Ignoring the fact that it is one of the ugliest roof extensions I have ever seen......the flank wall of the dormer is brick and the rear wall of the dormer is tile hanging. That alone would take it outside of PD in my humble opinion. The dormer finish should be of a similar material to the roof covering.
I wonder if you could clad the brickwork flank wall in tile hanging to bring it back within PD (assuming the total volume of the dormer is OK)?
it’s either PD or it ain’t allowed simple.
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