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The passage of green roof laws could be a boon to the landscape industry as landscape architects and landscape contractors could tap into an ever-burgeoning market. The City of Toronto, Canada passed a new green roof by-law with overwhelming support. The green roof by-law consists of a green roof construction standard and a mandatory requirement for green roofs on all classes of new buildings.
The by-law requires up to 50 per cent green roof coverage on multi-unit residential dwellings over six storeys, schools, non-profit housing, commercial and industrial buildings. Larger residential projects require greater green roof coverage, ranging anywhere from 20 to 50% of the roof area. ?EUR??,,????'??? Courtesy of Green Roofs for Healthy Cities
Francisco Uviña, University of New Mexico
Hardscape Oasis in Litchfield Park
Ash Nochian, Ph.D. Landscape Architect
November 12th, 2025
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