Pretty sure end of terrace is still classed as a terrace. The volume is additional space created so not including existing roof volume but if you have existing additions (i.e. A former owner added something) that does need to be included.
Cheers, that's what I suspected but wasn't really sure.
Time to get measuring (even though it's probably not for another 5 years or so).
We ended up with dutch gables to squeeze under the limit
@aggi started
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Pretty sure end of terrace is still classed as a terrace. The volume is additional space created so not including existing roof volume but if you have existing additions (i.e. A former owner added something) that does need to be included.