It's not necessary. In the Civil Code of People's Republic of China (PRC), the buyers of house sales contracts are husband and wife. When buying a house in full, both husband and wife must be present to sign it, because the property belongs to both husband and wife, and the buyer of the house sales contract is one of them. When buying a house in full, only one buyer needs to be present to sign it, and no spouse needs to be present. So there is no need for both husband and wife to buy a house in full. Selling a house refers to buying a commercial house from a real estate developer or other development unit, or buying a second-hand house from other real estate owners, obtaining detailed information of the house through advertisements, and deciding to buy after comparison.