Side Extension Permitted Development Advice

[Dre4891]

Hi,

 

Would an extension towards the red arrow (see attached pic) fall under permitted development or would that elevation be classed as fronting a highway? I've had a read through the 'PD Technical Guidance' but the section below is not clear/defined:

 

The extent to which an elevation of a house fronts a highway will depend on factors such as:
(i) the angle between the elevation of the house and the highway. If that angle is more than 45 degrees, then the elevation will not normally be considered as fronting a highway;
(ii) the distance between the house and the highway - in cases where that distance is substantial, it is unlikely that a building can be said to front the highway. The same may be true where there is a significant intervening area of land in different ownership or use between the boundary of the curtilage of the house concerned and the highway.

 

What is classed as a substantial distance? The distance between the 'original' house and highway is roughly 18m.

 

Thanks for any help.

[DevilDamo]

https://forum.buildhub.org.uk/topic/40874-bungalow-permitted-development-advice/