Policy information sourced from the Hillingdon Local Plan: Part 2

DMHB 18: Private Outdoor Amenity Space

All new residential development and conversions will be required to provide good quality and useable private outdoor amenity space. Amenity space should be provided in accordance with the standards set out in Table 5.3.

Balconies should have a depth of not less than 1.5 metres and a width of not less than 2 metres.

Any ground floor and/or basement floor unit that is non-street facing should have a defensible space of not less than 3 metres in depth in front of any window to a bedroom or habitable room. However, for new developments in Conservation Areas, Areas of Special Local Character or for developments, which include Listed Buildings, the provision of private open space will be required to enhance the streetscene and the character of the buildings on the site.

The design, materials and height of any front boundary must be in keeping with the character of the area to ensure harmonisation with the existing street scene.

For more information please see the Local Plan: Part 2