About
Doors Open Ontario

Doors Open Ontario was launched in 2002 by Ontario Heritage Trust and has attracted nearly 2.5 million visitors across the Province. Ontario Heritage Trust celebrated its 40th anniversary in 2007 and has added a Green Buildings feature to this year's tours.

The Clean Air Partnership is working with Ontario Heritage Trust to identify and recognize the green buildings so that visitors can enjoy and learn about buildings and systems that promote sustainable way that buildings can work with our environment.