The builders came into your garden, took your fence down. No, they should not have done that. The builders broke slabs, pots and a rose and put up black gutter instead of white - these were all done by the builders not the neighbours. Do the neighbours even know about the breakages? Were they aware the builders came into your garden? Or put the wrong colour guttering up? The neighbours may have just employed someone to do a job and got on with their own lives and not realised what the builders had done. I have men building my extension and if they smashed next door's pots but didn't tell me I wouldn't have a clue. The neighbours may be nice people but unaware you are depressed and not enjoying your garden because of these issues. Personally I would either chase the builders for compensation or, more likely, just put all that has already happened behind me and focus on the issue of the fence. If you don't want a fence against the wall then tell your neighbours you don't and make it clear they cannot come onto your land to do this - but would it really be a bad thing? It doesn't sound like they are trying to steal your land. Don't object to it just because you can, the fence might be nicer than the wall. Life is too short to make enemies when they could be friends. I would only go down the legal route as a last resort as (as others have said) you would have to declare this if you were selling your house and it will definitely create a horrible atmosphere to live in. Have a think about the fence, if you definitely don't want it go and ask the neighbours for a chat, tell them you don't want the fence and also ask for the builders contact details as you are unhappy re the breakages/guttering. Good luck and hope all works out well.