. It can also lead to poor detailing as owners try to get their weatherproofing right without going beyond the boundary line. The uncertainties involved can lead to a waste of materials and space, as dwellings get constructed in stages with doubled-up walls, each on its own land, with complicated foundation structures to avoid footings encroaching under the neighbours' land. The common law on party walls or separating walls is complex: the wall might belong to one side or the other, it may have its ownership split down the middle, or it may be jointly owned; and the neighbours rights and responsibilities are different in each.
It.
