The Greater London Authority has introduced the world's first mandatory 'Urban Forest' building code, requiring all new commercial and residential developments above 10 storeys to integrate a minimum of 30 per cent green coverage across their facades and rooftops.

The code, which takes effect in January 2027, aims to combat the urban heat island effect, improve air quality, and increase biodiversity in the capital. Developers will be required to submit detailed planting plans and maintenance commitments as part of the planning process.

"London is the first major city to treat green infrastructure not as a luxury, but as a fundamental building requirement," said the Mayor of London.

The construction industry has expressed mixed reactions, with some developers warning of increased costs while others see it as a competitive advantage in attracting environmentally conscious tenants willing to pay premium rents.