We are the

Central Ontario Building Trades

A safe jobsite is a productive jobsite.

The COBT represents 25 trade union affiliates and tens of thousands of skilled men and women, united as one voice for the construction industry. We act as the voice for construction workers with government, owners, employers and the public. The COBT is committed to working with our affiliates and employers to assist in establishing joint Health and Safety Committees, Worker Trade Committees and Jobsite Inspections.



The COBT covers Residential, Industrial, Commercial and Institutional construction projects from Oakville to Trenton and north to Parry Sound.

Map of Construction Board Areas of Ontario

Our Trade Union Affiliates

Boilermakers Local 128
Bricklayers Local 2
Electrical Workers Local 353
Elevator Constructors Local 50
Heat & Frost Insulators Local 95
Ironworkers Local 721
Labourers Local 506
Marble Tile Local 31
Millwrights Local 2309
Operative Plasterers Local 598
Plumbers/Steamfitters Local 46
Plumbers/Steamfitters Local 401
Refrigeration Local 787
Sheet Metal Workers & Roofers Local 30
Sheet Metal Local 285
Sprinkler Fitters Local 853
Teamsters Local 230

See All Our Affiliates

Proud Creators ofHammer Heads

Our 12 week comprehensive skills development program is designed to train and place youth, both men and women, from under-resourced and Aboriginal communities in the GTA into registered apprenticeship careers within the skilled construction trades.

Learn More Apply Now

Hammer Heads program

Community Events

Apr 11, 2020

Apr 11, 2020