Tim Hudak says "Ontario's outdated labour laws threaten to grossly inflate the final bill for the 2015 Pan Am Games."
The PC Leader points to the 155-million dollar Pan Am Stadium project on the Ivor Wynne site.
He says since the United Brotherhood of Carpenters and Joiners of America has an exclusive contract with Hamilton, the City's construction projects must go through the union.
Hudak says it means 95 per cent of qualified professionals are banned from bidding on new projects.
And because of that, Hudak believes the new stadium price tag will be inflated by up to 40 per cent.
Ivor Wynne will be torn down this November and give way to the Pan Am Stadium, which is slated to open it time for the 2014 CFL season.