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Can the contract for the sale of self-built houses occupied by immigrants be valid?

The contract for the sale of self-occupied and self-built houses by immigrants is invalid.

The Regulations on Urban Real Estate Management in China stipulates that the property that has not been registered according to law and obtained the ownership certificate shall not be transferred. The contract law stipulates that the contract is invalid and has no legal binding force from the beginning. After the contract is confirmed to be invalid, the property acquired as a result of the contract shall be returned. If the contract is invalid, not only the house payment is obtained, but also the right to use the house payment, so the property value can be calculated according to the bank deposit interest rate for the same period.