Policy 5.11 Green roofs and development site environs
A Major development proposals should be designed to include roof, wall and site planting, especially green roofs and walls where feasible, to deliver as many of the following objectives as possible:
a adaptation to climate change (ie aiding cooling)
b sustainable urban drainage
c mitigation of climate change (ie aiding energy efficiency)
d enhancement of biodiversity
e accessible roof space
f improvements to appearance and resilience of the building
g growing food.
B Within LDFs boroughs may wish to develop more detailed policies and proposals to support the development of green roofs and the greening of development sites. Boroughs should also promote the use of green roofs in smaller developments, renovations and extensions where feasible.
5.52 Green roofs are an essential sustainable design consideration and can take many forms in order to maximise their benefits in a given location. However, the design and operational needs of a green roof should not place undue stress on water supply and other natural resources. Vegetated roofs, including terraces and gardens, can improve the thermal performance of the building, reduce the urban heat island effect, support sustainable urban drainage by absorbing rainfall to reduce flooding, enhance biodiversity, provide amenity for residents who may not have access to private gardens, provide opportunities to grow food and improve appearance.
5.53 High quality designs for green walls incorporating vegetation over a majority of a building’s vertical surfaces should also be considered in new developments. The Mayor’s supplementary guidance on Sustainable Design and Construction contains further guidance on including green space in development proposals.