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Hi Thank you for your question and welcome. My name is ***** ***** I will assist you. You do not need to sell the property with 3rd party wall agreements in place. This can be done by whoever arranges to do the works. If you are not doing the work your self you will not actually know what will need to go in the agreement or what you are obtaining consent for, so this agreement should be made up once the prospective decides what work they will actually need to do. Kind regards AJ