This study will verify that no loss of light will occur to the surrounding buildings due to our minor development.
Our development consists of the modification of the existing Extension from a double pitched roof configuration to a flat roof configuration double storey. The top height of the extension remains the same as previously.
To clarify further, this development consists of converting the external envelope of the extensin from a double pitched roof to a flat roof. The height of the flat roof will match the height of the ridges of the existing double pitched roof. As a result, the edges of the extension are elevated, and we need to verify that no overshadowing is caused to the neighboring properties.
This study is carried out using the CGIs of the existing building and the new proposed flat roof extension. Dormer windows are added on the main building but this is for a proposed possible planning application. The dormer windows are placed in the CGI as we have already done the loss of light study for the dormer windows on the main building too. So the ones below are CGI part of a larger study. In this study we will focus only on the flat roof extension only.
The only area of concern would be the properties facing Harold Street. Therefore, the verification is carried out on these properties only. If the 45 degree rule is satisfied on all the windows of the properties facing Harold Street, then all the surrounding properties will not be affected by any overshadowing because they are much further away.
The area of most concern are the windows of the ground floor extensions of 70 Harold Street and 74 Harold Street. If those windows pass the 45-degree angle test by not touching the extension , no loss of light or overshadowing will be caused by this minor development.
This is the 45 degree test from the extension window on the ground floor of 70 Harold Street. Thi is one of the worst case scenarios for overshadowing. As this window passes the test it is expected that all the windows on the first floor will all pass the test too.
This is another one of the windows that could fail the test , however as we can see, it passes the test too. Therefore, all the remaining windows on the ground floor and first floor are all expected to pass the test.
As we can see from the pictures below, ALL the remaining windows of all the properties facing harold street pass the 45 degree angle test with a very good maring and therefore it is proven that this minor modification to the extension roof does not cause any overshadowing issues to the nearest prorprties .
Properties facing castle street
The properties facing Castle Street are at a much further distance than those facing Harold Street. Since the properties facing Harold Street passed the test, then it is very obvious the test passed for the properties facing Castle Street, which are at a much greater distance.
Horizontal study
The horizontal overshadowing is exempt since the development is not increasing the footprint of the extension or any part of the building.