The London Plan download section
Sustainable energy
4A.10 Overheating
The Mayor will, and boroughs should strongly encourage development that
avoids internal overheating and excessive heat generation and contributes to
the prevention of further over-heating, especially where the urban heat island is
most intense.
Developers should demonstrate how development could be made heat
resilient in design, construction and operation. The Mayor will work with
partners to reduce the heat island effect through energy efficiency and
appropriate design.