Many Local Authorities have policies that seek to ensure access to daylight and sunlight to neighbouring habitable room windows, and that sunlight to the neighbours’ principal garden is not adversely affected by a development.
Even in the absence of such a specific local policy, National Planning Policy stipulates that amenity should be considered, and thus, where your Local Council’s policies are not clear on the issues of Daylight and Sunlight, failure to assess can still lead to a neighbour challenging a planning decision if proper consideration has not been given.
The most widely recognised and used document for assessing good Daylight and Sunlight design, is “Site Layout Planning for Daylight and Sunlight – A Guide to Good Practice, 2nd Edition” by Paul Littlefair. This is a nationally recognised publication, and whilst not mandatory, it has been adopted by many design practitioners, planning consultants and Local Authority Planning Departments throughout the UK.
As a result of this, if your proposed extension does not meet the tests with this Guide (formally known and still widely referred to as BRE 209), and thus causes adverse impact to your neighbours’ home, planning permission can be refused, or, you may be asked to adapt your design to eradicate the harmful impact upon your neighbours’ property.
You may be asked to demonstrate that your design will not adversely affect your neighbour(s), by providing a Daylight and Sunlight Assessment to accompany your planning application.
If this does happen, we can help.