Entrusting an agency to handle the purchase and sale of houses requires both husband and wife to express their opinions, and prepare materials such as dual ID cards, household registration books, marriage certificates, house ownership certificates, land use certificates and so on. In addition, it is necessary to obtain the consent of the principal in advance to provide the identity card materials of the principal. The notary office should submit an application for entrustment notarization, and the notary will be ready to entrust his family to buy a house. The notary told the reporter that it is necessary to provide the couple's ID card, household registration book, marriage certificate (single person provides single certificate), the client's ID card and the basic materials of the house purchased, that is, the copy of the house ownership certificate, the commercial housing sales contract, and the subscription book.