Sunlight to gardens and open spaces

The BRE guide recommends that no more than two-fifths and preferably no more than one quarter of any
garden or other amenity area should be prevented from receiving any sunlight at all on 21st March.

We use computer modelling techniques to trace the path of the sun on 21st March and identify areas of
an open space which will be in permanent shadow.


Diffuse daylighting to windows
Sunlight availability to windows