Hi, last year my neighbours constructed a monstrosity of a lean to down the side of their house with a centimetre between it and my house wall. At the time, my mother was in and spoke to them (she lives with me) and they assured her it was all fine and they'd checked permissions, etc. As we have a good relationship with them, we didn't see any reason to raise objections at that time. The lean to very narrowly (like I said, barely a centimetre) doesn't touch our property. However, if we wanted to get the wall repointed, there is zero access to it.
Recently, the bad weather and excessive rain has caused significant damp down that side of the wall where we've never had it before. And when examining during a rain storm, the lean to is directing a flow of water towards that wall. I got a builder in to examine and he climbed over to have a look - his assessment was that the lean to was causing excessive water to hit that wall and cause the damp.
Can you advise me of the best way to go about dealing with this? Having spoken to the neighbours, it's clear they are not interested in helping - they have just stood firm that they have a right to put it there and that's that. I called the council and they weren't very helpful, so I think the next port of call is my insurance company, but I would be interested if anyone has any knowledge of the legalities of lean tos and how the boundaries work.