Toronto Institutes Green Roofs With City Hall Example

Last year Toronto became the first North American city to mandate green roofs on all new residential, commercial and institutional buildings larger than 21,500 square feet. Now it has created a 118,000 square foot example on top of the City Hall.

1 minute read

October 2, 2010, 11:00 AM PDT

By George Haugh


"The $2.2 million garden has been drawing thousands of visitors since it opened in May-more than 10,000 people on the first weekend alone," reports Tim Keough.

"The city has really been pushing the green side of construction and wanted to lead by example," says Bruce Bowes, Toronto's chief corporate officer. "A number of projects have been undertaken at city hall. One is the roof podium. Others include hooking up to a deep-lake water-cooling system and adding building-automation systems."

Two local firms, Plant Architect and Shore Tilbe Perkins + Will, planned the new rooftop oasis and are leading the larger transformation of the square below.

The Finnish architect Viljo Revell, who completed Toronto's modernist city hall in 1965, had always intended for the podium roof to be publicly accessible, but "it had been closed off for about fifteen years," says Mary Tremain, a partner at Plant.

Wednesday, September 15, 2010 in Metropolis Magazine

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

White Waymo autonomous car driving fast down city street with blurred background at night.

Seattle's Plan for Adopting Driverless Cars

Equity, safety, accessibility and affordability are front of mind as the city prepares for robotaxis and other autonomous vehicles.

June 16 - Smart Cities Dive

Two small wooden one-story homes in Florida with floodwaters at their doors.

As Trump Phases Out FEMA, Is It Time to Flee the Floodplains?

With less federal funding available for disaster relief efforts, the need to relocate at-risk communities is more urgent than ever.

June 16 - Governing

People riding bicycles on separated bike trail.

With Protected Lanes, 460% More People Commute by Bike

For those needing more ammo, more data proving what we already knew is here.

June 16 - UNM News