I am in the middle of completion of a Dormer Loft extension and have been informed by the builders that they have breached the part was agreement by building the dormer outside of the specifications. This means that the roof tiles will will be over the neighbours party wall. My builders say I should just modify my neighbours, who I know will not agree to this. Do I need proper legal advice? The builders are asking me to sign a disclaimer so they can carry on but I’m worried about future ramifications, for example if I want to move and it’s identified by a survey.