I know the Party Wall Act does not apply in Scotland and that things are done differently here because that's what every single online search result I get tells me immediately before not saying what those differences are or linking to them and immediately going on to discuss the E&W Party Wall Act in detail. Whether my google-fu is weak or search is just enshittified nonsense now I can't wrestle any more than that out of it. Does anyone happen to know what if any legislation *does* apply here? I have a useless little part of my garden that sits between me and my neighbour's extensions that I'd like to make into an enclosed porch with a mini lean-to conservatory, but that will require at minimum a few bits of silicone sealant on their extension wall(based on both deeds and my own comparative measurements their extension wall is built running *on* the property line, not merely facing up against it) and sticking some butyl tape to their guttering, so while I fully intend to take the idea to them for discussion and come to a reasonable accord rather than just spring it on them as a fait accompli, it'd still be useful to know if I have any legal rights or legs to stand on. 

Add "Scottish Building Regulations" to your search. Get information like this from source. Then you actually know what is correct or otherwise.

4 hours ago, JohnMo said:

Add "Scottish Building Regulations" to your search. Get information like this from source. Then you actually know what is correct or otherwise.

Alas I'd already tried that and my original issue stands - any inclusion of the phrase "party wall" almost exclusively returns results concerned with the Party Wall Act and the fact it doesn't apply here, and even using quotes just sprinkles in a few links mentioning the fact the scottish building regs exist. As far as I can tell from checking them directly, having done so previously, the regs only mention the concept specifically in relation to not undermining the structural integrity of the building, and in terms of requirements for fire resistance. There are mentions of *boundary* walls, but those explicitly refer to walls external to the house constructed along property lines eg garden walls, not part of the structure. I can't find any info on what processes, if any, actually govern situations like "I want to attach something to an external wall that is also a party wall wot do?".