1. When the buyer and the seller sign the contract, the owner's ID card and title certificate are signed at the scene. Buyer: ID card 2. The buyer and the seller handle the transfer at the Housing Authority: the seller: the original and photocopy of ID card, household registration book, marriage certificate and property right certificate 1 (if married, both husband and wife's certificates should be in place and signed by both husband and wife) The buyer: ID card 3. Real estate is the property of one spouse before marriage, and it was purchased during the marriage relationship and belongs to both spouses. Without the approval of the other party, the sale is invalid. As long as the property right is transferred, the house can only be sold if one party is present to sign it.