Hi - yes it does have an impact on our property from an aesthetic and privacy point of view and it is also very much out of proportion of similar extensions in the immediate area.

The extent of the projection of the extremely large dormer with extremely large windows is very intrusive for me and a number of others. I am very surprised that this has not warranted consultation. To the best of my knowledge the rules of permitted development rights are quite strict and I doubt if this falls within them.
I am not aware of an application for a Lawful Development Certificate being appropriate immediatley in advance of major construction and where the works are commenced before a decision is made. It does not make sense and seems that the owner is taking on quite a risk of subsequent enforcement action unecessarily.