Normally a party wall agreement is required for basement conversions. Each neighbour will have to be informed of the proposed works using a party wall notice form at least two calendar months before the intended start of the build. The party wall agreement is there to protect you and your neighbour from issues that might arise due to work done on the party wall. It draws up an agreement between you and your neighbour on what needs to happen if there is a problem. By law your neighbour can insist you have one before the work starts. If you require assistance in this process Simply Basement can put you in contact with one of our certified party wall surveyors.