To apply for a real estate certificate, you generally need: the original of the first house purchase and sale contract and the original of the supplementary contract. The original of the second unified invoice for commercial housing sales. The original survey form and stratified household floor plan of the third house. Fourth tax payment certificate Fifth Married house purchaser: 1. Copy of ID cards of both parties 2. Copy of marriage certificate; (6) Single house purchaser: 1. Copy of ID card; 2. Copy of household registration book or household registration certificate ;3. And a certificate of unmarried status issued by the Civil Affairs Bureau.