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Hi, sorry, only just got round to replying! I meant to say, although you probably already know - concrete shrinks as it sets, so for this reason traditionally you leave a gap of around 50mm when underpinning, and then you dry pack it - the SE should specify this. There is another method called...

And regarding damp coursing, here are a couple of possibilities. I had been considering laying in membrane sheet in the hole for underpinning (SE doesn't see a problem with it, other than fiddly, but putting pressure on concrete will make the membrane take shape of the hole). Alternatively, as...

Go for it JDLDIY - there appears to be some misconceptions that underpinning is a dark art performed by highly skilled craftsman / artisans. It is nothing more than digging a hole and filling it with (correctly mixed) concrete according to instructions. It is not for the builder/contractors to...