So i have a parking space out the back of my property (separated by a path and stairs down to road level) and i'm wanting to build a garage on it. Lots of the other spaces have already had garages built including the space directly next to us. their garage is 3.6 metres wide which leaves us with 3 metres of parking space to build on, we were happy to do this if we can have a party wall, using their side of the garage as one of our walls and building 3 extra etc. They originally agreed to this but have now stopped us from doing it saying that they don't want ours attached and we should build a separate wall. I'm in the process of trying to find out now if they've built over our boundary (it certainly looks like they have) This is my first house and i thought anything to do with property was very precise, that's obviously not the case as I've spoken to land registry who basically say the boundary line can't really be determined by any measurement. Apparently they've had this garage their for 20 years and had planning permission at the time, does this leave me a leg to stand on? from my research i've found that anyone occupying some land for 12 years or more can claim ownership of it? Seems ridiculous that my best option is to just suck it and build a smaller garage as they've basically stolen part of our land. I'm going home to measure in a minute but from the deeds it looks like our parking space boundary is directly in line with the edge of our house so i should be able to figure that our roughly. I've also left a voicemail with my solicitor for some advise and am waiting for a quote from a boundary surveyor to come and have a look. Anyone dealt with anything like this before? I'm a bit lost here.