Broad Construction's contract for terminal one had been cut short at 60 per cent completion.
Mr Buchan said he did not know the reasons for the move, but assumed it had to do with not meeting contractual obligations not related to the quality of the work.
Up to 100 workers were affected and the union would try to secure them work with the new construction company working on the site, he said.
"We'll see that our members are not out of pocket at all," Mr Buchan told AAP.
"We plan to meet with whoever picks up the contract to see that those workers aren't disadvantaged.
"We believe that the client has a responsibility to see that the workers who started on the project finish the project."
A Perth Airport spokeswoman said steps were being taken to accelerate the extensive and complex construction work at the international terminal by applying more resources to it, increasing the number of building companies on site.
"This results in changes to the scope of works of some contracts," she said.
"No existing building companies are discontinuing their presence on site."
Broad Construction declined to comment.