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Cheers Cbde, pics help loads. Rethinking what I was planning now. Any tips for waterproofing the hole for a few months?

Plans are vague. Tying the new inner into the old inner is possible, but would involve me making a big hole in the back of the house months before it can then be made water tight again. B1,b2 and B3 are all RSJs replacing walls. Hatched line are all new walls.

Drawing shows/states centrally over the cavity of the rear wall with a 400x100mm padstone. To me that means, half on the original inner skin and half on the return section on the rear outer skin, hence my concern of separating this from the rest of the wall. If I cut the cavity out the padstone...

Hi all, I am in the process of self building a small single storey extention, currently building up to DPC. I will be using wall starters and Dom to join both (block) skins to the original back of the house, which will be completely knocked through right up to the original sides of the house...