Green Roof requirements have been included in the Town of Ajax Green Development and Environmental Design Guidelines (GDEDG) for Mid- to High-Density Residential and Non-Residential applications. For example, tier 2 (core) - 10% of the available roof area is a green roof.
Green Roof Requirements in GDS / By-law
Aurora's Green Development Standards have Green Roof Requirements. For example, Tier 1 - Roof areas are provided with one or a combination of the following covering 30% of available roof space (excludes mechanical): Green Roof, Solar PV or thermal and Cool Roof. Tier 2 is more rigorous in terms of minimum coverage percentage.
Brampton's Sustainable New Communities Program has Green Roof Requirements. For example: 4 points are given if 50% of the rooftop is green; and 6 points are given if 75% of the rooftop is green.
Burlington City Council directed staff to draft a business case to prepare a green roof by-law and green roof construction standard in 2023. Further, the Council has approved the incorporation of green roof metrics into the voluntary requirements of the Sustainable Building and Process Guidelines.
Kings' GDS Program has a Green Roof Requirement. For example, as part of Level 1 targets: 75% of the available roof area has a cool surface, or 50% of the total available roof area is vegetated (green).
The City of Kingston has a By-Law No. 8499: Green Roofs and Other Rooftop Elements, which states: i. Architectural appurtenances to support green roofs, other rooftop sustainability elements, or rooftop amenity spaces shall be permitted to exceed the maximum allowable building height by up to 3.5 metres.
The Town has a Local Impact Development Policy, 2017, with a secondary plan encouragement of green roof use (internal document).
The High-Performance Development Standards have Green Roof Requirements. For example, in Tier 1: a Green roof should cover at least 50% of available roof space.
Integrated Sustainable Design Standards, 2022 has Green Roof Requirements. For example, for MURB green roof should cover at least 50% of available roof space, or a combination of a green roof, cool roof and solar PV installed for at least 75%.
Sustainability Metrics Program (SMP) Guidebook has green roof requirements set in metric IB-8. For example, MURB (min): Provide garden space that is equal to 25 square meters or 269 square feet of the rooftop or total landscaped site area.
Toronto's Green Roof Bylaw sets out a graduated green roof requirement for new development or additions that are greater than 2,000 m² in gross floor area. The requirement ranges from 20-60% of the available roof space of a building.
Green Roofs Requirements are incorporated in the Sustainability Metrics Program. For example, in MURB: Provide garden space that is equal to 25 square metres (or 250 square feet) of the rooftop or total landscaped site area. On corporate side, the city is also creating a Green Building Policy that will take into consideration green roof requirements for City buildings.