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Hi, if it is a shared boundary fence, you should get the consent of your neighbour before you alter it. This is because you are both jointly liable for maintaining it. As you intend paying, I would certainly hope that your neighbour does not object. If you do proceed without his consent, he could, in theory, take civil action against you- but would involve him taking Court action which is probably highly unlikely bearing in mind the potential legal costs it would cost him! I hope this helps and if so, I would be grateful if you could rate my answer. Kind Regards Al