Hello - I am currently seeking planning permission for a 2 storey side extension. I am expecting a visit next week from planning and wanted to be sure on my measurements. Next door's property has two external chimney breasts on their external wall which jut out about 35-40cms I think. When measuring from my side wall to the neighbouring detached properties side wall to get the gap between the two houses, I have disregarded these chimney breasts and measured from my wall to their main wall which therefore makes their house 35-40cm further away than if I measured only to the chimney breast wall. Hope I've made sense here! I am a bit worried now that planning will say that the gap is from my house to the wall of the chimney breast, not the main wall, which may affect our application. Just looking for some advice and thoughts. Thanks.