The CFMEU has marched on the University of Tasmania and demanded it commit to using locally-made products in its new student accommodation.
ABC News reports around 100 people marched through Hobart to the proposed construction site, with the Construction, Forestry, Mining and Energy Union leading the protest.
The union said UTas would not confirm whether it would use overseas building products on the new project, and it had received a tip-off that the university was looking to China for some materials.
University vice-chancellor Peter Rathjen told ABC News it was too early to confirm the products used in construction.
“We have just started planning for a project and we don't even know what building are going to look like,” he said.
“So far all of the work and all of the materials we've used have been Tasmanian or Tasmanian people and that is our very strong preference.”
The union said Tasmania's economy was "doing it tough" and businesses and workers had to fight to help support local companies.