The Mechanical Contractors Association of Ontario

The Mechanical Contractors Association of Ontario (MCAO) is an employer organization working for the enhancement of Unionized Mechanical Contractors in the Ontario Construction Industry.

The Association continues to represent the best interests and concerns of our membership through our involvement in ongoing, established activities, as well as our development of, and participation in, several existing new initiatives aimed at improving our industry and level of success in the future.

World Management Team in office silhouette

Learn more about our Annual Meetings

The Canada Ontario Job Grant


 The MCAO/OPTC Provincial Collective Agreement

Management Training for your organization

 MCA Ontario Geographic Scope