Ask an Property Solicitor. Get an Answer ASAP.
Hello, my name is***** hope you are well today. I am a qualified Solicitor, and I will be able to help you by providing you with an answer to your question today. I specialise in UK and Irish Law. I am not always online but rest assured if I do not respond immediately I will respond when I return.
Is there anything else you feel is relevant to your question or anything else you would like to add before we continue?
May I know who owns the boundary fence? If the fence is owned by them, then yes, it is allowed for them to change it. However, if the fence was owned by you, then you must contact your local authority about this matter.
Have you reached out to your neighbour about this issue?
It would be advisable to instruct an surveyor to provide a report. Thereafter if they agree you can then take enforcement steps.
I am always available to help and please do let me know if you have any other questions I can answer for you.