• Oh okay - so actually seems the main constraint is how your extension will adjoin theirs. Party wall, gutters, flashing etc. I’m sure your architect is across all that. The gable pitch makes more sense in that case to me as the low point on the party wall will become a valley gutter flashed into their extension flank wall. For a flat roof you would need a parapet to master their roof - and that will all end up too high . Probably . If I understand it right.

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