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chrisbmx116-
Ours, even without a step-down, came to ~38m3, which is far less than the 50m3 we're allowed under PD (semi-detached).
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Very rough figures for a typical terrace dormer could be 5x4x2-ish (divided by 2 cos only half of it is new space) so about 20 cubic meters. Extra room above the outrigger 3x3x2 or 18 cubic meters.
Doesn't leave much to play with.
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It seems fairly tight.
I remember liking this design when I saw it going up. Designed to maximise the volume
https://publicregister.haringey.gov.uk/pr/s/planning-application/a0i8d000002GB7iAAG/hgy20140236?c__r=Arcus_BE_Public_Register&tabset-3892f=3
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Permitted development is maximum 40 cubic meters on terraced houses.