I just want to pick up the toilet waste and consolidate the rest and get it out of the way of a potential extension but leave the vent part of it where is. It may look a bit odd but you won’t see it
Its should be ok, but if you're desperate to move the stack, move the lot over, and continue straight up to vent in the new position, with the branch going across to the WC. Dog leg around the eaves with the vent and make good the roof at the old position.
Any scope to box the stack in through the extension in its current position?
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