Maybe you could take a picture of the 'extension' as it is now, and produce a before and after montage? Am I right in thinking the entrance to the flats is at right angles to the road? The reason your house isn't shown is because they think it won't be there for long?
Dont even go there, thats one of my biggest concerns, hence getting in BEFORE anything even gets started. Yup the entrance appears to be on the side of the building, facing our bathroom and bedrooms !! A montage, are you sure you can handle it? Here goes then.