To obtain an agreement in principle, you must provide a large amount of personal information. In addition, it is important that the information you provide is correct, as this information “in principle” forms the basis of the lender`s mortgage offer and may lead to a complete withdrawal or modification of the offer. You can request an agreement in principle with any mortgage lender. It`s not necessarily your current bank. An AIP is normally free of charge. The purpose of an agreement in principle is to give the lender an initial and timely guarantee of its willingness to lend. It is about communicating solid facts about the applicant`s personal circumstances. .