Green Roofs in London: SuDS Implementation and Developer Benefits

London’s high-density developments face rising flood risk, making sustainable drainage systems (SuDS) a planning priority. The London Plan requires new projects to manage surface water sustainably, with many boroughs mandating green roofs on major developments.

A green roof captures rainfall where it lands, easing pressure on the city’s Victorian sewers. Extensive green roofs can retain a large proportion of summer rainfall, reducing surface water runoff while improving thermal performance and biodiversity.

For developers, integrating green roofs into designs isn’t just about compliance - it can cut the cost and footprint of conventional drainage infrastructure. In addition, it supports sustainability goals and can help developments achieve greenfield runoff rates, which speeds up planning approvals.

Recent extreme rainfall events have shown the city’s vulnerability to surface water flooding. Green roofs are now part of a wider network of SuDS measures, including rain gardens and permeable paving, being used to improve urban resilience. For developers in London, they offer a way to meet strict planning targets, reduce long-term costs, and add visual and environmental value to a project.

Contact SUDS Designs by JMS Engineers today to speak with our team about your next project.