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Howard-
https://goo.gl/maps/A1gnUi1KJV6rYFnU7
Edit: looking at that^, it looks like they've even built up the party wall so they could go even higher
dt
Is this taking the piss in regard to permitted development and 'No part of the extension to be higher than the highest part of the existing roof'
They've raised the original roofline to the height of the party walls (which also increased the steepness of the road facing roof)