See Ugly Box attached to parapet and roof.
Edit: wild that a dormer that size is apparently PD!
What council are you under? I thought PD had a limit of 40 cubic metres of additional roof space, so that must be right on the limit of that.
Looks semi-detached, so will be 50m3. That also looks like a single dormer, so likely well under that.
@andyp started
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See Ugly Box attached to parapet and roof.
Edit: wild that a dormer that size is apparently PD!