Surely the only sensible solution would be to build your side up to the party wall then modify theirs to meet you in the middle? Accepting that sensible in this case means not particularly feasible and therefore not worth pursuing
Yeah, that’s what makes sense in my mind but they are worried about having a gap and want to insist we join with no gap.
If we can afford a proper brick wall I’d go with that but it’s unlikely.
Surely the only sensible solution would be to build your side up to the party wall then modify theirs to meet you in the middle? Accepting that sensible in this case means not particularly feasible and therefore not worth pursuing